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GS_SLOW_QUERY_INFO

Updated on 2024-08-20 GMT+08:00

GS_SLOW_QUERY_INFO displays the slow query information that has been dumped on the current node, as described in Table 1. Data is dumped from the kernel to this system catalog. If the GUC parameter enable_resource_record is set to on, the system imports the query information from the kernel to GS_WLM_SESSION_QUERY_INFO_ALL every 3 minutes. This operation occupies storage space and affects performance. You can check GS_SLOW_QUERY_INFO to view the slow query information that has been dumped. This view has been discarded in this version.

Table 1 GS_SLOW_QUERY_INFO columns

Name

Type

Description

dbname

text

Database name.

schemaname

text

Schema name.

nodename

text

Node name.

username

text

Username.

queryid

bigint

Normalization ID.

query

text

Query statement.

start_time

timestamp with time zone

Execution start time.

finish_time

timestamp with time zone

Execution end time.

duration

bigint

Execution duration (unit: ms).

query_plan

text

Plan information.

n_returned_rows

bigint

Number of rows in the result set returned by the SELECT statement.

n_tuples_fetched

bigint

Number of rows randomly scanned.

n_tuples_returned

bigint

Number of rows sequentially scanned.

n_tuples_inserted

bigint

Number of rows inserted.

n_tuples_updated

bigint

Number of rows updated.

n_tuples_deleted

bigint

Number of rows deleted.

n_blocks_fetched

bigint

Number of cache loading times.

n_blocks_hit

bigint

Cache hits.

db_time

bigint

Valid DB time, which is accumulated if multiple threads are involved (unit: μs).

cpu_time

bigint

CPU time (unit: μs).

execution_time

bigint

Execution time in the executor (unit: μs).

parse_time

bigint

SQL parsing time (unit: μs).

plan_time

bigint

SQL plan generation time (unit: μs).

rewrite_time

bigint

SQL rewriting time (unit: μs).

pl_execution_time

bigint

Execution time of PL/pgSQL (unit: μs).

pl_compilation_time

bigint

Compilation time of PL/pgSQL (unit: μs).

net_send_time

bigint

Network time (unit: μs).

data_io_time

bigint

I/O time (unit: μs).

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