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25.20 The INFORMATION_SCHEMA PROFILING Table

Contents

The PROFILING table provides statement profiling information. Its contents correspond to the information produced by the SHOW PROFILE and SHOW PROFILES statements (see Section 13.7.6.30, “SHOW PROFILE Syntax”). The table is empty unless the profiling session variable is set to 1.

Note

This table is deprecated and will be removed in a future MySQL release. Use the Performance Schema instead; see Section 26.19.1, “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

  • The PROFILING table is a nonstandard INFORMATION_SCHEMA table.

Profiling information is also available from the SHOW PROFILE and SHOW PROFILES statements. See Section 13.7.6.30, “SHOW PROFILE Syntax”. For example, the following queries are equivalent:

  1. SHOW PROFILE FOR QUERY 2;
  2.  
  3. SELECT STATE, FORMAT(DURATION, 6) AS DURATION
  4. FROM INFORMATION_SCHEMA.PROFILING
  5. WHERE QUERY_ID = 2 ORDER BY SEQ;

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Document created the 26/06/2006, last modified the 26/10/2018
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