Mongodb entry-8 query 3 continue to learn about mongodb query $ or $ nor $ or, or the meaning is identified as long as there is a match. $ nor is opposite to $ or, as long as $ or can be found as the removed part. [html] db. user. find () {_ id: ObjectId (5198c286c686eb50e2c843b2), name: user0, age: 0} {_ id
The CPU cache query tool in Linux and the cpu cache query in linux
In Linux, you can use the following tool to query the CPU cache:
Method 1:
$ Lscpu
L1d cache: 32 K
Method 2:
$ cat /sys/devices/system/cpu/cpu0/cache/index0/size32K
$ cat /sys/devices/system/cpu/cpu0/cac
Nodejs connects to the mongodb database for addition, deletion, modification, and query
1. Install mongodb using the npm command
2. Install the mongodb Database
CRUD operation
We should have some knowledge about MongoDB before, and know some of its addition, deletion,
# Name:php+ajax website SEO query tool
# Author: Youth
[q:4908220]
# homepage:http://master8.net
Instructions for use:
1. The server must support at least one of the Allow_url_fopen,curl,fsockopen, please consult the server administrator for details.
2. Please respect the work of others! You can modify and use this program arbitrarily, but do not allow the public release after the modification! This p
1. find is used in MongoDB for query. You can specify the first parameter of find to perform all and partial queries. 1. querying all null query documents {} matches all the content of the set. If no query document is specified, the default query is {}. 2. Partial
Label:Recent projects need to use MONGODB, so downloaded the source of MongoDB on the internet, according to the sample written test code, but found a very strange problem: the speed of inserting records faster than the speed of data acquisition, and the most important problem is that the speed of data acquisition is unacceptable.Test scenario: Main Document storage personnel basic information, sub-document
1. find
MongoDB uses find for query. The query is to return a subset of the documents in a collection. The range of the child set is from 0 documents to the first parameter of the entire set. find.
Determines which documents are to be returned. The form is also a document that describes the details to be queried.
The empty qu
Alibaba Cloud SQL Intelligent Query analyzer, a database query and analysis management tool developed by delphi.
To facilitate your work, you can use a database query and analysis management tool developed by delphi to share with you the following features:
1. Due to the
without any parameters:Db.post.find ()Pretty () statementpretty () can make the results of the query output more aesthetically pleasing. Db.post.find (). Pretty ()And in MongoDBwhen multiple key-value pairs are passed in Find (), MongoDB handles them as an and query. Usage: Db.mycol.find ({key1:value1, key2:value2}). Pretty () Db.post.find ({"By": "Shiyanlou",
Magic MongoDB tool Tools is a MongoDB database Management Tools For simple database management work. This tool developed for the Chinese, Project address: Magicmongodbtool, currently the author has completed the basic function development. It is a MONGODB management
MONGDB Performance pressure test, random query, data volume 100 million records
Operating system centos6.4x64 bit
From the test results, when MongoDB all the data into memory, query speed according to the size of the document, performance bottlenecks are usually in the network traffic and CPU processing performance (in this test when all the data in memory, pur
neighbor net (neighbor. NET) project as an example, named "Neighbor": 8. A MongoDB database is now successfully created: 9. We try to create a new user table in a way that inserts the data, enter and select the following command, and then click on the "Execute" line button: Use neighbor; Db.user.save ({name: "Mac.manon", age:18}); 10. The following shows that a record has been successfully inserted into the database (and a user table is also
In the four CRUD operations, a record or document is obtained from the collection of mongodb databases. For non-DBAs, query is the most used. Therefore, if you have learned the query, it will be of great help for us to better operate the database in the future. You can use the following two methods to obtain a data or document from a collection in
To facilitate their own work, the use of Delphi developed a database query analysis management tools. Share to everyone, the following characteristics:1. Due to the use of ADO connection, the theory supports all databases such as SQL Server, Access, MySQL, Oracle, etc.2. Support SQL keyword automatic prompt3. Support automatic prompt for table name4. Support table field automatic prompt5. Support sq keyword, table name, field color display6. Support f
This article mainly introduces Thinkphp's multi-condition query method using mongodb, modified the mongodb driver file to implement composite query and multi-condition query, if you need it, you can refer to a project that uses the mongo
This article mainly introduces Thinkphp's multi-condition query method using mongodb database, modified the mongodb driver file to implement composite query and multi-condition query. if you need it, refer to MongoDBThinkPHP.
One project uses the
(Transferred from: http://www.cnblogs.com/zhuque/archive/2013/03/29/2988639.html)Mongotop, too.a built-in tool under the Mongodb-win32-x86_64-2.2.1\bin, Mongotopprovides a way to track an instance of MongoDB to see which amount of time is spent reading and writing data. Mongotop offersThe level of each collectionof statistical data. By default, Mongotop returns e
Label:Tool Recommendation: Robomongo, can self-Baidu to find the source of download, personal comparison recommended this tool, compared to Mongovue is more flexible.Collection Simple Query methodMongoDB syntax: Db.collection.find ()//collection is the name of the collection, which can be created on its own.Compare SQL statements: SELECT * FROM collection;Queries all the documents in the collection, that is
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.