Zone and Formatting
This section describes parameters related to the time format setting.
DateStyle
Parameter description: Specifies the display format for date and time values, as well as the rules for interpreting ambiguous date input values.
This variable contains two independent components: the output format specifications (ISO, Postgres, SQL, or German) and the input/output order of year/month/day (DMY, MDY, or YMD). The two components can be set separately or together. The keywords Euro and European are synonyms for DMY; the keywords US, NonEuro, and NonEuropean are synonyms for MDY.
Type: USERSET
Value range: a string
Default value: ISO, MDY
Suggestion: The ISO format is recommended. Postgres, SQL, and German use abbreviations for time zones, such as EST, WST, and CST. These abbreviations can be ambiguous. For example, CST can represent Central Standard Time (USA) UT-6:00, Central Standard Time (Australia) UT+9:30, and others. This may lead to incorrect time zone conversion and cause errors.
IntervalStyle
Parameter description: Specifies the display format for interval values.
Type: USERSET
Value range: enumerated values
- sql_standard indicates that output matching SQL standards will be generated.
- postgres indicates that output matching PostgreSQL 8.4 will be generated when the DateStyle parameter is set to ISO.
- postgres_verbose indicates that output matching PostgreSQL 8.4 will be generated when the DateStyle parameter is set to non_ISO.
- iso_8601 indicates that output matching the time interval "format with designators" defined in ISO 8601 will be generated.
- oracle indicates the output result that matches the numtodsinterval function in the Oracle database. For details, see numtodsinterval.
The IntervalStyle parameter also affects the interpretation of ambiguous interval input.
Default value: postgres
TimeZone
Parameter description: Specifies the time zone for displaying and interpreting time stamps.
Type: USERSET
Value range: a string. You can obtain it by querying the pg_timezone_names view.
Default value: PRC
gs_initdb will set a time zone value that is consistent with the system environment.
timezone_abbreviations
Parameter description: Specifies the time zone abbreviations that will be accepted by the server.
Type: USERSET
Value range: a string. You can obtain it by querying the pg_timezone_names view.
Default value: Default
Default indicates an abbreviation that works in most of the world. There are also other abbreviations, such as Australia and India that can be defined for a particular installation.
extra_float_digits
Parameter description: Specifies the number of digits displayed for floating-point values, including float4, float8, and geometric data types. The parameter value is added to the standard number of digits (FLT_DIG or DBL_DIG as appropriate).
Type: USERSET
Value range: an integer ranging from –15 to 3
- This parameter can be set to 3 to include partially-significant digits. It is especially useful for dumping float data that needs to be restored exactly.
- This parameter can also be set to a negative value to suppress unwanted digits.
Default value: 0
client_encoding
Parameter description: Specifies the client-side encoding type (character set).
Set this parameter as needed. Try to keep the client code and server code consistent to improve efficiency.
Type: USERSET
Value range: encoding compatible with PostgreSQL. UTF8 indicates that the database encoding is used.
- You can run the locale -a command to check and set the system-supported zone and the corresponding encoding format.
- By default, gs_initdb will initialize the setting of this parameter based on the current system environment. You can also run the locale command to check the current configuration environment.
- To use consistent encoding for communication within a cluster, you are advised to retain the default value of client_encoding. Modification to this parameter in the postgresql.conf file (by using the gs_guc tool, for example) does not take effect.
Default value: UTF8
Recommended value: SQL_ASCII or UTF8
lc_messages
Parameter description: Specifies the language in which messages are displayed.
Valid values depend on the current system. On some systems, this zone category does not exist. Setting this variable will still work, but there will be no effect. In addition, translated messages for the desired language may not exist. In this case, you can still see the English messages.
Type: SUSET
Value range: a string
- You can run the locale -a command to check and set the system-supported zone and the corresponding encoding format.
- By default, gs_initdb will initialize the setting of this parameter based on the current system environment. You can also run the locale command to check the current configuration environment.
Default value: C
lc_monetary
Parameter description: Specifies the display format of monetary values. It affects the output of functions such as to_char. Valid values depend on the current system.
Type: USERSET
Value range: a string
- You can run the locale -a command to check and set the system-supported zone and the corresponding encoding format.
- By default, gs_initdb will initialize the setting of this parameter based on the current system environment. You can also run the locale command to check the current configuration environment.
Default value: C
lc_numeric
Parameter description: Specifies the display format of numbers. It affects the output of functions such as to_char. Valid values depend on the current system.
Type: USERSET
Value range: a string
- You can run the locale -a command to check and set the system-supported zone and the corresponding encoding format.
- By default, gs_initdb will initialize the setting of this parameter based on the current system environment. You can also run the locale command to check the current configuration environment.
Default value: C
lc_time
Parameter description: Specifies the display format of time and zones. It affects the output of functions such as to_char. Valid values depend on the current system.
Type: USERSET
Value range: a string
- You can run the locale -a command to check and set the system-supported zone and the corresponding encoding format.
- By default, gs_initdb will initialize the setting of this parameter based on the current system environment. You can also run the locale command to check the current configuration environment.
Default value: C
default_text_search_config
Parameter description: Specifies the text search configuration.
If the specified text search configuration does not exist, an error will be reported. If the specified text search configuration is deleted, set default_text_search_config again. Otherwise, an error will be reported, indicating incorrect configuration.
- The text search configuration is used by text search functions that do not have an explicit argument specifying the configuration.
- When a configuration file matching the environment is determined, gs_initdb will initialize the configuration file with a setting that corresponds to the environment.
Type: USERSET
Value range: a string
GaussDB(DWS) supports the following two configurations: pg_catalog.english and pg_catalog.simple.
Default value: pg_catalog.english
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