Last Modified Date: 07 Jan 2019
ResolutionWork with your database administrator to close out idle connections from the database side.
Tableau creates connection objects internally to establish connections to database servers. The settings below affect when Tableau creates connections, and when it allows those connections to become idle, but do not close connections.
To lower the number of connection objects created, increase the timeout of each connection object with the 'protocolcachelifetime_in_minutes' key.
For example, to set it to 240 minutes:
- On the computer running Tableau Server, open a command prompt as an administrator.
- Navigate to the Tableau Server bin folder, and enter the following command:
Versions 2018.1 and older using TabAdmin
tabadmin stop tabadmin set vizqlserver.protocolcachelifetime_in_minutes 240 tabadmin config tabadmin start
Versions 2018.2 and newer using TSM
tsm stop tsm configuration set -k vizqlserver.protocolcachelifetime_in_minutes -v 240 tsm pending-changes apply tsm start
CauseTableau Server keeps connections open in order to speed workbook load.
All connections in the cache have a time-since-last-used value. When a protocol is used, its timer is reset.
protocolcachelifetime_in_minutes limit is reached - the time since the connection was last used is greater than the protocol cache lifetime - the connection is marked as eligible to be closed.
On Tableau Server 10.5 and older versions, we checked for expired connections only when the protocol cache is accessed. Because of this, connections can linger on an idle server.
Tableau Server 2018.1 and newer versions regularly check the protocol cache for expired connections.
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