28.3.24 The INFORMATION_SCHEMA PROFILING Table

The PROFILING table provides statement profiling information. Its contents correspond to the information produced by the SHOW PROFILE and SHOW PROFILES statements (see Section 15.7.7.30, “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:

• QUERY_ID

  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.

Notes

• PROFILING is a nonstandard INFORMATION_SCHEMA table.

Profiling information is also available from the SHOW PROFILE and SHOW PROFILES statements. See Section 15.7.7.30, “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;