matrix/roles/synapse/docs/database.md

synapse database configuration

Per default, the ansible role supplies a sqlite-database (file-based), which is located in /opt/synapse/data/homeserver.db (synapse_sqlite_database_file).

PostgresQL

To configure synapse for use with postgresql, set synapse_config_database_name to psycopg2.

Set your connection information in synapse_config_database_args like this:

synapse_config_database_args:
  user: my_synapse_db_user
  password: my_synapse_db_password
  host: my_database_host
  port: my_database_port_to_connect_to
  # connection pooling (cp) settings, min and max connections
  cp_min: 5 | int
  cp_max: 20 | int

Also see the upstream documentation on the database config key.

Transaction limits

The ansible role sets a default transaction limit of 10.000 concurrent transactions. This configuration can be overridden in synapse_config_database_txn_limit.