March 2019
Intermediate to advanced
394 pages
11h 4m
English
Content preview from Mastering MongoDB 4.x - Second Edition
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WiredTiger B-tree versus LSM indexes
B-tree is the most common data structure for indexes across different database systems. WiredTiger offers the option to use a Log Structured Merge (LSM) tree instead of a B-tree for indexing.
An LSM tree can provide better performance when we have a workload of random inserts that would otherwise overflow our page cache and start paging in data from disk to keep our index up to date.
LSM indexes can be selected from the command line like this:
> mongod --wiredTigerIndexConfigString "type=lsm,block_compressor=zlib"
The preceding command chooses lsm as type, and block_compressor is zlib for indexes in this mongod instance.
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