"MongoDB" common knowledge points

1. modifying primary shards
   

Db.runcommand ({"Moveprimary": "DB", To: "Shard ID"});

2. Merging data blocks (data blocks need to be empty)

Db.runcommand ({"Mergechunks": "Db.collection", Bounds:[min_shardkey,max_shardkey]})

3. Get Data block size

Db.runcommand ({"DataSize": "Db.collection", "Keypattern": {shardkey:1}, Min:{sharkey:min},max:{shardkey:max}})

4. Get the split policy

Db.runcommand ({splitvector: "Db.collection", Keypattern: {sharkey:1}, maxchunksizebytes:10008864})

5. Repairing the database

Db.repairdatabase ()

6. Repairing Collections

Db.collection.runCommand ("compact")

7. Copy the database

Db.copydatabase ("Fromdb", "Todb", "Fromhost")

8. You should back up the configuration server's data before performing a cluster maintenance operation

9. One MONGOs process should be used per application server

10. Edit Slice Key: Export data, modify slice key, then import data

11. Import data before creating indexes more efficiently than creating indexes before importing data

This article is from the architect's path blog, so be sure to keep this source http://lizhuquan0769.blog.51cto.com/2591147/1767618

"MongoDB" common knowledge points