Shulou(Shulou.com)06/01 Report--

When all query writes are written with a timeout as far as possible, use the batch API to build indexes as much as possible, which will have a certain impact on write performance, so when building indexes, several public fields that can cover most of the data shall prevail. It is really necessary to add some uncovered fields to create a new index. When accessing the replica set, make sure that all the machines in the replica set are included in the MongoDB URI for load balancing and high availability. When accessing the sharding cluster, make sure that the MongoDB URI contains 2 or more mongos addresses to achieve load balancing and high availability. Combinatorial index field order: don't be afraid of data redundancy after matching conditions, but if the data values of a field often change, it is not suitable to be redundant to other documents or collections. To be added.

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