default write concern mongodb

MongoDB Write attentionMongoDB provides write attention to the level of assurance used to describe the return information of a database write operation. The intensity of the written attention determines the level of assurance. When inserting,

Write concern guarantees the level of MongoDB write operations, the different write concern settings correspond to different levels of writes, the higher the level of setting, the better the performance of the write operation is done, but the worse

Write concern guarantees the level of MongoDB write operations, and different write concern settings correspond to different levels of writes. The higher the level you set. The better the performance of the write operation is, the worse the write

Originally used connect-mongo , may be the Express version of the upgrade error, instead connect-mongodb , but after the use of the following warning:G:\nodejs\moviesite>gruntrunning "Concurrent:tasks" (concurrent) Task Running "Nodemon:dev"

The storage Engine (Storage) is the core component of MongoDB, responsible for managing how data is stored on the hard disk and memory. Starting with the MongoDB 3.2 release, MongoDB supports the multi-data storage engine (Storage engines), and

MongoDBNode. js driver is officially supported by the native Node. js driver. It is the best implementation so far and has been officially supported by MongoDB. The MongoDB team has adopted the MongoDBNode. js driver as the standard method.

MongoDB 3.0 Security Permission access controlMongoDB 3.0 access control has changed a lot, you need to pay attention to this parameter authenticationmechanisms. To use the 2.6 version, I directly specify the following

About five or six years ago, for the first time, it was a nosql that was already hot topic. But at that time the use of mysql,nosql for me is still new things, and not really use, just unknown. But the impression is such a picture (later Google to

Environment: MongoDB version: 2.4.6,replica SetDemand: Primary pressure is too high, expect secondary share reading pressureObjectiveFrom an application perspective, it is much like using replica Set and using a single MONGO. The default driver

About five or six years ago, for the first time, it was a nosql that was already hot topic. But at that time the use of mysql,nosql for me is still new things, and not really use, just unknown. But the impression is such a picture (later Google to