MongoDB Protocol

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prohaska edited this page Mar 21, 2013 · 5 revisions

This wiki captures the interaction between the mongo shell and mongod for various operations.

Create Database

Databases are created implicitly

Drop Database

Query <db>.$cmd dropDatabase
Query admin.$cmd replSetGetStatus

Create Collection

Query <db>.$cmd create <collection>, other attributes
Query admin.$cmd replSetGetStatus

Drop Collection

Query <db>.$cmd drop <collection>
Query admin.$cmd replSetGetStatus

Create Index

Insert <db>.system.indexes <collection>, index attributes
Query <db>.$cmd getlasterror
Query admin.$cmd replSetGetStatus

Drop Index

Query <db>.$cmd drop <collection>, <indexname>
Query admin.$cmd replSetGetStatus

Insert into a Collection

Insert <db>.<collection>, documents
Query <db>.$cmd getlasterror
Query admin.$cmd replSetGetStatus

Query a Collection

Query <db>.<collection>, query document, field selector document
- Reply cursor, documents
Query admin.$cmd replSetGetStatus

Show collections

Query <db>.system.namespaces, query document, field selector document
- Reply cursor, document
Query admin.$cmd replSetGetStatus

Count

Query <db>.$cmd, count <collection>, query document, field selector document
- Reply cursor, document
Query admin.$cmd replSetGetStatus
If the <collection> does not exist, the reply returns 0.