<listitem>

<para>

Specify the compression level to use. Zero means no compression.

For the custom archiveformat, this specifies compression of

For the customand directoryarchiveformats, this specifies compression of

individual table-data segments, and the default is to compress

at a moderate level.

For plain text output, setting a nonzero compression level causes

message text. In addition there are optional elements, the most

common of which is an error identifier code that follows the SQL spec's

SQLSTATE conventions.

<function>ereport</function> itself is just a shell macro, that exists

<function>ereport</function> itself is just a shell macro that exists

mainly for the syntactic convenience of making message generation

look like a single function call in the C source code. The only parameter

accepted directly by <function>ereport</function> is the severity level.