MongoDB Concurrency

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prohaska edited this page Apr 15, 2013 · 20 revisions

This wiki describes the concurrency seen by MongoDB 2.4 applications.

Concurrency

MongoDB allows concurrent queries on any collection in any database

Query database(a).collection() || Query database(a).collection()
Query database(a).collection() || Query database(b).collection(), a != b

MongoDB does not allow concurrent insertions to the same database

Insert database(a).collection() blocks Insert database(a).collection()

MongoDB does allow concurrent insertions to different databases

Insert database(a).collection() || Insert database(b).collection(), a != b

MongoDB queries block insertions to the same database

Query database(a).collection() blocks Insert database(a).collection()

MongoDB insertions block queries in the same database

Insert database(a).collection() blocks Query database(a).collection()

MongoDB allows concurrent insertions and queries in different databases

Insert database(a).collection() || Query database(b).collection(), a != b
Query database(a).collection() || Insert database(b).collection(), a != b

MongoDB does not allow concurrent queries with dropping the collection

Query database(a).collection(b) blocks database(a).collection(b).drop