.. _PSMDB-4.0.19-12:

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*Percona Server for MongoDB* 4.0.19-12
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:Date: June 24, 2020
:Installation: `Installing Percona Server for MongoDB <https://www.percona.com/doc/percona-server-for-mongodb/4.0/install/index.html>`_

Percona Server for MongoDB 4.0.19-12 is an enhanced, open source, and highly-scalable database that is a
fully-compatible, drop-in replacement for `MongoDB 4.0.19 Community Edition <https://docs.mongodb.com/v4.0/release-notes/4.0/#jun-15-2020>`_.
It supports MongoDB 4.0.19 protocols and drivers.

New Features
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* :jirabug:`PSMDB-587`: Add options to control the size of several WiredTiger hash arrays concerned with data handles and one for session cursor cache
* :jirabug:`PSMDB-616`: Add "txn_checkpoint_prepare_time" and "txn_checkpoint_tree_helper_time" wiredTiger.transaction stats
* :jirabug:`PSMDB-582`: Added Kerberos authentication to Percona Server for MongoDB



Bugs Fixed
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* :jirabug:`PSMDB-600`: Fix leak of dhandle session_inuse counter in __evict_walk through 'error' early loop exit logic