MongoDB entry and deletion change to build an index

Basic Operation command Show DBS//View all libraries using test//Use library without words automatically create show collections//view created table add Db.test_collection.insert (); Key value pair JSON data for (i=3;i<100;i++) Db.test_collection.insert ({_id:i,x:i})//Loop Add find Db.test_collection.find (); Find all fields Db.test_collection.find ({_id:1})//Condition Lookup Db.test_collection.find (). Count (); Statistics number Db.test_collection.find (). Skip (3). Limit (5). Sort ({_id:1}); Filter out the first three, limit 5, Sort by ID update db.test_collection.update ({x:45},{x:888}); Db.test_collection.update ({x:100},{$set: {y:888}},{z:100}); Specify field modification Db.test_collection.update ({y:100},{y:999},true)//If the data found does not exist then it will be written to multiple data modifications by default only the first bar is modified Db.test_ Collection.update ({c:1},{$set: {c:2}},false,true) prevents misoperation to delete db.test_collection.remove ({c:2}) only with Set update; Delete Table Db.test_collection.drop (); Add index Db.test_collection.ensureIndex ({x:1}); Single-key index view index db.test_collection.getIndexes (); Multi-key index Db.test_collection.insert ({x:[1,3,4,5]}) composite index db.test_collection. Ensureindex ({x:1,y:1}) expired index Db.test_ Collection. Ensureindex ({time:1},{expireafterseconds:10}), ExpireafterseConds: Full-text retrieval of seconds
Db.test.find ({$text: {$search: "CC"}}) Db.test.find ({$text: {$search: "AA bb cc"}}) by default is | | Db.test.find ({$text: {$search: "AA Bb-cc"}}) does not contain the CC string Db.test.find ({$text: {$search: "\" aa\ "\" bb\ "\" Cc\ "}}) default is & &
Full-Text Search similarity query Db.test.find ({$text: {$search: "cc SS"}},{score:{$meta: "Textscore"}}) split-rate, you can sort Db.test.find ({$text: {$ Search: "cc ss"}},{score:{$meta: "Textscore"}). Sort ({score:{$meta: "Textscore"}) see personal notes for details
Http://note.youdao.com/noteshare?id=c4c9cb4e6d708ce6e9784146098a1e7a&sub=5AF0A02626B0433B9AB7D9993D1602EA