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26.12.15.3 The tp_thread_state Table

Contents
Note

The Performance Schema table described here is available as of MySQL 8.0.14. Prior to MySQL 8.0.14, use the corresponding INFORMATION_SCHEMA table instead; see Section 25.40.3, “The INFORMATION_SCHEMA TP_THREAD_STATE Table”.

The tp_thread_state table has one row per thread created by the thread pool to handle connections.

The tp_thread_state table has these columns:

  • TP_GROUP_ID

    The thread group ID.

  • TP_THREAD_NUMBER

    The ID of the thread within its thread group. TP_GROUP_ID and TP_THREAD_NUMBER together provide a unique key within the table.

  • PROCESS_COUNT

    The 10ms interval in which the statement that uses this thread is currently executing. 0 means no statement is executing, 1 means it is in the first 10ms, and so forth.

  • WAIT_TYPE

    The type of wait for the thread. NULL means the thread is not blocked. Otherwise, the thread is blocked by a call to thd_wait_begin() and the value specifies the type of wait. The xxx_WAIT columns of the tp_thread_group_stats table accumulate counts for each wait type.

    The WAIT_TYPE value is a string that describes the type of wait, as shown in the following table.

    Table 26.3 tp_thread_state Table WAIT_TYPE Values

    Wait Type Meaning
    THD_WAIT_SLEEP Waiting for sleep
    THD_WAIT_DISKIO Waiting for Disk IO
    THD_WAIT_ROW_LOCK Waiting for row lock
    THD_WAIT_GLOBAL_LOCK Waiting for global lock
    THD_WAIT_META_DATA_LOCK Waiting for metadata lock
    THD_WAIT_TABLE_LOCK Waiting for table lock
    THD_WAIT_USER_LOCK Waiting for user lock
    THD_WAIT_BINLOG Waiting for binlog
    THD_WAIT_GROUP_COMMIT Waiting for group commit
    THD_WAIT_SYNC Waiting for fsync

The tp_thread_state table has these indexes:

  • Unique index on (TP_GROUP_ID, TP_THREAD_NUMBER)

TRUNCATE TABLE is not permitted for the tp_thread_state table.


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