| Type: | integer |
| Default: | 1024 (8MB) |
| Min: | 0 (0kB) |
| Max: | 715827882 (5726623056kB) |
| Unit: | 8kB |
| Context: | user |
| Restart: | false |
| Since: | 10 |
Sets the minimum amount of table data that must be scanned in order for a parallel scan to be considered. For a parallel sequential scan, the amount of table data scanned is always equal to the size of the table, but when indexes are used the amount of table data scanned will normally be less. If this value is specified without units, it is taken as blocks, that is BLCKSZ bytes, typically 8kB. The default is 8 megabytes (8MB).
Recommendations
… , unless doing IoT or a read-only database. Raise to 100MB or so if your traffic on the database is very bursty, to prevent the WAL from shrinking too much.
On StackOverflow
On pgsql-hackers
- BUG #18545: \dt breaks transaction, calling error when executed in SET SESSION AUTHORIZATION
- Re: Support run-time partition pruning for hash join
- Re: Parallelize correlated subqueries that execute within each worker
- Re: Allowing parallel-safe initplans
- Re: query_id, pg_stat_activity, extended query protocol