Manual:$wgIgnoreSQLErrors

Debug: $wgIgnoreSQLErrors
Whether to disable automatic generation of "we're sorry, but there has been a database error" pages.
Introduced in version:1.3.0
Removed in version:1.4.0 (r7376)
Allowed values:(boolean)
Default value:false

Details

Whether to disable automatic generation of "we're sorry, but there has been a database error" pages.

This was replaced by $wgShowSQLErrors in 1.4.0