MySQL 5.7 Reference Manual Including MySQL NDB Cluster 7.5 and NDB Cluster 7.6
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_WAITTP_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 23.4 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 |