sokil

https://docs.mongodb.com/manual/reference/method/db.createCollection/ #151

https://github.com/phpbench/phpbench 1) Get benchmarks of PHPMongo, Doctrine and few others from https://docs.mongodb.com/ecosystem/drivers/php-libraries/#stand-alone-tools on different mongodb with different php engine 2) log performance changes of different versions of PHPMongo

https://sourcemaking.com/refactoring/extract-interface

Pessimistic locking

1

Add fields "session id" and "blocking ttl" Document which has actual date in "blocking ttl" - has lock for some "session id". No other document can't open or edit this...

http://habrahabr.ru/post/192870/

upsert entity

1

Maybe better this then setId/defineId? http://doctrine-mongodb-odm.readthedocs.org/en/latest/reference/upserting-documents.html