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commitTransaction¶
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Definition¶
-
commitTransaction
¶ New in version 4.0.
Saves the changes made by the operations in the multi-document transaction and ends the transaction.
Tip
In the mongo Shell, this command can also be run through the
Session.commitTransaction
helper methods.Helper methods are convenient for mongo users, but they may not return the same level of information as database commands. In cases where the convenience is not needed or the additional return fields are required, use the database command.
To run the
commitTransaction
, the command must be run against theadmin
database and run within aSession
.The command has the following syntax:
Behavior¶
Write Concern¶
When committing the transaction, the session uses the write concern
specified at the transaction start. See
Session.startTransaction()
.
If you commit using "w: 1"
write concern,
your transaction can be rolled back if there is a failover..
Atomicity¶
When a transaction commits, all data changes made in the transaction are saved and visible outside the transaction. That is, a transaction will not commit some of its changes while rolling back others.
Until a transaction commits, the data changes made in the transaction are not visible outside the transaction.
However, when a transaction writes to multiple shards, not all
outside read operations need to wait for the result of the committed
transaction to be visible across the shards. For example, if a
transaction is committed and write 1 is visible on shard A but write
2 is not yet visible on shard B, an outside read at read concern
"local"
can read the results of write 1 without
seeing write 2.