| Type: | integer |
| Default: | 0 (0kB) |
| Min: | 0 (0kB) |
| Max: | 131072 (1GB) |
| Unit: | 8kB |
| Context: | postmaster |
| Restart: | true |
| Since: | 17 |
Specifies the amount of shared memory to use to cache the contents of pg_xact (see pgdata-contents-table). If this value is specified without units, it is taken as blocks, that is BLCKSZ bytes, typically 8kB. The default value is 0, which requests shared_buffers/512 up to 1024 blocks, but not fewer than 16 blocks. This parameter can only be set at server start.