Edgewall Software

Database Backend

Trac supports the following databases:

Database Installation Instructions


Installed out-of-the-box. The default connection string is sqlite:db/trac.db.

More parameters can be added using a connection string like sqlite:db/trac.db?param1=value&param2=value. The following parameters are supported:

  • extensions: Load the extensions, see also TracIni.
  • timeout: Set timeout to connect the database, 10.0 is used by default.
  • cursor: eager cursor pre-fetching all the rows is used by default. It can be turned off by specifying cursor= (#3446).
  • journal_mode: Set the journal mode to the database (since 1.0.5).
  • synchronous: Set the synchronous flag (since 1.0.5).

Known issues: see SQLite-related tickets.



  • Trac ≥0.9.
  • Have a working copy of Postgresql.
  • Get the proper database driver for Python: psycopg2 bindings
  • Create a database for your Trac environment:
    % createdb dbname
  • Run trac-admin to create a new Trac environment. When prompted for a Database connection string, use:

Notice that the port number might be different in your Postgresql installation, eg 5433. See postgresql.conf.

Alternatively on UNIX, if the database is a local one, you can use UNIX sockets instead of TCP/IP:


If you are using user Trac without a password to connect through UNIX sockets to database trac and have only one project (hence no need for different schemas), your connections string would be postgres://trac:@/trac

  • Note: '?host=…' is optional. Check your postgresql.conf' unix_socket_directory option if you have connection problems.

See #4546 for more details.

See also #2441, which discusses the process of migration from SQLite to Postgresql.

For a Postgresql recipe tested on CentOS4 (Red Hat -EL4) see PostgresqlRecipe.

Note: Since Trac 0.10 the psycopg1 Postgresql driver is no longer supported due to lack of Unicode support. pyPgSQL also presents issues for some users, see #5096.

Finally, see #126 for historical notes.

Known issues: see postgres-related tickets


MySQL is supported by Trac since 0.10, but there are some caveats, documented in more details in the MySqlDb page.

  • Run trac-admin to create a new Trac environment. When prompted for a database connection string, use:
  • or when you need more options:

The following parameters are supported since Trac 1.0:

  • compress: Enable compression (0 or 1)
  • init_command: Command to run once the connection is created
  • named_pipe: Use a named pipe to connect on Windows (0 or 1)
  • read_default_file: Read default client values from the given file (also used for SSL configuration)
  • read_default_group: Configuration group to use from the default file
  • unix_socket: Use a Unix socket at the given path to connect

see status report and #986 for historical notes.

Known issues: see mysql-related tickets.

Database Conversion

For Trac ≥ 1.3.2, the TracAdmin convert_db command allows an environment to be converted between the supported database backends. For Trac < 1.3.2, TracMigratePlugin provides equivalent functionality.

Other Databases

Trac offers an easily extensible layer for database support, see trac.db.api. The databases above have been integrated in this layer.

Other databases where support has been requested or where support exists via plugins are:

Last modified 6 years ago Last modified on May 26, 2018, 9:24:40 PM
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