Mongodb chunk size settings, mongodbchunk

Mongodb chunk size settings, mongodbchunk

The default value is 64 MB. The value range is 1 MB to 1024 MB.

So what will the modification cause? The following table is a summary:

Chunk size adjustment	Splitting count (number of shards)	Cross-shard Data Count	Uniform Data	Network Transmission count	Migration count	Number of migration transmissions per time	Query speed
Increase	Decrease	Decrease	Uneven	Decrease	Decrease	Increase	Faster
Small	Increase	More	More even	More	More	Small	Slow down

When the data volume is large, consider the network bandwidth. If the bandwidth is found to be full, you can reduce the chunk size so that the transfer volume caused by migration will decrease.

When the server hardware is good, for example, my server cpu is 24 core, memory 256 GB, and disk is 96 TB. You need to increase the chunk size to reduce unnecessary parts.

The specific setting is to use commands instead of configuration files. For details, refer to the official documentation:

Http://docs.mongodb.org/manual/tutorial/modify-chunk-size-in-sharded-cluster/

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