Sign up. Term of the Day. Best of Techopedia weekly. News and Special Offers occasional. Database Clustering. What Does Database Clustering Mean? Techopedia Explains Database Clustering Database clustering offers two major advantages, especially in high-volume database environments: Fault Tolerance Because there is more than one server or instance for users to connect to, clustering offers an alternative, in the event of individual server failure.
Load Balancing The clustering feature is usually set up to allow users to be automatically allocated to the server with the least load. Synonyms Database Cluster. Share this Term. Tech moves fast! If any offer or any sale is occurring on a site, then a lot of users customers of the application are connected. Connections are processed to the HTTP web server and then to the database server. As a result, lots of queries from the webserver have been executed on the single database server.
This may result in a very slow response from the site to the user. In such cases, the organization may implement a database cluster if the clients develop or host the business site. By using this technique, the organization may not have to face the issue of the high response time issue. This clustering plays an important role in serving e-commerce applications, where the requests are scattered over the group of database clusters and sent back to the client efficiently via a HTTP server.
One important feature in this cluster is a database management system, which works to retrieve back requests from many nodes within a distribution through a single request from the user.
This overcomes complex query issues and optimizes distributed query responses. In a load-balanced environment, load balancers connect the web to database clusters. In these instances, the load, which comes from an external database query request from the HTTP server, gets sent over a single database server, unless it touches the specific threshold values.
The main advantage in load balancing is that the application accesses the database server via an IP address which belongs to the load balancer. The server then replies by progressing the output to the web server and the web server to the client. Despite all of these technology distributions at the back-end, it appears to be a single system to the user.
The scope of clusters varies from enterprise to enterprise, depending on the kind of processes and level of performance required. More from this Author. This site uses Akismet to reduce spam. Learn how your comment data is processed. Choosing a Global Software Development Partner to Accelerate Your Digital Strategy To be successful and outpace the competition, you need a software development partner that excels in exactly the type of digital projects you are now faced with accelerating, and in the most cost effective and optimized way possible.
Get the Guide. If you choose to do this, it is not advisable to try to use the secondary volume's topmost directory mount point as the data directory. Best practice is to create a directory within the mount-point directory that is owned by the PostgreSQL user, and then create the data directory within that.
Many installations create their database clusters on network file systems. Specifically, delayed asynchronous writes to the NFS server can cause data corruption problems. If possible, mount the NFS file system synchronously without caching to avoid this hazard. Also, soft-mounting the NFS file system is not recommended. It's advisable to consult the vendor's documentation concerning data consistency guarantees.
PostgreSQL cannot be more reliable than the file system it's using. Development Versions: devel. Unsupported versions: 9. This documentation is for an unsupported version of PostgreSQL. You may want to view the same page for the current version, or one of the other supported versions listed above instead.
PostgreSQL 9. Server Setup and Operation Next. Creating a Database Cluster Before you can do anything, you must initialize a database storage area on disk. Use of Secondary File Systems Many installations create their database clusters on file systems volumes other than the machine's "root" volume.
0コメント