Updated on 2024-05-07 GMT+08:00

Other System Functions

  • Built-in functions and operators of GaussDB are compatible with PostgreSQL.

    _pg_char_max_length

    _pg_char_octet_length

    _pg_datetime_precision

    _pg_expandarray

    _pg_index_position

    _pg_interval_type

    _pg_numeric_precision

    _pg_numeric_precision_radix

    _pg_numeric_scale

    _pg_truetypid

    _pg_truetypmod

    q

    abs

    abstime

    abstimeeq

    abstimege

    abstimegt

    abstimein

    abstimele

    abstimelt

    abstimene

    abstimeout

    abstimerecv

    abstimesend

    aclcontains

    acldefault

    aclexplode

    aclinsert

    aclitemeq

    aclitemin

    aclitemout

    aclremove

    acos

    age

    akeys

    any_in

    any_out

    anyarray_in

    anyarray_out

    anyarray_recv

    anyarray_send

    anyelement_in

    anyelement_out

    anyenum_in

    anyenum_out

    anynonarray_in

    anynonarray_out

    anyrange_in

    anyrange_out

    anytextcat

    area

    areajoinsel

    areasel

    array_agg

    array_agg_finalfn

    array_agg_transfn

    array_append

    array_cat

    array_dims

    array_eq

    array_fill

    array_ge

    array_gt

    array_in

    array_larger

    array_le

    array_length

    array_lower

    array_lt

    array_ndims

    array_ne

    array_out

    array_prepend

    array_recv

    array_send

    array_smaller

    array_to_json

    array_to_string

    array_typanalyze

    array_upper

    arraycontained

    arraycontains

    arraycontjoinsel

    arraycontsel

    arrayoverlap

    ascii

    asin

    atan

    atan2

    avals

    avg

    big5_to_euc_tw

    big5_to_mic

    big5_to_utf8

    bit

    bit_and

    bit_in

    bit_length

    bit_or

    bit_out

    bit_recv

    bit_send

    bitand

    bitcat

    bitcmp

    biteq

    bitge

    bitgt

    bitle

    bitlt

    bitne

    bitnot

    bitor

    bitshiftleft

    bitshiftright

    bittypmodin

    bittypmodout

    bitxor

    bool

    bool_and

    bool_or

    booland_statefunc

    booleq

    boolge

    boolgt

    boolin

    boolle

    boollt

    boolne

    boolor_statefunc

    boolout

    boolrecv

    boolsend

    box

    box_above

    box_above_eq

    box_add

    box_below

    box_below_eq

    box_center

    box_contain

    box_contain_pt

    box_contained

    box_distance

    box_div

    box_eq

    box_ge

    box_gt

    box_in

    box_intersect

    box_le

    box_left

    box_lt

    box_mul

    box_out

    box_overabove

    box_overbelow

    box_overlap

    box_overleft

    box_overright

    box_recv

    box_right

    box_same

    box_send

    box_sub

    bpchar

    bpchar_larger

    bpchar_pattern_ge

    bpchar_pattern_gt

    bpchar_pattern_le

    bpchar_pattern_lt

    bpchar_smaller

    bpchar_sortsupport

    bpcharcmp

    bpchareq

    bpcharge

    bpchargt

    bpchariclike

    bpcharicnlike

    bpcharicregexeq

    bpcharicregexne

    bpcharin

    bpcharle

    bpcharlike

    bpcharlt

    bpcharne

    bpcharnlike

    bpcharout

    bpcharrecv

    bpcharregexeq

    bpcharregexne

    bpcharsend

    bpchartypmodin

    bpchartypmodout

    broadcast

    btabstimecmp

    btarraycmp

    btbeginscan

    btboolcmp

    btbpchar_pattern_cmp

    btbuild

    btbuildempty

    btbulkdelete

    btcanreturn

    btcharcmp

    btcostestimate

    btendscan

    btfloat48cmp

    btfloat4cmp

    btfloat4sortsupport

    btfloat84cmp

    btfloat8cmp

    btfloat8sortsupport

    btgetbitmap

    btgettuple

    btinsert

    btint24cmp

    btint28cmp

    btint2cmp

    btint2sortsupport

    btint42cmp

    btint48cmp

    btint4cmp

    btint4sortsupport

    btint82cmp

    btint84cmp

    btint8cmp

    btint8sortsupport

    btmarkpos

    btnamecmp

    btnamesortsupport

    btoidcmp

    btoidsortsupport

    btoidvectorcmp

    btoptions

    btrecordcmp

    btreltimecmp

    btrescan

    btrestrpos

    btrim

    bttext_pattern_cmp

    bttextcmp

    bttextsortsupport

    bttidcmp

    bttintervalcmp

    btvacuumcleanup

    bytea_sortsupport

    bytea_string_agg_finalfn

    bytea_string_agg_transfn

    byteacat

    byteacmp

    byteaeq

    byteage

    byteagt

    byteain

    byteale

    bytealike

    bytealt

    byteane

    byteanlike

    byteaout

    bytearecv

    byteasend

    cash_cmp

    cash_div_cash

    cash_div_flt4

    cash_div_flt8

    cash_div_int2

    cash_div_int4

    cash_div_int8

    cash_eq

    cash_ge

    cash_gt

    cash_in

    cash_le

    cash_lt

    cash_mi

    cash_mul_flt4

    cash_mul_flt8

    cash_mul_int2

    cash_mul_int4

    cash_mul_int8

    cash_ne

    cash_out

    cash_pl

    cash_recv

    cash_send

    cashlarger

    cashsmaller

    cbrt

    ceil

    ceiling

    center

    char

    char_length

    character_length

    chareq

    charge

    chargt

    charin

    charle

    charlt

    charne

    charout

    charrecv

    charsend

    chr

    cideq

    cidin

    cidout

    cidr

    cidr_in

    cidr_out

    cidr_recv

    cidr_send

    cidrecv

    cidsend

    circle

    circle_above

    circle_add_pt

    circle_below

    circle_center

    circle_contain

    circle_contain_pt

    circle_contained

    circle_distance

    circle_div_pt

    circle_eq

    circle_ge

    circle_gt

    circle_in

    circle_le

    circle_left

    circle_lt

    circle_mul_pt

    circle_ne

    circle_out

    circle_overabove

    circle_overbelow

    circle_overlap

    circle_overleft

    circle_overright

    circle_recv

    circle_right

    circle_same

    circle_send

    circle_sub_pt

    clock_timestamp

    close_lb

    close_ls

    close_lseg

    close_pb

    close_pl

    close_ps

    close_sb

    close_sl

    col_description

    concat

    concat_ws

    contjoinsel

    contsel

    convert

    convert_from

    convert_to

    corr

    cos

    cot

    count

    covar_pop

    covar_samp

    cstring_in

    cstring_out

    cstring_recv

    cstring_send

    cume_dist

    current_database

    current_query

    current_schema

    xpath_exists

    current_setting

    current_user

    currtid

    currtid2

    currval

    cursor_to_xml

    cursor_to_xmlschema

    database_to_xml

    database_to_xml_and_xmlschema

    database_to_xmlschema

    date

    date_cmp

    date_cmp_timestamp

    date_cmp_timestamptz

    date_eq

    date_eq_timestamp

    date_eq_timestamptz

    date_ge

    date_ge_timestamp

    date_ge_timestamptz

    date_gt

    date_gt_timestamp

    date_gt_timestamptz

    date_in

    date_larger

    date_le

    date_le_timestamp

    date_le_timestamptz

    date_lt

    date_lt_timestamp

    date_lt_timestamptz

    date_mi

    date_mi_interval

    date_mii

    date_ne

    date_ne_timestamp

    date_ne_timestamptz

    date_out

    date_pl_interval

    date_pli

    date_recv

    date_send

    date_smaller

    date_sortsupport

    daterange_canonical

    daterange_subdiff

    datetime_pl

    datetimetz_pl

    dcbrt

    decode

    defined

    degrees

    delete

    dense_rank

    dexp

    diagonal

    diameter

    dispell_init

    dispell_lexize

    dist_cpoly

    dist_lb

    dist_pb

    dist_pc

    dist_pl

    dist_ppath

    dist_ps

    dist_sb

    dist_sl

    div

    dlog1

    dlog10

    domain_in

    domain_recv

    dpow

    dround

    dsimple_init

    dsimple_lexize

    dsnowball_init

    dsnowball_lexize

    dsqrt

    dsynonym_init

    dsynonym_lexize

    dtrunc

    each

    enum_ne

    enum_out

    enum_range

    enum_recv

    enum_send

    enum_smaller

    eqjoinsel

    eqsel

    euc_cn_to_mic

    euc_cn_to_utf8

    euc_jis_2004_to_shift_jis_2004

    euc_jis_2004_to_utf8

    euc_jp_to_mic

    euc_jp_to_sjis

    euc_jp_to_utf8

    euc_kr_to_mic

    euc_kr_to_utf8

    euc_tw_to_big5

    euc_tw_to_mic

    euc_tw_to_utf8

    every

    exist

    exists_all

    exists_any

    exp

    factorial

    family

    fdw_handler_in

    fdw_handler_out

    fetchval

    first_value

    float4

    float4_accum

    float48div

    float48eq

    float48ge

    float48gt

    float48le

    float48lt

    float48mi

    float48mul

    float48ne

    float48pl

    float4abs

    float4div

    float4eq

    float4ge

    float4gt

    float4in

    float4larger

    float4le

    float4lt

    float4mi

    float4mul

    float4ne

    float4out

    float4pl

    float4recv

    float4send

    float4smaller

    float4um

    float4up

    float8

    float8_accum

    float8_avg

    float8_collect

    float8_corr

    float8_covar_pop

    float8_covar_samp

    float8_regr_accum

    float8_regr_avgx

    float8_regr_avgy

    float8_regr_collect

    float8_regr_intercept

    float8_regr_r2

    float8_regr_slope

    float8_regr_sxx

    float8_regr_sxy

    float8_regr_syy

    float8_stddev_pop

    float8_stddev_samp

    float8_var_pop

    float8_var_samp

    float84div

    float84eq

    float84ge

    float84gt

    float84le

    float84lt

    float84mi

    float84mul

    float84ne

    float84pl

    float8abs

    float8div

    float8eq

    float8ge

    float8gt

    float8in

    float8larger

    float8le

    float8lt

    float8mi

    float8mul

    float8ne

    float8out

    float8pl

    float8recv

    float8send

    float8smaller

    float8um

    float8up

    floor

    flt4_mul_cash

    flt8_mul_cash

    fmgr_c_validator

    fmgr_internal_validator

    fmgr_sql_validator

    format

    format_type

    gb18030_to_utf8

    gbk_to_utf8

    generate_series

    generate_subscripts

    get_bit

    get_byte

    get_current_ts_config

    get_global_gs_asp

    get_large_table_name

    -

    -

    -

    gtsquery_compress

    gtsquery_consistent

    gtsquery_decompress

    gtsquery_penalty

    gtsquery_picksplit

    gtsquery_same

    gtsquery_union

    gtsvector_compress

    gtsvector_consistent

    gtsvector_decompress

    gtsvector_penalty

    gtsvector_picksplit

    gtsvector_same

    gtsvector_union

    gtsvectorin

    gtsvectorout

    has_tablespace_privilege

    has_type_privilege

    hash_aclitem

    hashbeginscan

    hashbuild

    hashbuildempty

    hashbulkdelete

    hashcostestimate

    hashendscan

    hashgetbitmap

    hashgettuple

    hashinsert

    hashint2vector

    hashint4

    hashint8

    hashmacaddr

    hashmarkpos

    hashname

    hashoid

    hashoidvector

    hashoptions

    hashrescan

    hashrestrpos

    hashtext

    hashvacuumcleanup

    hashvarlena

    host

    hostmask

    iclikejoinsel

    iclikesel

    icnlikejoinsel

    icnlikesel

    icregexeqjoinsel

    icregexeqsel

    icregexnejoinsel

    icregexnesel

    inet_client_addr

    inet_client_port

    inet_in

    inet_out

    inet_recv

    inet_send

    inet_server_addr

    inet_server_port

    inetand

    inetmi

    inetmi_int8

    inetnot

    inetor

    inetpl

    initcap

    int2_accum

    int2_avg_accum

    int2_mul_cash

    int2_sum

    int24div

    int24eq

    int24ge

    int24gt

    int24le

    int24lt

    int24mi

    int24mul

    int24ne

    int24pl

    int28div

    int28eq

    int28ge

    int28gt

    int28le

    int28lt

    int28mi

    int28mul

    int28ne

    int28pl

    int2abs

    int2and

    int2div

    int2eq

    int2ge

    int2gt

    int2in

    int2larger

    int2le

    int2lt

    int2mi

    int2mod

    int2mul

    int2ne

    int2not

    int2or

    int2out

    int2pl

    int2recv

    int2send

    int2shl

    int2shr

    int2smaller

    int2um

    int2up

    int2vectoreq

    int2vectorin

    int2vectorout

    int2vectorrecv

    int2vectorsend

    int2xor

    int4_accum

    int4_avg_accum

    int4_mul_cash

    int4_sum

    int42div

    int42eq

    int42ge

    int42gt

    int42le

    int42lt

    int42mi

    int42mul

    int42ne

    int42pl

    int48div

    int48eq

    int48ge

    int48gt

    int48le

    int48lt

    int48mi

    int48mul

    int48ne

    int48pl

    int4abs

    int4and

    int4div

    int4eq

    int4ge

    int4gt

    int4in

    int4inc

    int4larger

    int4le

    int4lt

    int4mi

    int4mod

    int4mul

    int4ne

    int4not

    int4or

    int4out

    int4pl

    int4range

    int4range_canonical

    int4range_subdiff

    int4recv

    int4send

    int4shl

    int4shr

    int4smaller

    int4um

    int4up

    int4xor

    int8

    int8_avg

    int8_avg_accum

    int8_avg_collect

    int8_mul_cash

    int8_sum

    int8_sum_to_int8

    int8+1635:1668_accum

    int82div

    int82eq

    int82ge

    int82gt

    int82le

    int82lt

    int82mi

    int82mul

    int82ne

    int82pl

    int84div

    int84eq

    int84ge

    int84gt

    int84le

    int84lt

    int84mi

    int84mul

    int84ne

    int84pl

    int8abs

    int8and

    int8div

    int8eq

    int8ge

    int8gt

    int8in

    int8inc

    int8inc_any

    int8inc_float8_float8

    int8larger

    int8le

    int8lt

    int8mi

    int8mod

    int8mul

    int8ne

    int8not

    int8or

    int8out

    int8pl

    int8pl_inet

    int8range

    int8range_canonical

    int8range_subdiff

    int8recv

    int8send

    int8shl

    int8shr

    int8smaller

    int8um

    int8up

    int8xor

    integer_pl_date

    inter_lb

    inter_sb

    inter_sl

    internal_in

    internal_out

    interval

    interval_accum

    interval_avg

    interval_cmp

    interval_collect

    interval_div

    interval_eq

    interval_ge

    interval_gt

    interval_hash

    interval_in

    interval_larger

    interval_le

    interval_lt

    interval_mi

    interval_mul

    interval_ne

    interval_out

    interval_pl

    interval_pl_date

    interval_pl_time

    interval_pl_timestamp

    interval_pl_timestamptz

    interval_pl_timetz

    interval_recv

    interval_send

    interval_smaller

    interval_transform

    interval_um

    intervaltypmodin

    intervaltypmodout

    intinterval

    isexists

    ishorizontal

    iso_to_koi8r

    iso_to_mic

    iso_to_win1251

    iso_to_win866

    iso8859_1_to_utf8

    iso8859_to_utf8

    isparallel

    isperp

    isvertical

    johab_to_utf8

    jsonb_in

    jsonb_out

    jsonb_recv

    jsonb_send

    -

    -

    -

    json_in

    json_out

    json_recv

    json_send

    justify_days

    justify_hours

    justify_interval

    koi8r_to_iso

    koi8r_to_mic

    koi8r_to_utf8

    koi8r_to_win1251

    koi8r_to_win866

    koi8u_to_utf8

    language_handler_in

    language_handler_out

    latin1_to_mic

    latin2_to_mic

    latin2_to_win1250

    latin3_to_mic

    latin4_to_mic

    like_escape

    likejoinsel

    likesel

    line

    line_distance

    line_eq

    line_horizontal

    line_in

    line_interpt

    line_intersect

    line_out

    line_parallel

    line_perp

    line_recv

    line_send

    line_vertical

    ln

    lo_close

    lo_creat

    lo_create

    lo_export

    lo_import

    lo_lseek

    lo_open

    lo_tell

    lo_truncate

    lo_unlink

    log

    loread

    lower

    lower_inc

    lower_inf

    lowrite

    lpad

    lseg

    lseg_center

    lseg_distance

    lseg_eq

    lseg_ge

    lseg_gt

    lseg_horizontal

    lseg_in

    lseg_interpt

    lseg_intersect

    lseg_le

    lseg_length

    lseg_lt

    lseg_ne

    lseg_out

    lseg_parallel

    lseg_perp

    lseg_recv

    lseg_send

    lseg_vertical

    ltrim

    macaddr_and

    macaddr_cmp

    macaddr_eq

    macaddr_ge

    macaddr_gt

    macaddr_in

    macaddr_le

    macaddr_lt

    macaddr_ne

    macaddr_not

    macaddr_or

    macaddr_out

    macaddr_recv

    macaddr_send

    makeaclitem

    masklen

    max

    md5

    The MD5 encryption algorithm has lower security and poses security risks. Therefore, you are advised to use a more secure encryption algorithm.

    mic_to_big5

    mic_to_euc_cn

    mic_to_euc_jp

    mic_to_euc_kr

    mic_to_euc_tw

    mic_to_iso

    mic_to_koi8r

    mic_to_latin1

    mic_to_latin2

    mic_to_latin3

    mic_to_latin4

    mic_to_sjis

    mic_to_win1250

    mic_to_win1251

    mic_to_win866

    min

    mktinterval

    money

    mul_d_interval

    name

    nameeq

    namege

    namegt

    nameiclike

    nameicnlike

    nameicregexeq

    nameicregexne

    namein

    namele

    namelike

    namelt

    namene

    namenlike

    nameout

    namerecv

    nameregexeq

    nameregexne

    namesend

    neqjoinsel

    neqsel

    network_cmp

    network_eq

    network_ge

    network_gt

    network_le

    network_lt

    network_ne

    network_sub

    network_subeq

    network_sup

    network_supeq

    nlikejoinsel

    nlikesel

    numeric

    numeric_abs

    numeric_accum

    numeric_add

    numeric_avg

    numeric_avg_accum

    numeric_avg_collect

    numeric_cmp

    numeric_collect

    numeric_div

    numeric_div_trunc

    numeric_eq

    numeric_exp

    numeric_fac

    numeric_ge

    numeric_gt

    numeric_in

    numeric_inc

    numeric_larger

    numeric_le

    numeric_ln

    numeric_log

    numeric_lt

    numeric_mod

    numeric_mul

    numeric_ne

    numeric_out

    numeric_power

    numeric_recv

    numeric_send

    numeric_smaller

    numeric_sortsupport

    numeric_sqrt

    numeric_stddev_pop

    numeric_stddev_samp

    numeric_sub

    numeric_transform

    numeric_uminus

    numeric_uplus

    numeric_var_pop

    numeric_var_samp

    numerictypmodin

    numerictypmodout

    numrange_subdiff

    oid

    oideq

    oidge

    oidgt

    oidin

    oidlarger

    oidle

    oidlt

    oidne

    oidout

    oidrecv

    oidsend

    oidsmaller

    oidvectoreq

    oidvectorge

    oidvectorgt

    oidvectorin

    oidvectorle

    oidvectorlt

    oidvectorne

    oidvectorout

    oidvectorrecv

    oidvectorsend

    oidvectortypes

    on_pb

    on_pl

    on_ppath

    on_ps

    on_sb

    on_sl

    opaque_in

    opaque_out

    ordered_set_transition

    overlaps

    overlay

    path

    path_add

    path_add_pt

    path_center

    path_contain_pt

    path_distance

    path_div_pt

    path_in

    path_inter

    path_length

    path_mul_pt

    path_n_eq

    path_n_ge

    path_n_gt

    path_n_le

    path_n_lt

    path_npoints

    path_out

    path_recv

    path_send

    path_sub_pt

    percentile_cont

    percentile_cont_float8_final

    percentile_cont_interval_final

    pg_char_to_encoding

    pg_cursor

    pg_encoding_max_length

    pg_encoding_to_char

    pg_extension_config_dump

    -

    -

    pg_node_tree_in

    pg_node_tree_out

    pg_node_tree_recv

    pg_node_tree_send

    pg_prepared_statement

    pg_prepared_xact

    pg_notify

    pg_stat_get_wal_receiver

    pg_show_all_settings

    pg_stat_get_bgwriter_stat_reset_time

    pg_stat_get_buf_fsync_backend

    pg_stat_get_checkpoint_sync_time

    pg_stat_get_checkpoint_write_time

    pg_stat_get_db_blk_read_time

    pg_stat_get_db_blk_write_time

    pg_stat_get_db_conflict_all

    pg_stat_get_db_conflict_bufferpin

    pg_stat_get_db_conflict_snapshot

    pg_stat_get_db_conflict_startup_deadlock

    pg_switch_xlog

    xpath

    pg_timezone_abbrevs

    pg_timezone_names

    pgxc_node_str

    plpgsql_call_handler

    plpgsql_inline_handler

    plpgsql_validator

    point_above

    point_add

    point_below

    point_distance

    point_div

    point_eq

    point_horiz

    point_in

    point_left

    point_mul

    point_ne

    point_out

    point_recv

    point_right

    point_send

    point_sub

    point_vert

    poly_above

    poly_below

    poly_center

    poly_contain

    poly_contain_pt

    poly_contained

    poly_distance

    poly_in

    poly_left

    poly_npoints

    poly_out

    poly_overabove

    poly_overbelow

    poly_overlap

    poly_overleft

    poly_overright

    poly_recv

    poly_right

    poly_same

    poly_send

    polygon

    position

    positionjoinsel

    positionsel

    postgresql_fdw_validator

    pow

    power

    prsd_end

    prsd_headline

    prsd_lextype

    prsd_nexttoken

    prsd_start

    pt_contained_circle

    pt_contained_poly

    query_to_xml

    query_to_xml_and_xmlschema

    query_to_xmlschema

    quote_ident

    quote_literal

    quote_nullable

    radians

    radius

    random

    range_adjacent

    range_after

    range_before

    range_cmp

    range_contained_by

    range_contains

    range_contains_elem

    range_eq

    range_ge

    range_gt

    range_in

    range_intersect

    range_le

    range_lt

    range_minus

    range_ne

    range_out

    range_overlaps

    range_overleft

    range_overright

    range_recv

    range_send

    range_typanalyze

    range_union

    rank

    record_eq

    record_ge

    record_gt

    record_in

    record_le

    record_lt

    record_ne

    record_out

    record_recv

    record_send

    regclass

    regclassin

    regclassout

    regclassrecv

    regclasssend

    regconfigin

    regconfigout

    regconfigrecv

    regconfigsend

    regdictionaryin

    regdictionaryout

    regdictionaryrecv

    regdictionarysend

    regexeqjoinsel

    regexeqsel

    regexnejoinsel

    regexnesel

    regexp_matches

    regexp_replace

    regexp_split_to_array

    regexp_split_to_table

    regoperatorin

    regoperatorout

    regoperatorrecv

    regoperatorsend

    regoperin

    regoperout

    regoperrecv

    regopersend

    regprocedurein

    regprocedureout

    regprocedurerecv

    regproceduresend

    regprocin

    regprocout

    regprocrecv

    regprocsend

    regr_avgx

    regr_avgy

    regr_count

    regr_intercept

    regr_r2

    regr_slope

    regr_sxx

    regr_sxy

    regr_syy

    regtypein

    regtypeout

    regtyperecv

    regtypesend

    reltime

    reltimeeq

    reltimege

    reltimegt

    reltimein

    reltimele

    reltimelt

    reltimene

    reltimeout

    reltimerecv

    reltimesend

    repeat

    replace

    reverse

    RI_FKey_cascade_del

    RI_FKey_cascade_upd

    RI_FKey_check_ins

    RI_FKey_check_upd

    RI_FKey_noaction_del

    RI_FKey_noaction_upd

    RI_FKey_restrict_del

    RI_FKey_restrict_upd

    RI_FKey_setdefault_del

    RI_FKey_setdefault_upd

    RI_FKey_setnull_del

    RI_FKey_setnull_upd

    right

    round

    row_number

    row_to_json

    rpad

    rtrim

    scalargtjoinsel

    scalargtsel

    scalarltjoinsel

    scalarltsel

    schema_to_xml

    schema_to_xml_and_xmlschema

    schema_to_xmlschema

    session_user

    set_bit

    set_byte

    set_config

    set_masklen

    shift_jis_2004_to_euc_jis_2004

    shift_jis_2004_to_utf8

    sjis_to_euc_jp

    sjis_to_mic

    sjis_to_utf8

    smgrin

    smgrout

    spg_kd_choose

    spg_kd_config

    spg_kd_inner_consistent

    spg_kd_picksplit

    spg_quad_choose

    spg_quad_config

    spg_quad_inner_consistent

    spg_quad_leaf_consistent

    spg_quad_picksplit

    spg_text_choose

    spg_text_config

    spg_text_inner_consistent

    spg_text_leaf_consistent

    spg_text_picksplit

    spgbeginscan

    spgbuild

    spgbuildempty

    spgbulkdelete

    spgcanreturn

    spgcostestimate

    spgendscan

    spggetbitmap

    spggettuple

    spginsert

    spgmarkpos

    spgoptions

    spgrescan

    spgrestrpos

    spgvacuumcleanup

    stddev

    stddev_pop

    stddev_samp

    string_agg

    string_agg_finalfn

    string_agg_transfn

    strip

    sum

    suppress_redundant_updates_trigger

    table_to_xml

    table_to_xml_and_xmlschema

    table_to_xmlschema

    tan

    text

    text_ge

    text_gt

    text_larger

    text_le

    text_lt

    text_pattern_ge

    text_pattern_gt

    text_pattern_le

    text_pattern_lt

    text_smaller

    textanycat

    textcat

    texteq

    texticlike

    texticnlike

    texticregexeq

    texticregexne

    textin

    textlike

    textne

    textnlike

    textout

    textrecv

    textregexeq

    textregexne

    textsend

    thesaurus_init

    thesaurus_lexize

    tideq

    tidge

    tidgt

    tidin

    tidlarger

    tidle

    tidlt

    tidne

    tidout

    tidrecv

    tidsend

    tidsmaller

    time

    time_cmp

    time_eq

    time_ge

    time_gt

    time_hash

    time_in

    time_larger

    time_le

    time_lt

    time_mi_interval

    time_mi_time

    time_ne

    time_out

    time_pl_interval

    time_recv

    time_send

    time_smaller

    time_transform

    timedate_pl

    timemi

    timepl

    timestamp

    timestamp_cmp

    timestamp_cmp_date

    timestamp_cmp_timestamptz

    timestamp_eq

    timestamp_eq_date

    timestamp_eq_timestamptz

    timestamp_ge

    timestamp_ge_date

    timestamp_ge_timestamptz

    timestamp_gt

    timestamp_gt_date

    timestamp_gt_timestamptz

    timestamp_hash

    timestamp_in

    timestamp_larger

    timestamp_le

    timestamp_le_date

    timestamp_le_timestamptz

    timestamp_lt

    timestamp_lt_date

    timestamp_lt_timestamptz

    timestamp_mi

    timestamp_mi_interval

    timestamp_ne

    timestamp_ne_date

    timestamp_ne_timestamptz

    timestamp_out

    timestamp_pl_interval

    timestamp_recv

    timestamp_send

    timestamp_smaller

    timestamp_sortsupport

    timestamp_transform

    timestamptypmodin

    timestamptypmodout

    timestamptz

    timestamptz_cmp

    timestamptz_cmp_date

    timestamptz_cmp_timestamp

    timestamptz_eq

    timestamptz_eq_date

    timestamptz_eq_timestamp

    timestamptz_ge

    timestamptz_ge_date

    timestamptz_ge_timestamp

    timestamptz_gt

    timestamptz_gt_date

    timestamptz_gt_timestamp

    timestamptz_in

    timestamptz_larger

    timestamptz_le

    timestamptz_le_date

    timestamptz_le_timestamp

    timestamptz_lt

    timestamptz_lt_date

    timestamptz_lt_timestamp

    timestamptz_mi

    timestamptz_mi_interval

    timestamptz_ne

    timestamptz_ne_date

    timestamptz_ne_timestamp

    timestamptz_out

    timestamptz_pl_interval

    timestamptz_recv

    timestamptz_send

    timestamptz_smaller

    timestamptztypmodin

    timestamptztypmodout

    timetypmodin

    timetypmodout

    timetz

    timetz_cmp

    timetz_eq

    timetz_ge

    timetz_gt

    timetz_hash

    timetz_in

    timetz_larger

    timetz_le

    timetz_lt

    timetz_mi_interval

    timetz_ne

    timetz_out

    timetz_pl_interval

    timetz_recv

    timetz_send

    timetz_smaller

    timetzdate_pl

    timetztypmodin

    timetztypmodout

    timezone (2069)

    timezone (1159)

    timezone (2037)

    timezone (2070)

    timezone (1026)

    timezone (2038)

    tintervalct

    tintervaleq

    tintervalge

    tintervalgt

    tintervalin

    tintervalle

    tintervalleneq

    tintervallenge

    tintervallengt

    tintervallenle

    tintervallenlt

    tintervallenne

    tintervallt

    tintervalne

    tintervalout

    tintervalov

    tintervalrecv

    tintervalsame

    tintervalsend

    tintervalstart

    to_ascii (1845)

    to_ascii (1847)

    to_ascii (1846)

    trigger_in

    trigger_out

    ts_match_qv

    ts_match_tq

    ts_match_tt

    ts_match_vq

    ts_rank

    ts_rank_cd

    ts_rewrite

    ts_stat

    ts_token_type

    ts_typanalyze

    tsmatchjoinsel

    tsmatchsel

    tsq_mcontained

    tsq_mcontains

    tsquery_and

    tsquery_cmp

    tsquery_eq

    tsquery_ge

    tsquery_gt

    tsquery_le

    tsquery_lt

    tsquery_ne

    tsquery_not

    tsquery_or

    tsqueryin

    tsqueryout

    tsqueryrecv

    tsquerysend

    tsrange

    tsrange_subdiff

    tstzrange

    tstzrange_subdiff

    tsvector_cmp

    tsvector_concat

    tsvector_eq

    tsvector_ge

    tsvector_gt

    tsvector_le

    tsvector_lt

    tsvector_ne

    tsvector_update_trigger

    tsvector_update_trigger_column

    tsvectorin

    tsvectorout

    tsvectorrecv

    tsvectorsend

    txid_current

    txid_current_snapshot

    txid_snapshot_in

    txid_snapshot_out

    txid_snapshot_recv

    txid_snapshot_send

    txid_snapshot_xip

    txid_snapshot_xmax

    txid_snapshot_xmin

    txid_visible_in_snapshot

    uhc_to_utf8

    unique_key_recheck

    unknownin

    unknownout

    unknownrecv

    unknownsend

    -

    utf8_to_big5

    utf8_to_euc_cn

    utf8_to_euc_jis_2004

    utf8_to_euc_jp

    utf8_to_euc_kr

    utf8_to_euc_tw

    utf8_to_gb18030

    utf8_to_gbk

    utf8_to_iso8859

    utf8_to_iso8859_1

    utf8_to_johab

    utf8_to_koi8r

    utf8_to_koi8u

    utf8_to_shift_jis_2004

    utf8_to_sjis

    utf8_to_uhc

    utf8_to_win

    uuid_cmp

    uuid_eq

    uuid_ge

    uuid_gt

    uuid_hash

    uuid_in

    uuid_le

    uuid_lt

    uuid_ne

    uuid_out

    uuid_recv

    uuid_send

    var_pop

    var_samp

    varbit

    varbit_in

    varbit_out

    varbit_recv

    varbit_send

    varbit_transform

    varbitcmp

    varbiteq

    varbitge

    varbitgt

    varbitle

    varbitlt

    varbitne

    varbittypmodin

    varbittypmodout

    varchar

    varchar_transform

    varcharin

    varcharout

    varcharrecv

    varcharsend

    varchartypmodin

    varchartypmodout

    variance

    void_in

    void_out

    void_recv

    void_send

    win_to_utf8

    win1250_to_latin2

    win1250_to_mic

    win1251_to_iso

    win1251_to_koi8r

    win1251_to_mic

    win1251_to_win866

    win866_to_iso

    win866_to_koi8r

    win866_to_mic

    win866_to_win1251

    xideq

    xideqint4

    xidin

    xidout

    xidrecv

    xidsend

    xml

    xml_in

    xml_is_well_formed

    xml_is_well_formed_content

    xml_is_well_formed_document

    xml_out

    xml_recv

    xml_send

    xmlagg

    xmlcomment

    xmlconcat2

    xmlexists

    xmlvalidate

    -

    -

    -

    The following table lists the functions used by GaussDB to implement internal system functions. You are advised not to use these functions. If you need to use them, contact Huawei technical support.

  • spread_collect

    Description: Calculates the difference between the maximum and minimum values in a certain period of time. This function is used for data collection of aggregate functions.

    Parameters: s real[], v real[]

    Return type: real[]

  • spread_final

    Description: Calculates the difference between the maximum and minimum values in a certain period of time. This function is used for the final data processing of the aggregate function.

    Parameter: s real[]

    Return type: real

  • spread_internal

    Description: Calculates the difference between the maximum and minimum values in a certain period of time. This function is used for the process of aggregate functions.

    Parameters: s real[], v real

    Return type: real[]

  • xidin4

    Description: Inputs a 4-byte xid.

    Parameter: cstring

    Return type: xid32

  • set_hashbucket_info

    Description: Sets hash bucket information.

    Parameter: text

    Return type: Boolean

  • gap_fill_internal

    Description: Returns the first non-NULL value in the parameter list.

    Parameter: s anyelement, v anyelement

    Return type: anyelement

  • int1send

    Description: Packs unsigned 1-byte integers into the internal data buffer stream.

    Parameter: tinyint

    Return type: bytea

  • is_contain_namespace

    Description: Searches for the table name and namespace split location. If no namespace exists, 0 is returned.

    Parameter: relationname name

    Return type: integer

  • is_oid_in_group_members

    Description: Not supported

    Parameter: node_oid oid, group_members oidvector_extend

    Return type: Boolean

  • isubmit_on_nodes_internal

    Description: Not supported

    Parameter: job bigint, node_name name, database name, what text, next_date timestamp without time zone, job_interval text

    Return type: integer

  • listagg

    Description: Specifies aggregate functions of the list type.

    Parameters: smallint, text

    Return type: text

  • log_fdw_validator

    Description: Specifies validation functions.

    Parameters: text[], oid

    Return type: void

  • nvarchar2typmodin

    Description: Obtains the typmod information of the varchar type.

    Parameter: cstring[]

    Return type: integer

  • nvarchar2typmodout

    Description: Obtains the typmod information of the varchar type, constructs a character string, and returns the character string.

    Parameter: integer

    Return type: cstring

  • pg_nodes_memmon

    Description: Not supported

    Parameter: nan

    Return type: innernname text, innerusedmem bigint, innertopctxt bigint, nname text, usedmem text, sharedbuffercache text, topcontext text

  • read_disable_conn_file

    Description: Reads forbidden connection files.

    Parameter: nan

    Return type: disconn_mode text, disconn_host text, disconn_port text, local_host text, local_port text, redo_finished text

  • regex_like_m

    Description: Specifies the regular expression match, which is used to determine whether a character string complies with a specified regular expression.

    Parameters: text, text

    Return type: Boolean

  • update_pgjob

    Description: Updates a job.

    Parameters: bigint, "char", bigint, timestamp without time zone, timestamp without time zone, timestamp without time zone, timestamp without time zone, timestamp without time zone, smallint, text

    Return type: void

  • enum_cmp

    Description: Specifies the enumeration comparison function, which is used to determine whether two enumeration classes are equal and determine their relative sizes.

    Parameters: anyenum, anyenum

    Return type: integer

  • enum_eq

    Description: Specifies the enumeration comparison function, which is used to implement the equal sign (=).

    Parameters: anyenum, anyenum

    Return type: Boolean

  • enum_first

    Description: Returns the first element in the enumeration class.

    Parameter: anyenum

    Return type: anyenum

  • enum_ge

    Description: Specifies the enumeration comparison function, which is used to implement the greater-than sign (>) and equal sign (=).

    Parameters: anyenum, anyenum

    Return type: Boolean

  • enum_gt

    Description: Specifies the enumeration comparison function, which is used to implement the greater-than sign (>).

    Parameters: anyenum, anyenum

    Return type: Boolean

  • enum_in

    Description: Specifies the enumeration comparison function, which is used to determine whether an element is in an enumeration class.

    Parameters: cstring, OID

    Return type: anyenum

  • enum_larger

    Description: Specifies the enumeration comparison function, which is used to implement the greater-than sign (>).

    Parameters: anyenum, anyenum

    Return type: anyenum

  • enum_last

    Description: Returns the last element in the enumeration class.

    Parameter: anyenum

    Return type: anyenum

  • enum_le

    Description: Specifies the enumeration comparison function, which is used to implement the less-than sign (<) and equal sign (=).

    Parameters: anyenum, anyenum

    Return type: Boolean

  • enum_lt

    Description: Specifies the enumeration comparison function, which is used to implement the less-than sign (<).

    Parameters: anyenum, anyenum

    Return type: Boolean

  • enum_smaller

    Description: Specifies the enumeration comparison function, which is used to implement the less-than sign (<).

    Parameters: anyenum, anyenum

    Return type: Boolean

  • node_oid_name

    Description: Not supported

    Parameter: oid

    Return type: cstring

  • pg_buffercache_pages

    Description: Reads data from the shared buffer.

    Parameter: nan

    Return type: bufferid integer, relfilenode oid, bucketid smallint, storage_type oid, reltablespace oid, reldatabase oid, relforknumber smallint, relblocknumber bigint, isdirty boolean, usage_count smallint

  • pg_check_xidlimit

    Description: Checks whether nextxid is greater than or equal to xidwarnlimit.

    Parameter: nan

    Return type: Boolean

  • pg_comm_delay

    Description: Displays the delay status of the communications library of a single DN.

    Parameter: nan

    Return type: text, text, integer, integer, integer, integer

  • pg_comm_recv_stream

    Description: Displays the receiving stream status of all communication libraries on a single DN.

    Parameter: nan

    Return type: text, bigint, text, bigint, integer, integer, integer, text, bigint, integer, integer, integer, bigint, bigint, bigint, bigint, bigint

  • pg_comm_send_stream

    Description: Displays the sending stream status of all communication libraries on a single DN.

    Parameter: nan

    Return type: text, bigint, text, bigint, integer, integer, integer, text, bigint, integer, integer, integer, bigint, bigint, bigint, bigint, bigint

  • pg_comm_status

    Description: Displays the communication status of a single DN.

    Parameter: nan

    Return type: text, integer, integer, bigint, bigint, bigint, bigint, bigint, integer, integer, integer, integer, integer

  • pg_log_comm_status

    Description: Prints some logs on the DN.

    Parameter: nan

    Return type: Boolean

  • pg_parse_clog

    Description: Parses clog to obtain the status of xid.

    Parameter: nan

    Return type: xid xid, status text

  • pg_pool_ping

    Description: Sets PoolerPing.

    Parameter: Boolean

    Return type: SETOF boolean

  • pg_pool_validate

    Description: Compares fields in the pgxc_node system catalog to check whether a connection is available.

    Parameter: clear boolean, co_node_name cstring

    Return type: pid bigint, node_name text

  • pg_resume_bkp_flag

    Description: Obtains the delay xlong flag for backup and restoration.

    Parameter: slot_name name

    Return type: start_backup_flag boolean, to_delay boolean, ddl_delay_recycle_ptr text, rewind_time text

  • pg_stat_get_pooler_status

    Description: Queries the cache connection status in the pooler.

    Parameter: nan

    Return type: text, text, bigint, text, bigint, boolean, text, bigint, bigint, bigint, bigint, bigint

    Table 1 PG_STAT_GET_POOLER_STATUS columns

    Name

    Type

    Description

    database_name

    OUT text

    Database name.

    user_name

    OUT text

    Username.

    tid

    OUT bigint

    In non-thread pool logic, this parameter indicates the ID of the thread connected to the CN. In thread pool logic, this parameter indicates the ID of the session connected to the CN.

    pgoptions

    OUT text

    Database connection option. For details, see the options column in Connection Parameters.

    node_oid

    OUT bigint

    OID of the node connected.

    in_use

    OUT boolean

    Specifies whether the connection is currently used.
    • t (true): The connection is in use.
    • f (false): The connection is not in use.

    session_params

    OUT text

    GUC session parameter delivered by the connection.

    fdsock

    OUT bigint

    Local socket.

    remote_pid

    OUT bigint

    Peer thread ID

    used_count

    OUT bigint

    Number of reuse times of a connection.

    idx

    OUT bigint

    Peer DN ID in the local CN.

    streamid

    OUT bigint

    Stream ID in the physical connection.

  • gs_validate_ext_listen_ip

    Description: Connects to DNs, queries invalid service threads on DNs connected to the original extended IP address, and clears the threads.

    Parameter: For details, see Table 2.

    Return value: bigint pid, text node_name

    Note: This function is used only when old connections still exist on the original extended IP address after the extended IP address is reloaded. This function clears the threads where the original IP connections are located. Executing this function will clear communication listening on the extended IP address. Exercise caution when performing O&M operations. Currently, this command can be executed only by connecting to DNs and delivered by the administrator.

    Table 2 GS_VALIDATE_EXT_LISTEN_IP columns

    Name

    Type

    Description

    clear

    IN cstring

    Specifies whether to clear data. The options are as follows: on: clear; off: not clear.

    validate_node_name

    IN cstring

    Name of the DN where the extended IP address connections to be cleared are located.

    validate_ip

    IN cstring

    Extended IP address whose connections are to be cleared.

    pid

    OUT bigint

    ID of the service thread where the extended IP address connections to be cleared are located.

    node_name

    OUT text

    Name of the instance to which the extended IP address connections to be cleared belong.

  • gs_comm_listen_address_ext_info

    Description: Displays the DFX information about the extended IP address configured for listen_address_ext connected to the current instance.

    Parameter: nan

    Return type: text node_name, text app, bigint tid, integer lwtid, bigint query_id, integer socket, text remote_ip, text remote_port, text local_ip, text local_port

    Table 3 GS_COMM_LISTEN_ADDRESS_EXT_INFO columns

    Name

    Type

    Description

    node_name

    OUT text

    Name of the current instance.

    app

    OUT text

    Client connected to the DN.

    tid

    OUT bigint

    Thread ID of the current thread.

    lwtid

    OUT integer

    Lightweight thread ID of the current thread.

    query_id

    OUT bigint

    Query ID of the current thread.

    socket

    OUT integer

    Socket FD of the current physical connection.

    remote_ip

    OUT text

    Peer IP address of the current connection.

    remote_port

    OUT text

    Peer port of the current connection.

    local_ip

    OUT text

    Local IP address of the current connection.

    local_port

    OUT text

    Local port of the current connection.

  • gs_get_global_listen_address_ext_info()

    Description: Queries the global extended IP address configuration on the CN.

    Parameter: For details, see Table 4.

    Return type: text node_name, text host, text port, text ext_listen_ip

    Note: If the input parameter of the function is all, the function depends on the ext_ip_info static configuration file. If the file is abnormal, use the CM/OM tool to rectify the fault. In this case, the configuration cannot be updated in real time. You can set the input parameter to primary to obtain the configuration information about all primary DNs.

    Table 4 GS_GET_GLOBAL_LISTEN_ADDRESS_EXT_INFO columns

    Name

    Type

    Description

    dn_mode

    IN cstring

    Specifies the range of DNs to be displayed. If this parameter is set to null, all DNs are queried by default.

    node_name

    OUT text

    DN name.

    host

    OUT text

    Listening IP address of the DN.

    port

    OUT text

    Listening port of the DN.

    ext_listen_ip

    OUT text

    Extended listening IP address of the DN.

  • gs_get_listen_address_ext_info()

    Description: Queries the extended IP address configuration of the current instance.

    Parameter: nan

    Return type: text node_name, text host, bigint port, text ext_listen_ip

    Table 5 GS_GET_LISTEN_ADDRESS_EXT_INFO

    Name

    Type

    Description

    node_name

    OUT text

    DN name.

    host

    OUT text

    Listening IP address of the DN.

    port

    OUT bigint

    Listening port of the DN.

    ext_listen_ip

    OUT text

    Extended listening IP address of the DN.

  • psortoptions

    Description: Returns the psort attribute.

    Parameters: text[], Boolean

    Return type: bytea

  • remove_job_class_depend

    Description: Removes the job dependency.

    Parameter: oid

    Return type: void

  • xideq4

    Description: Compares two xids to check whether they are the same.

    Parameters: xid32, xid32

    Return type: Boolean

  • xideqint8

    Description: Compares two xids to check whether they are the same.

    Parameters: xid, bigint

    Return type: Boolean

  • xidlt

    Description: Returns whether xid1 < xid2 is true.

    Parameters: xid, xid

    Return type: Boolean

  • xidlt4

    Description: Returns whether xid1 < xid2 is true.

    Parameters: xid32, xid32

    Return type: Boolean

  • get_local_cont_query_stat

    Description: Obtains the statistics of a specified continuous computing view on the local node.

    Parameter: cq_id oid

    Return value type: cq oid, w_in_rows int8, w_in_bytes int8, w_out_rows int8, w_out_bytes int8, w_pendings int8, w_errors int8, r_in_rows int8, r_in_bytes int8, r_out_rows int8, r_out_bytes int8, r_errors int8, c_in_rows int8, c_in_bytes int8, c_out_rows int8, c_out_bytes int8, c_pendings int8, c_errors int8

  • get_local_cont_query_stats

    Description: Obtains all continuous computing view statistics of the local node.

    Parameter: nan

    Return value type: cq oid, w_in_rows int8, w_in_bytes int8, w_out_rows int8, w_out_bytes int8, w_pendings int8, w_errors int8, r_in_rows int8, r_in_bytes int8, r_out_rows int8, r_out_bytes int8, r_errors int8, c_in_rows int8, c_in_bytes int8, c_out_rows int8, c_out_bytes int8, c_pendings int8, c_errors int8

  • get_cont_query_stats

    Description: Obtains statistics about all continuous computing views on each DN.

    Parameter: nan

    Return value type: node name, cq oid, w_in_rows int8, w_in_bytes int8, w_out_rows int8, w_out_bytes int8, w_pendings int8, w_errors int8, r_in_rows int8, r_in_bytes int8, r_out_rows int8, r_out_bytes int8, r_errors int8, c_in_rows int8, c_in_bytes int8, c_out_rows int8, c_out_bytes int8, c_pendings int8, c_errors int8

  • reset_local_cont_query_stat

    Description: Resets the statistics of a specified continuous computation view on the local node.

    Parameter: cq_id oid

    Return type: Boolean

  • reset_local_cont_query_stats

    Description: Resets association statistics on the specified continuous computation view of the local node.

    Parameter: cq_id oid

    Return type: Boolean

  • reset_cont_query_stats

    Description: Resets the continuous computation view statistics corresponding to the STREAM object on each DN.

    Parameter: stream_id oid

    Return type: Boolean

  • check_cont_query_schema_changed

    Description: Determines the schema change status of a specified continuous computation view.

    Parameter: cq_id oid

    Return type: Boolean

  • gs_get_standby_cluster_barrier_status

    Description: Queries the barrier log replay information of the standby CN or DN, including the latest received barrier, LSN of the latest received barrier, barrier played back last time, and target barrier to be played back.

    Parameter: nan

    Return type: barrier_id text, barrier_lsn text, recovery_id text, target_id text

    Note: To call this function, the user must have the SYSADMIN or OPRADMIN permission, and operate_mode must be enabled for the O&M administrator role.

  • gs_set_standby_cluster_target_barrier_id

    Description: Sets the target barrier to be played back.

    Parameter: barrier_id

    Return type: target_id text

    Note: To call this function, the user must have the SYSADMIN or OPRADMIN permission, and operate_mode must be enabled for the O&M administrator role.

  • gs_query_standby_cluster_barrier_id_exist

    Description: Queries whether the specified barrier is received by the standby node.

    Parameter: barrier_id

    Return type: Boolean

    Note: To call this function, the user must have the SYSADMIN or OPRADMIN permission, and operate_mode must be enabled for the O&M administrator role.

  • standby_read_status

    Description: Obtains the CSN snapshot information of all DNs in a cluster, the difference between the primary and standby DNs, and the CSN snapshot information used for the last read query on the standby node.

    Parameter: nan

    Return type: text, text, text, integer, bigint, bigint, bigint

    Table 6 standby_read_status columns

    Name

    Type

    Description

    name

    text

    DN name

    type

    text

    DN type (primary for the primary node and standby for the standby node)

    host

    text

    IP address used by the DN

    port

    integer

    Port used by the DN

    collected_csn

    bigint

    CSN snapshot information of the DN (For the primary node, the value is 0. For the standby node, the value is the collected CSN.)

    delay

    bigint

    Difference between the primary and standby DNs. The unit is ms.

    visited_csn

    bigint

    CSN information used for the last read query on the standby node. (This parameter is valid only for the standby node where the last query is executed.)

  • gs_shutdown_cross_region_walsenders

    Description: Interrupts cross-cluster streaming replication.

    Parameter: nan

    Return type: void

    Note: To call this function, the user must have the SYSADMIN or OPRADMIN permission, and operate_mode must be enabled for the O&M administrator role.

    The following stream functions exist but are not supported. You are advised not to use them.

    streaming_int8_avg_gather, streaming_numeric_avg_gather, streaming_float8_avg_gather, streaming_interval_avg_gather, streaming_int8_sum_gather, and streaming_int2_int4_sum_gather

  • is_dblink_in_transaction

    Description: Checks whether a database link corresponding to an OID is used in the current transaction.

    Parameter: oid

    Return type: Boolean

  • dblink_has_updatasent

    Description: Checks whether DML statements are sent using a database link corresponding to an OID in the current transaction and are not committed.

    Parameter: oid

    Return type: Boolean

  • get_last_xmin_by_oid

    Description: Obtains the maximum xmin value of all columns in a table based on the table OID.

    Parameter: oid

    Return type: xid

  • get_relid_by_relname

    Description: Obtains the OID of a table based on the table name and relnamespace.

    Parameter: cstring, oid

    Return type: oid