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MySQL 5.5 Reference Manual  /  ...  /  The INFORMATION_SCHEMA TP_THREAD_STATE Table

21.31.3 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 21.4 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


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