Restricts access to the database to one query at a time.
This setting is typically used for debugging or for problematic JDBC drivers.
If the system is being used mostly for read-only type activity, setting this to FALSE will improve the throughput to the database.
When set to TRUE, one query at a time can access the database.
When set to FALSE, multiple queries can access the database at a time.
Default setting is FALSE. (Default for version 4.5 and earlier was TRUE.)
Used as a configuration entry: