28.3.24 The INFORMATION_SCHEMA PROFILING Table

MySQL 8.4 Reference Manual Including MySQL NDB Cluster 8.4

The PROFILING table provides statement profiling information. Its contents correspond to the information produced by the SHOW PROFILE and SHOW PROFILES statements (see Section 15.7.7.32, “SHOW PROFILE Statement”). The table is empty unless the profiling session variable is set to 1.

Note

This table is deprecated; expect it to be removed in a future MySQL release. Use the Performance Schema instead; see Section 29.19.1, “Query Profiling Using Performance Schema”.

The PROFILING table has these columns:

A numeric statement identifier. - SEQ

A sequence number indicating the display order for rows with the same QUERY_ID value. - STATE

The profiling state to which the row measurements apply. - DURATION

How long statement execution remained in the given state, in seconds. - CPU_USER, CPU_SYSTEM

User and system CPU use, in seconds. - CONTEXT_VOLUNTARY, CONTEXT_INVOLUNTARY

How many voluntary and involuntary context switches occurred. - BLOCK_OPS_IN, BLOCK_OPS_OUT

The number of block input and output operations. - MESSAGES_SENT, MESSAGES_RECEIVED

The number of communication messages sent and received. - PAGE_FAULTS_MAJOR, PAGE_FAULTS_MINOR

The number of major and minor page faults. - SWAPS

How many swaps occurred. - SOURCE_FUNCTION, SOURCE_FILE, and SOURCE_LINE

Information indicating where in the source code the profiled state executes.

Profiling information is also available from the SHOW PROFILE and SHOW PROFILES statements. See Section 15.7.7.32, “SHOW PROFILE Statement”. For example, the following queries are equivalent:

SHOW PROFILE FOR QUERY 2;

SELECT STATE, FORMAT(DURATION, 6) AS DURATION
FROM INFORMATION_SCHEMA.PROFILING
WHERE QUERY_ID = 2 ORDER BY SEQ;