The amount of memory in KB used by the Postgres processes.Īverages KBytes/sec sent into database server.Īverages KBytes/sec sent out of the database server.Īverage system load for the last 1 minute.In this SQL Query cheat sheet you will learn Number of operations that were aborted due to lock conflicts. Number of deadlocks currently in the server. This does not take in to account hits on the file system's cache.
Ratio of reads-from-buffer-cache to total-reads. However, it’s important not to set this too high, because it can encourage the query planner to choose more inefficient queries.ĭelay between an operation on the master and the application of that operation on the standby. This impacts performance, and might indicate a need to increase the work_mem. When a complex query requires access to more memory than work_mem allows, it has to write some data temporarily to disk in order to do its work. The amount of data written temporarily to disk to execute queries: PostgreSQL reserves a certain amount of memory-specified by work_mem (4 MB by default)-to perform sort operations and hash tables needed to execute queries. Number of requested checkpoints that were performed in the interval. Number of scheduled checkpoints that were performed in the interval. Acquired by the DROP TABLE, TRUNCATE, REINDEX, CLUSTER, VACUUM FULL, etc. This mode guarantees that the holder is the only transaction accessing the table in any way. Total number of locks held in access_exclusive mode. This mode allows only concurrent ACCESS SHARE locks, i.e., only reads from the table can proceed in parallel with a transaction holding this lock mode. Total number of locks held in exclusive mode. Acquired by CREATE TRIGGER and many forms of ALTER TABLE. This mode protects a table against concurrent data changes, and is self-exclusive so that only one session can hold it at a time. Total number of locks held in share_row_exclusive mode. Acquired by CREATE INDEX (without CONCURRENTLY).ĪPI Enum: POSTGRES_LOCK_SHARE_ROW_EXCLUSIVE This mode protects a table against concurrent data changes. Total number of locks held in share mode. This mode protects a table against concurrent schema changes and VACUUM runs.Acquired by VACUUM (without FULL), ANALYZE, CREATE INDEX CONCURRENTLY, and some ALTER TABLE variants. Total number of held in share_update_exclusive mode.
TABLEPLUS ENUM UPDATE
The SELECT FOR UPDATE and SELECT FOR SHARE commands acquire a lock of this mode on the target table(s).ĪPI Enum: POSTGRES_LOCK_SHARE_UPDATE_EXCLUSIVE Total number of locks held in row_share mode.
In general, any query that only reads a table and does not modify it will acquire this lock mode. The SELECT command acquires a lock of this mode on referenced tables. Total number of locks held in acess_share mode. Number of idle connections to the server. Number of currently active connections to the server. The total percentage of time the CPU spent on user applications, operating systems, nice mode, and IO wait. The percentage of time the CPU spent waiting for IO operations to complete. The percentage of time the CPU spent in nice mode. The percentage of time the CPU spent in the operating system. The percentage of time the CPU spent on user applications.
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