aurora_stat_wait_event - Amazon Aurora
SyntaxArgumentsReturn typeUsage notesExamples
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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 the 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