aurora_stat_wait_event - Amazon Aurora

aurora_stat_wait_event

Lists all supported wait events for Aurora PostgreSQL. For information about Aurora PostgreSQL wait events, see Amazon Aurora PostgreSQL wait events.

Syntax

aurora_stat_wait_event()

Arguments

None

Return type

SETOF record with following columns:

  • type_id – The ID of the type of wait event.

  • event_id – The ID of the wait event.

  • type_name – Wait type name

  • event_name – Wait event name

Usage notes

To see event names with event types instead of IDs, use this function together with other functions such as aurora_stat_wait_type and aurora_stat_system_waits. Wait event names returned by this function are the same as those returned by the aurora_wait_report function.

Examples

The following example shows results from calling the aurora_stat_wait_event function.

=> SELECT * FROM aurora_stat_wait_event(); type_id | event_id | event_name ---------+-----------+------------------------------------------- 1 | 16777216 | <unassigned:0> 1 | 16777217 | ShmemIndexLock 1 | 16777218 | OidGenLock 1 | 16777219 | XidGenLock . . . 9 | 150994945 | PgSleep 9 | 150994946 | RecoveryApplyDelay 10 | 167772160 | BufFileRead 10 | 167772161 | BufFileWrite 10 | 167772162 | ControlFileRead . . . 10 | 167772226 | WALInitWrite 10 | 167772227 | WALRead 10 | 167772228 | WALSync 10 | 167772229 | WALSyncMethodAssign 10 | 167772230 | WALWrite 10 | 167772231 | XactSync . . . 11 | 184549377 | LsnAllocate

The following example joins aurora_stat_wait_type and aurora_stat_wait_event to return type names and event names for improved readability.

=> SELECT * FROM aurora_stat_wait_type() t JOIN aurora_stat_wait_event() e ON t.type_id = e.type_id; type_id | type_name | type_id | event_id | event_name ---------+-----------+---------+-----------+------------------------------------------- 1 | LWLock | 1 | 16777216 | <unassigned:0> 1 | LWLock | 1 | 16777217 | ShmemIndexLock 1 | LWLock | 1 | 16777218 | OidGenLock 1 | LWLock | 1 | 16777219 | XidGenLock 1 | LWLock | 1 | 16777220 | ProcArrayLock . . . 3 | Lock | 3 | 50331648 | relation 3 | Lock | 3 | 50331649 | extend 3 | Lock | 3 | 50331650 | page 3 | Lock | 3 | 50331651 | tuple . . . 10 | IO | 10 | 167772214 | TimelineHistorySync 10 | IO | 10 | 167772215 | TimelineHistoryWrite 10 | IO | 10 | 167772216 | TwophaseFileRead 10 | IO | 10 | 167772217 | TwophaseFileSync . . . 11 | LSN | 11 | 184549376 | LsnDurable