mongodb performance issues

are settings, there are two ways to set the method and level, one is to add the –slowms boot parameter configuration. The second is to add the second parameter when calling Db.setprofilinglevel: Db.setprofilinglevel (level, slowms) db.setprofilinglevel (1, 10);2. Query Profiling RecordsUnlike MySQL's slow query log, MongoDB profile records are directly present in the system DB, recording location system.profile, so we can only query this collection r

Query (table 300 million data): Simultaneous connection number op/s3 8K5 10K8 16K20K25K32K40K48K57KThe memory even index cannot be completely lowered: Cache:data = 1:10 Query (table 300 million data): Simultaneous connection number op/s3 3.4K5 4.5K8 9.3K11K14K20K24K25K34K(Click to view larger image)The index is all in memory:Cache:data is 4:10The index is not all in memoryCache:data is 1:10 Memory is large enough, the CPU is the bottleneck, the better the CPU

Traditional SQL pagingIn traditional SQL paging, almost no row_number exists in all solutions. For scenarios that require various sorting and complex queries, row_number is a killer. In addition, the time stamp is usually used for paging loading by poll/push on the current web. These two types of pages can be said to be generic, and even the pages generated by Linq are row_number. The latter is the best both in terms of performance and complexity, bec

The topic is not very accurate, because the database does not provide paging , ranking and other functions, providing only data access, page ranking these are our database-based practical cases only. However, whether it is Redis or MongoDB, there are usually some common ways to do paging and ranking. This article introduces some test data to show you the performance difference between Redis and

default setting, there are two kinds of setting method and level, one is by adding –slowms boot parameter configuration. The second is to invoke Db.setprofilinglevel with the second argument: Db.setprofilinglevel (level, slowms) db.setprofilinglevel (1, 10); 2. Query Profiling Records Unlike MySQL's slow query log, the MongoDB profile record is directly present in the system DB, and the record location is System.profile, so we'll just h

Tags: build one Mon code BSP Hong Kong LAN Time docProblem: Different countries, the use of different time zones, and server code in the country, across time zone date, based on the date query, no data query The 1.mongodb stored new date () is the UTC time, which is the time of the 0 time zone, world standard Time 2. Refer to Moment official website, time zone problem: http://momentjs.com/timezone/docs/ npm install moment-timezone var moment = require

performance and business to set), so set a big meaningless. If you set a reasonable value, you reach this value and MongoDB the new connection request to avoid being dragged down by too many connections.2.indexcounters:btree:misses index of the number of misses, and the ratio of hits to consider whether the index is correctly established. You see my "missratio": 3.543930204420982e-7, very healthy bar. So t

Use Yii2-mongodb in the YII2 inside the main to improve which piece of performance? Reply content: Use Yii2-mongodb in the YII2 inside the main to improve which piece of performance? MongoDB is a NoSQLMySQL is the traditional dbAs for the

MongoDB version 3.2 Wiredtiger storage engine performance test Chszs, not allowed to reprint without Bo master. Permission to reprint should be marked by the author and blog home: Http://blog.csdn.net/chszsMongoDB 3.2 was recently released, and it uses Wiredtiger as its default storage engine. Over the past five years, MongoDB has evolved from birth to popularity

, "IsEOF": 1, "Invalidates": 0, "Direction": "Forward", "Docsexamined": 866283 }, "TS": Isodate ("2016-06-04t03:57:10.206z"), "Client": "127.0.0.1", "AllUsers": [ ], "User": ""}Use the following command to view the latest recordsDb.system.profile.find (). Sort ({$natural:-1})There is also a more concise way to viewShow profileThis command can view the last 5 recordsThe information content provided by profile is explainedTS: When the command i

, although indexes can speed up query performance for a database, additional space is required to hold index data, and it becomes less efficient when inserting and updating data (you need to update the index table at the same time). Therefore, the creation of the index table needs to be based on the actual business situation, not the more index table the better.Type unique index of the indexA unique index guarantees that the specified value for each d

When a new Web machine node is added to the project, the performance of its MongoDB cluster is found to be impacted, at the peak of the request, and the MongoDB response time becomes very long. Monitoring found that the number of connections MongoDB at peak times reached around 1100~1500, which resulted in considerabl

When $ or and sort () are used in MongoDB, a solution with poor query performance is mentioned in the previous article. when $ or and sort () are used in MongoDB, query performance may be poor. for details, refer to mongodb's plan. this bug may be modified in version 2.5.w. I encountered this problem in my project, and

In MongoDB, you can use the Db.collection.explain ("executionstats") statement to analyze query performance. Create the table inventory in MongoDB and insert the test data, the initial data in addition to the ID field is not indexed. {"_id": 1, "item": "F1", type: "Food", quantity:500} {"_id": 2, "item": "F2", type: "Food", quantity:100} {"_id": 3, "item": "P1"

In YII2, which one of the main performance can be improved by using yii2-mongodb? In YII2, which one of the main performance can be improved by using yii2-mongodb? Reply content: In YII2, which one of the main performance can be improved by using yii2-

ObjectiveThe promotion of WEB 2.0 applications brings a whole new experience to the user, while also giving developers more attention to client performance issues. Recently, one of the founders of Dynatrace , a veteran Web Performance diagnostic expert and well-known tool , Andreas grabner According to their work experience, summed up the Web 2.0 application Cli

Five big Linux simple commands to resolve system performance issues 2010-12-17 10:07 James Turnbull techtarget Chinafont Size:T | T Managing the performance of a Linux host often looks like a magic trick. Many administrators often simplify processing when encountering performance problems, relying on hardware upgrades

time to solve the problem. In particular, the key service host services, such as DNS host, RADIUS authentication host, Mail gateway and other important equipment is reaching. Once there is a problem with the virtual center, managers are at a loss to find the underlying problem quickly and efficiently.Addressing the root causes of today's applications and virtualized infrastructures requires visibility into application services, networks, and virtualized architectures that apply to the various d