aurora_stat_memctx_usage
Reports the memory context usage for each PostgreSQL process.
Syntax
aurora_stat_memctx_usage()Arguments
None
Return type
SETOF record with the following columns:
-
pid– The ID of the process. -
name– The name of the memory context. -
allocated– The number of bytes obtained from the underlying memory subsystem by the memory context. -
used– The number of bytes committed to clients of the memory context. -
instances– The count of currently existing contexts of this type.
Usage notes
This function displays the memory context usage for each PostgreSQL process. Some
processes are labeled anonymous. The processes aren't exposed because
they contain restricted keywords.
This function is available starting with the following Aurora PostgreSQL versions:
-
15.3 and higher 15 versions
-
14.8 and higher 14 versions
-
13.11 and higher 13 versions
-
12.15 and higher 12 versions
-
11.20 and higher 11 versions
Examples
The following example shows the results of calling the
aurora_stat_memctx_usage function.
=>SELECT * FROM aurora_stat_memctx_usage();pid| name | allocated | used | instances -------+---------------------------------+-----------+---------+----------- 123864 | Miscellaneous | 19520 | 15064 | 3 123864 | Aurora File Context | 8192 | 616 | 1 123864 | Aurora WAL Context | 8192 | 296 | 1 123864 | CacheMemoryContext | 524288 | 422600 | 1 123864 | Catalog tuple context | 16384 | 13736 | 1 123864 | ExecutorState | 32832 | 28304 | 1 123864 | ExprContext | 8192 | 1720 | 1 123864 | GWAL record construction | 1024 | 832 | 1 123864 | MdSmgr | 8192 | 296 | 1 123864 | MessageContext | 532480 | 353832 | 1 123864 | PortalHeapMemory | 1024 | 488 | 1 123864 | PortalMemory | 8192 | 576 | 1 123864 | printtup | 8192 | 296 | 1 123864 | RelCache hash table entries | 8192 | 8152 | 1 123864 | RowDescriptionContext | 8192 | 1344 | 1 123864 | smgr relation context | 8192 | 296 | 1 123864 | Table function arguments | 8192 | 352 | 1 123864 | TopTransactionContext | 8192 | 632 | 1 123864 | TransactionAbortContext | 32768 | 296 | 1 123864 | WAL record construction | 50216 | 43904 | 1 123864 | hash table | 65536 | 52744 | 6 123864 | Relation metadata | 191488 | 124240 | 87 104992 | Miscellaneous | 9280 | 7728 | 3 104992 | Aurora File Context | 8192 | 376 | 1 104992 | Aurora WAL Context | 8192 | 296 | 1 104992 ||Autovacuum Launcher | 8192 | 296 | 1 104992 | Autovacuum database list | 16384 | 744 | 2 104992 | CacheMemoryContext | 262144 | 140288 | 1 104992 | Catalog tuple context | 8192 | 296 | 1 104992 | GWAL record construction | 1024 | 832 | 1 104992 | MdSmgr | 8192 | 296 | 1 104992 | PortalMemory | 8192 | 296 | 1 104992 | RelCache hash table entries | 8192 | 296 | 1 104992 | smgr relation context | 8192 | 296 | 1 104992 | Autovacuum start worker (tmp) | 8192 | 296 | 1 104992 | TopTransactionContext | 16384 | 592 | 2 104992 | TransactionAbortContext | 32768 | 296 | 1 104992 | WAL record construction | 50216 | 43904 | 1 104992 | hash table | 49152 | 34024 | 4 (39 rows)
Some restricted keywords will be hidden and the output will look as follows:
postgres=>SELECT * FROM aurora_stat_memctx_usage();pid| name | allocated | used | instances -------+---------------------------------+-----------+---------+----------- 5482 | anonymous | 8192 | 456 | 1 5482 | anonymous | 8192 | 296 | 1