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  1. Core Server
  2. SERVER-5893

autoIndexId:true creates a non-unique index on _id

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    • Type: Icon: Bug Bug
    • Resolution: Duplicate
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: 2.0.1
    • Component/s: None
    • None
    • Linux

      According to http://www.mongodb.org/display/DOCS/Capped+Collections, setting autoIndexId:true should create a unique key index on the _id field (for replication of capped collections).

      My capped collection got a non-unique index on _id instead:

      > db.createCollection("myColl", {capped:true, size:536870912000, autoIndexId:true})
{ "ok" : 1 }
> db.myColl.getIndexes()
[
        {
                "v" : 1,
                "key" : {
                        "_id" : 1
                },
                "ns" : "dbname.myColl",
                "name" : "_id_"
        }
]

      If the unique index on _id is no longer needed, this might be a documentation bug.

            Assignee:
            scotthernandez Scott Hernandez (Inactive)
            Reporter:
            kevin@indeed.com Kevin Kwast
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              Created:
              Updated:
              Resolved: