| Type: | integer |
| Default: | 32 (256kB) |
| Min: | 16 (128kB) |
| 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_multixact/members (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 32. This parameter can only be set at server start.