[Koha-bugs] [Bug 11974] New: Enable unix socket connections for database connections.

[bugzilla-daemon at bugs.koha-community.org]

http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=11974

            Bug ID: 11974
           Summary: Enable unix socket connections for database
                    connections.
 Change sponsored?: ---
           Product: Koha
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5 - low
         Component: Architecture, internals, and plumbing
          Assignee: gmcharlt at gmail.com
          Reporter: olli-antti.kivilahti at jns.fi
        QA Contact: testopia at bugs.koha-community.org

-----------------
- BUSINESS CASE -
-----------------
Currently Koha doesn't support using a non-default unix socket for database
connections.
Using unix sockets is generally ~30-40% faster compared to using TCP packets.
Because Koha abuses the database a lot, this will make a difference.

------------
- SOLUTION -
------------
Mysql uses unix sockets for localhost connections only, but DBI::Mysql cannot
automatically find the non-default socket path, thus it needs to be explicitly
given.

This patch modifies the C4::Context->dbh() routine to check for the presence of
mysql_socket in koha-conf.xml and prioritize the socket connection.
If making the socket connection fails, dbh() defaults to the TCP-connection if
available.

This patch works on MariaDB and Mysql, hence the configuration variable name
mysql_socket.

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