mongodb query performance

Query.with (New Sort (DIRECTION.ASC, "a", "B", "C")); (3) Different fields are sorted according to different List a ascending in descending order B Step three: Test class @Test public void Testlist () throws ParseException { pagemodel Query condition is cname=zcy The Skip method is to skip the number of bars, and is a single skip, if the collection is larger (such as a lot of pages) skip will be more and more

Single Data structure Redis enrich some, data manipulation aspect, Redis a little better, less network IO number of MongoDB support rich data expression, index, most similar relational database, support query language is very rich 3 , the size of the memory space, and the size of the data volume Redis in the 2.0 after the version has added its own VMS limits of physical memory, which can be Key Value Set t

displayed 9: Number of $size array elementsFor {name: ' David ', age:26, Favorite_number: [6, 7, 9]} record Match Db.users.find ({favorite_number: {$size: 3}}); Mismatch Db.users.find ({favorite_number: {$size: 2}}); The "$size" is also useful for querying arrays. Name implies. It can be used to query an array of a specific length.Like what: > Db.users.find ({favorite_number: {$size: 3}})Getting a document within a length range is a common

Label:For the MongoDB package is still continuing, for the continuous pursuit of simple programming continues, for like the Code of the feeling, still continue ... When your MONGO data table has sub-objects, especially the list objects, the use of the official driver is very uncomfortable, to remember a lot of new object types, trouble, so, to encapsulate it, let Getmodel support anonymous parameters! The table structure may be this way The statement

Tags: version ext orm DStar Mongovue mit. NET Rtti term the data structure to query for such as the following: take the Versionlimitlist field in the query as an example Mongooperations Tool class Query related statements the query validstarttime is greater than the current time, and the clientId in the Version

. When you are finished, restart the join replica set.3Slow Query(System.profile)DescriptionFor more information, see the following example: http://docs.mongodb.org/manual/reference/database-profiler/3.1: Parameter meaning{"OP" : "Query", #操作类型 with INSERT, query, update, remove, Getmore, command "NS" : "Onroad.route_model", #操作的集合 "

MongoDB query, index, and aggregationInitialize the mongodb Database > Use dengswitched to db deng> db. createCollection ("jingdong") # No parameter {"OK": 1}> show collectionsjingdongsystem. indexes> userdoc1 = ({"user_id": 1, "name": "cloud", "state": "active", "actor": "user ", "e-mail": "test@qq.com", "VM_num": 2, "time": [{"date": "", "hour ": "53 53 PM"}]})

The data structure to query is as follows:As an example of querying the Versionlimitlist fieldMongooperations Tool class Query related statementsEnquiry validstarttime is greater than the current time, and the clientId in the Versionlimitlist field The property value is 109 and the Platformcode property value is 2 Statements in the Mongovue{" validstarttime": { "$gt": Isodate ("2014-11-01t10:33

MongoDB 3.2 WiredTiger storage engine performance test MongoDB 3.2 was recently released. It uses WiredTiger as its default storage engine. Over the past five years, MongoDB has developed rapidly from its birth to its popularity. MongoDB 3.0 began to support the "pluggable s

(DIRECTION.ASC, "a", "B", "C"));(3) Different fields are sorted according to different List a ascending in descending order BStep three: Test class @Test public void Testlist () throws ParseException { pagemodelQuery condition is cname=zcy The Skip method is to skip the number of bars. And it's a one-way skip. Assuming that the collection is larger (such as a very large number of pages), skip will become slower, requiring many other processors (CPUs). This can aff

Tags: value pos ble table ali relational fuzzy query float precisionExact query:sql:field= "Value"mongo:{"field": "Value"}---------------------------------Fuzzy query: Match on both sides Right match Left match Sql: Field= "%value%" Field= "Value%" Field= "%value" Mongo: {"Field":/value/}{"Field":/.value/}{"Field":/.value.*/}

Tags: des io ar using SP on problem CTI ADHardware and Software EnvironmentMySQL version: 5.1.50, driver version: 5.1.6 (the latest 5.1.13 has a lot of assorted problems)MongoDB version: 1.6.2, driver version: 2.1Operating system: Windows XP SP3 (This effect should not be small)Cpu:intel Core2 E6550 2.33GMemory: 2G (Enough)MySQL startup parameters: Bin\mysqld--no-defaults--console--character-set-server=utf8--max_connections=1000--max_user_ connections

indexes in test table Db.test.fropIndexes (); Delete the name index from the test table Db.test.dropIndex ({name:1}); To parse an SQL statement using the index condition command: Db.test.find (). explain (); Performance optimization: Explain execution plan MongoDB provides a explain command to learn how a query request is handled by the system. The explain com