Re: How allowDiskUse is executed

From: Rhys Campbell <rhys.james.campbell@xxxxxxxxx>
To: mongodb-user <mongodb-user@xxxxxxxxxxxxxxxx>
Date: Thu, 28 Apr 2016 07:29:22 -0700 (PDT)
Why ads?
https://docs.mongodb.org/manual/reference/command/aggregate/

"Optional. Enables writing to temporary files. When set to true, 
aggregation stages can write data to the _tmp subdirectory in the dbPath 
<https://docs.mongodb.org/manual/reference/configuration-options/#storage.dbPath>
 directory."

Says can here so that's must mean only if it needs to. Related note take a 
look at this optimization...

https://docs.mongodb.org/manual/core/aggregation-pipeline-optimization/#sort-limit-coalescence

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Why ads?