Postgresql database3/15/2023 ![]() Information is passed from the stats collector via temporary files to requesting processes.Ĭheckpointer Process: In PostgreSQL 9.2 and later versions checkpoint process is performed. ![]() Stats Collector: In this process, Statistics information like pg_stat_activity and for pg_stat_database is collected. This process relies on the stats collector process for perfect table analysis.Īrchiver: If we enable archive mode, this process has the responsibility to copy the WAL log files to a specified directory. It will write a WAL buffer to the WAL file.Īutovacuum Launcher: When autovacuum is enabled, this process has the autovacuum daemon’s responsibility to carry vacuum operations on bloated tables. Logging Collector: This process also called a logger. WAL Writer: This process writes and flushes the WAL data on the WAL buffer to persistent storage periodically. It will keep logs and backup information up to date. But in PostgreSQL 9.2 version checkpointer process was separated from the background writer process. Each process details will be described as follows:īackground Writer process: In PostgreSQL 9.1 version background writer regularly does the checkpoint processing. Each process has its individual features and PostgreSQL internals. Larger settings will improve maintenance performance (VACUUM, ANALYZE, ALTER TABLE, CREATE INDEX, and ADD FOREIGN KEY, etc.) operations.īelow are the background processes of PostgreSQL. It is safe to set maintenance work memory is large as compared to work memory.The default value of maintenance work memory in 9.3 and the older version is 16 megabytes (16 MB) from 9.4, and later default value of maintenance work memory is 64 megabytes (64 MB).We need to specify the maximum amount of memory for database maintenance operations such as VACUUM, ANALYZE, ALTER TABLE, CREATE INDEX, ADD FOREIGN KEY, etc. ![]() The default value of work memory in 9.3 and the older version is 1 megabyte (1 MB) from 9.4, and the later default value of work memory is 4 megabytes (4 MB).Set the specific memory to per client connections to be used by internal sort of operations and hash tables to writing data into temporary disk files.If we set this parameter as wal_buffers = -1, it will set based on shared_buffers. The minimum value of shared buffers is 32 KB. ![]() WAL buffers and WAL files are significant to recover the data at some peak of time at the time of backup and recovery.
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