26.12.15.3 The tp_thread_state Table

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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References

Manuel MySQL : https://dev.mysql.com/

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