March 2019
Intermediate to advanced
394 pages
11h 4m
English
Content preview from Mastering MongoDB 4.x - Second Edition
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MMAPv1
With the introduction of WiredTiger and its many benefits, such as document-level locking, many MongoDB users are questioning whether it's worth discussing MMAPv1 anymore.
In reality, the only cases where we should consider using MMAPv1 instead of WiredTiger would be the following:
- Legacy systems: If we have a system that fits our needs, we may upgrade to MongoDB 3.0+ and not transition to WiredTiger.
- Version downgrade: Once we upgrade to MongoDB 3.0+ and convert our storage to WiredTiger, we cannot downgrade to a version lower than 2.6.8. This should be kept in mind if we want the flexibility to downgrade at a later time.
As shown previously, WiredTiger is a better choice than MMAPv1, and we should use it whenever we get the chance. ...
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