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

Modify Primary Fragment

db.runCommand({"movePrimary":"db", to:"fragment id"});

2. Merge blocks (blocks need to be empty)

db.runCommand({"mergeChunks":"db.collection", bounds:[min_shardkey,max_shardkey]})

3. Get block size

db.runCommand({"dataSize":"db.collection","keyPattern":{shardkey:1}, min:{sharkey:min},max:{shardkey:max}})

4. Get segmentation policy

db.runCommand({splitVector: "db.collection", keyPattern: {sharkey:1}, maxChunkSizeBytes: 10008864})

5. repair the database

db.repairDatabase()

6. repair set

db.collection.runCommand("compact")

7. Copy database

db.copyDatabase("fromdb", "todb", "fromhost")

8. Backup the configuration server data before performing cluster maintenance operations

9. There should be one mongos process per application server

10. modifier keys: export data, modifier keys, then import data

11. Importing data before creating an index is more efficient than creating an index before importing data

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