| Type: | string |
| Default: | pg_stat_tmp |
| Context: | sighup |
| Restart: | false |
Sets the directory to store temporary statistics data in. This can be a path relative to the data directory or an absolute path. The default is pg_stat_tmp. Pointing this at a RAM-based file system will decrease physical I/O requirements and can lead to improved performance. This parameter can only be set in the postgresql.conf file or on the server command line.
Recommendations
Useful for extremely high-volume databases; the stats temp directory could be set to a RAMdisk or other high-speed resource (at the cost of potentially losing some stats) as this file gets updated hundreds of times per second.