msgid "[Vacuuming PostgreSQL](#vacuuming-postgresql), for when you wish to run a Postgres [VACUUM](https://www.postgresql.org/docs/current/sql-vacuum.html) (optimizing disk space)"
msgid "[Upgrading PostgreSQL](#upgrading-postgresql), for upgrading to new major versions of PostgreSQL. Such **manual upgrades are sometimes required**."
msgid "You can use the `/matrix/postgres/bin/cli` tool to get interactive terminal access ([psql](https://www.postgresql.org/docs/11/app-psql.html)) to the PostgreSQL server."
msgid "**Be careful**. Modifying the database directly (especially as services are running) is dangerous and may lead to irreversible database corruption. When in doubt, consider [making a backup](#backing-up-postgresql)."
msgid "Deleting lots data from Postgres does not make it release disk space, until you perform a [`VACUUM` operation](https://www.postgresql.org/docs/current/sql-vacuum.html)."
msgid "`analyze` runs `ANALYZE VERBOSE` without stopping any services (this is just [ANALYZE](https://www.postgresql.org/docs/current/sql-analyze.html) without doing a vacuum, so it's faster)"
msgid "**Note**: for the `vacuum-complete` and `vacuum-full` presets, you'll need plenty of available disk space in your Postgres data directory (usually `/matrix/postgres/data`). These presets also stop all services (e.g. Synapse, etc.) while the vacuum operation is running."
msgid "`just run-tags run-postgres-vacuum -e postgres_vacuum_preset=analyze`: runs the `analyze` preset with all services remaining operational at all times"
msgid "To automatically make Postgres database backups on a fixed schedule, see [Setting up postgres backup](configuring-playbook-postgres-backup.md)."
msgid "If you are using an [external Postgres server](configuring-playbook-external-postgres.md), the above command will not work, because neither the credentials file (`/matrix/postgres/env-postgres-psql`), nor the `matrix-postgres` container is available."
msgid "Unless you are using an [external Postgres server](configuring-playbook-external-postgres.md), this playbook initially installs Postgres for you."
msgid "Once installed, the playbook attempts to preserve the Postgres version it starts with. This is because newer Postgres versions cannot start with data generated by older Postgres versions."
msgid "**The old Postgres data directory is backed up** automatically, by renaming it to `/matrix/postgres/data-auto-upgrade-backup`. To rename to a different path, pass some extra flags to the command above, like this: `--extra-vars=\"postgres_auto_upgrade_backup_data_path=/another/disk/matrix-postgres-before-upgrade\"`"
msgid "As part of the upgrade, the database is dumped to `/tmp`, an upgraded and empty Postgres server is started, and then the dump is restored into the new server. To use a different directory for the dump, pass some extra flags to the command above, like this: `--extra-vars=\"postgres_dump_dir=/directory/to/dump/here\"`"
msgid "To save disk space in `/tmp`, the dump file is gzipped on the fly at the expense of CPU usage. If you have plenty of space in `/tmp` and would rather avoid gzipping, you can explicitly pass a dump filename which doesn't end in `.gz`. Example: `--extra-vars=\"postgres_dump_name=matrix-postgres-dump.sql\"`"
msgid "PostgreSQL can be [tuned](https://wiki.postgresql.org/wiki/Tuning_Your_PostgreSQL_Server) to make it run faster. This is done by passing extra arguments to the Postgres process."
msgid "The [Postgres Ansible role](https://github.com/mother-of-all-self-hosting/ansible-role-postgres) **already does some tuning by default**, which matches the [tuning logic](https://github.com/le0pard/pgtune/blob/master/src/features/configuration/configurationSlice.js) done by websites like https://pgtune.leopard.in.ua/. You can manually influence some of the tuning variables. These parameters (variables) are injected via the `postgres_postgres_process_extra_arguments_auto` variable."
msgid "**adjust the automatically-determined tuning parameters manually**: change the values for the tuning variables defined in the Postgres role's [default configuration file](https://github.com/mother-of-all-self-hosting/ansible-role-postgres/blob/main/defaults/main.yml) (see `postgres_max_connections`, `postgres_data_storage` etc). These variables are ultimately passed to Postgres via a `postgres_postgres_process_extra_arguments_auto` variable"
msgid "**add additional tuning parameters**: define your additional Postgres configuration parameters in `postgres_postgres_process_extra_arguments_custom`. See `postgres_postgres_process_extra_arguments_auto` defined in the Postgres role's [default configuration file](https://github.com/mother-of-all-self-hosting/ansible-role-postgres/blob/main/defaults/main.yml) for inspiration"
