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.. _admin_roundcube-settings_imap_cache:
``imap_cache``
==============
Cache generic IMAP metadata, such as lists of mailboxes, and the last
known status of each mailbox in that list.
The default for Roundcube is set to ``null``, meaning not cache
anything. In Kolab Groupware, the default is ``db`` (see below).
In many deployments, disk I/O on the IMAP server is a major concern and
possibly a bottleneck, so it is recommended to turn on caching.
If caching is not enabled, Roundcube will address IMAP directly every
time it needs metadata about IMAP folders.
Valid values include one of:
* **db**
Store IMAP caches in the database configured with
:ref:`admin_roundcube-settings_db_dsnw`.
In Kolab Groupware, this is made the default, as it does not
introduce any additional requirements to the environment.
Using the database for IMAP caches however does introduce a little
bit of overhead, for connections need to be made, authenticated,
databases selected, connections authorized, queries be executed,
authorized and awaited the answer for. That said, IMAP caches make
little use of the relational capabilities of such database.
* **apc**
Store IMAP caches in the *Alternative PHP Cache* (or "APC) -- the
memory segment(s) for PHP originally intended to store already
binary compiled PHP code, so that PHP does not need to read from
disk, interpret, compile and execute the PHP code every time a user
hits a page.
.. NOTE::
It is recommended to use APC for caching binary compiled PHP
code, but it is **not recommended** to use APC for IMAP caches.
* **memcache**
Store the IMAP caches in memcache, configured using
:ref:`admin_roundcube-settings_memcache_hosts`.
Memcache introduces far less overhead compared to a relational
database, and does not require authentication and authorization.
For larger deployments, this is the recommended setting. However,
you would need to configure memcache hosts, and making those highly
available is possible with replicated memcached daemons available
and supported only as part of Kolab Enterprise 13 and later
enterprise editions.

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