MongoDB是开源的,基于文本的数据库管理系统。 MongoDB is an open source, document-based database management system. MongoDB专为现代互联网应用程序的数据和可扩展性需求而设计,具有动态查询和辅助索引、快速的原子更新和复杂的聚合,并支持自动故障转移和分片的复制,以实现横向扩展。 二、第二章 MongoDB throu...
In this article, we will discuss the Replication Process in MongoDB. We will also learn about Replica Set, how to configure replication, and what is heartbeat in Replication in MongoDB.
gz. You can use gunzip command to decompress the files. Bzip2 - from the usability standpoint Bzip2 and Gzip are similar. But Bzip2 has much more degree of compression then the Gzip but it is also slower . You can use Bzip2 codec space priority is higher and the data will be rarely ...
Setting the Minimum Retention Period while the mongod is running, overrides any values that you may have set during its startup. You would have to update the value of the corresponding configuration file setting or command-line option to maintain those changes through a server restart. 3) Repli...
findAndModify command aggregateisn't the only function that gets to enjoy the benefits of the aggregation syntax. As ofMongoDB 4.2, a variety of commands support using aggregation pipelines to update documents. Let's take a look at just one command that does so:updateMany. ...
[root@MongoDB ~]# cat /etc/redhat-release CentOS release 6.9(Final) [root@MongoDB ~]# uname -r 2.6.32-696.el6.x86_64 [root@MongoDB ~]# /etc/init.d/iptables status iptables: Firewall is not running. [root@MongoDB ~]# getenforce ...
From MongoDB 4.4 on, it is possible to specify the least number of hours you want to preserve an oplog entry. Replica Set Reconfiguration Changes MongoDB 4.4 has a command calledreplSetReconfigthat allows addition or removal of not more than one voter at a time. Another new feature in Mo...
A database admin can read such logs with MongoDB's db.adminCommand(getLog: <value>) command or a plain text editor. This file format is classified as Simple text file. Related links: Log Messages MySQL (transaction log) by Oracle MySQL is an open source relational database management ...
Database (DBMS) Margaret Rouse Technology expert Margaret is an award-winning writer and educator known for her ability to explain complex technical topics to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technolo...
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