Configuration
These settings cannot be changed as it affects system stability
Important default values
| Parameter | Default value | Comment |
|---|---|---|
| wal_keep_size | 1024 (v.1.50+) / 512 | |
| max_wal_senders | min 16, max 4 x Db Node count | |
| wal_level | replica | |
| hot_standby | ON | |
| max_connections | see below | |
| shared_buffers | instance_memory x 0.25 | |
| effective_cache_size | instance_memory x 0.75 | |
| work_mem | instance_memory / max_connections | |
| maintenance_work_mem | instance_memory/16 |
Max connections
The maximum number of connections depends on the instance size. The number of connections can be scaled by adding a new database secondary allowing of a larger instance size. The new replica can then be promoted to the new primary. See Promoting a replica for more information.
| Instance size (GiB RAM) | Max connections |
|---|---|
| < 4 | 100 |
| 8 | 200 |
| 16 | 400 |
| 32 | 800 |
| 64+ | 1000 |
Archive mode
All nodes are configured with archive_mode=always.
Auto-vacuum
Auto-vacuum settings are set to default. Please read more about automatic vaccuming here