</para>

<para>

CFS provides the following configuration parameters:

You can configure CFS using data compression configuration parameters.

For details, see <xref linkend="runtime-config-cfs">.

</para>

<variablelist>

<varlistentry id="cfs-encryption" xreflabel="cfs_encryption">

<term><varname>cfs_encryption</varname> (<type>boolean</type>)

<indexterm>

<primary><varname>cfs_encryption</> configuration parameter</primary>

</indexterm>

</term>

<listitem>

<para>

Enables encryption of compressed pages. Switched off by default.

</para>

</listitem>

</varlistentry>

<varlistentry id="cfs-gc-workers" xreflabel="cfs_gc_workers">

<term><varname>cfs_gc_workers</varname> (<type>integer</type>)

<indexterm>

<primary><varname>cfs_gc_workers</> configuration parameter</primary>

</indexterm>

</term>

<listitem>

<para>

Number of CFS background garbage collection workers (default: 1).

</para>

</listitem>

</varlistentry>

<varlistentry id="cfs-gc-threshold" xreflabel="cfs_gc_threshold">

<term><varname>cfs_gc_threshold</varname> (<type>integer</type>)

<indexterm>

<primary><varname>cfs_gc_threshold</> configuration parameter</primary>

</indexterm>

</term>

<listitem>

<para>

Percent of garbage in file after which file should be compactified (default: 50%).

</para>

</listitem>

</varlistentry>

<varlistentry id="cfs-gc-period" xreflabel="cfs_gc_period">

<term><varname>cfs_gc_period</varname> (<type>integer</type>)

<indexterm>

<primary><varname>cfs_gc_period</> configuration parameter</primary>

</indexterm>

</term>

<listitem>

<para>

Interval in milliseconds between CFS garbage collection iterations (default: 5 seconds)

</para>

</listitem>

</varlistentry>

<varlistentry id="cfs-gc-delay" xreflabel="cfs_gc_delay">

<term><varname>cfs_gc_delay</varname> (<type>integer</type>)

<indexterm>

<primary><varname>cfs_gc_delay</> configuration parameter</primary>

</indexterm>

</term>

<listitem>

<para>

Delay in milliseconds between files defragmentation (default: 0)

</para>

</listitem>

</varlistentry>

<varlistentry id="cfs-level" xreflabel="cfs_level">

<term><varname>cfs_level</varname> (<type>integer</type>)

<indexterm>

<primary><varname>cfs_level</> configuration parameter</primary>

</indexterm>

</term>

<listitem>

<para>

CFS compression level (default: 1). 0 is no compression, 1 is fastest compression.

Maximal compression level depends on particular compression algorithm: 9 for zlib, 19 for zstd...

</para>

</listitem>

</varlistentry>

</variablelist>

<para>

By default CFS is configured with one background worker performing garbage collection.

Garbage collector traverses tablespace directory, locating map files in it and checking percent of garbage in this file.