Percona Server for MongoDB is an enhanced, open source, and highly-scalable database that is a fully-compatible, drop-in replacement for MongoDB 4.0 Community Edition. It supports MongoDB 4.0 protocols and drivers.
Percona Server for MongoDB extends Community Edition functionality by including the Percona Memory Engine storage engine, as well as several enterprise-grade features. It also includes MongoRocks storage engine (which is now deprecated). Percona Server for MongoDB requires no changes to MongoDB applications or code.
This release includes all features of MongoDB 4.0 Community Edition. Most notable among these are:
Multi-Document ACID transactions
Type conversion through the new aggregation operators
[*]Enhancements to the Change Streams support
Note that the MMAPv1 storage engine is deprecated in MongoDB 4.0 Community Edition.
In Percona Server for MongoDB 4.0.5-2, data at rest encryption becomes GA. The data at rest encryption feature now covers the temporary files used for external sorting and the rollback files. You can decrypt and examine the contents of the rollback files using the new perconadecrypt command line tool.
In this release, Percona Server for MongoDB supports the ngram full-text search engine. Thanks to Sunguck Lee (@SunguckLee) for this contribution. To enable the ngram full-text search engine, create an index passing ngram to the default_language parameter:
PSMDB-276: perconadecrypt tool is now available for decrypting the encrypted rollback files.
PSMDB-250: The Ngram full-text search engine has been added to Percona Server for MongoDB. Thanks to Sunguck Lee (@SunguckLee) for this contribution.
PSMDB-234: It was possible to use a key file for encryption the owner of which was not the owner of the mongod process.
PSMDB-273: When using data at rest encryption, temporary files for external sorting and rollback files were not encrypted
PSMDB-257: MongoDB could not be started with a group-readable key file owned by root.
PSMDB-272: mongos could crash when running the createBackup command.
Other bugs fixed: PSMDB-247
The Percona Server for MongoDB 4.0.5-2 release notes are available in the official documentation.