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High Availability Disaster Recovery (HADR)

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High Availability Disaster Recovery (HADR)

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  1. High Availability Disaster Recovery (HADR) High availability catastrophe recuperation (HADR) offers a excessive availability answer for each partial and whole webweb page failures. HADR protects towards information loss with the aid of using replicating information adjustments from a supply database, known as the number one database, to the goal databases, known as the standby databases. HADR helps up to a few faraway standby servers. A partial webweb page failure may be due to a hardware, network, or software (Db2® database device or running device) failure. Without HADR, a partial webweb page failure calls for restarting the database control device (DBMS) server that includes the database. The duration of time that it takes to restart the database and the server wherein it's miles positioned is unpredictable. It can take numerous mins earlier than the database is added returned to a constant country and made available. With HADR, a standby database can take over in seconds. Further, you may redirect the customers that used the authentic number one database to the brand new number one database with the aid of using the use of computerized patron reroute or retry good judgment withinside the application. A whole webweb page failure can arise while a catastrophe, together with a fire, reasons the complete webweb page to be destroyed. However, due to the fact HADR makes use of TCP/IP for conversation among the number one and standby databases, they may be located in distinct locations. For example, the number one database is probably positioned at your head workplace in a single city, and a standby database is probably positioned at your income workplace in every other city. If a catastrophe happens on the number one webweb page, information availability is maintained with the aid of using having the faraway

  2. standby database take over because the number one database with complete Db2 functionality. After a takeover operation happens, you may carry the authentic number one database returned up and go back it to its number one database status; that is referred to as failback. You can provoke a failback if you may make the vintage number one database constant with the brand new number one database. After you reintegrate the vintage number one database into the HADR setup as a standby database, you may transfer the jobs of the databases to allow the authentic number one database to yet again be the number one database. With HADR, you base the extent of safety from ability lack of information in your configuration and topology selections. Some of the important thing selections which you should make are as follows: What stage of synchronization will you operate? Standby databases are synchronized with the number one database thru log information this is generated at the number one and shipped to the standbys. The standbys continuously roll ahead thru the logs. You can pick out from 4 distinct synchronization modes. In order of maximum to least safety, those are SYNC, NEARSYNC, ASYNC, and SUPERASYNC. Will you operate a peer window? The peer window characteristic specifies that the number one and standby databases are to act as aleven though they're nevertheless in peer country for a configured quantity of time if the number one loses the HADR connection in peer country. If number one fails in peer or this disconnected peer country, the failover to standby happens with 0 information loss. This characteristic offers the finest safety.

  3. How many standbys will you deploy? With HADR, you may dissipate to a few standby databases. With a couple of standbys, you may reap each your excessive availability and catastrophe recuperation targets with a unmarried technology. For extra information, see HADR a couple of standby databases. Do you want to combine HADR with Db2 pureScale® The Db2 pureScale feature offers outstanding availability and scalability and can now be combined with HADR to meet both your high availability and disaster recovery needs. For more information, see High availability disaster recovery (HADR) in Db2 pureScale environments. Table 1 contains an overview of what HADR functionality is supported by each type of HADR setup. Functionality or Principal Auxiliary Principal standby in a Db2 feature standby standby pureScale environment Synchronization modeAll modes SUPERASYNC All modes are supported are mode only supported Reads on standby Supported Supported Not supported Delayed replay Supported Supported Supported

  4. Functionality or Principal Auxiliary Principal standby in a Db2 feature standby standby pureScale environment Log spooling Supported Supported Supported Tivoli SA MP as Supported Not supported Not supported cluster manager for automated failover to HADR standby Peer window Supported Not supported Not supported Network address Supported Supported Not supported translation (NAT) Automatic client Supported Supported Supported reroute (ACR) Client affinities N/A N/A Supported

  5. HADR might be your best option if most or all data in your database requires protection or if you perform DDL operations that must be automatically replicated on a standby database. However, HADR is only one of several replication solutions that are offered in the Db2 product family. The InfoSphere® Federation Server software and the Db2 database system include SQL replication and Q replication solutions that you can also use, in some configurations, to provide high availability. These solutions maintain logically consistent copies of database tables at multiple locations. In addition, they provide flexibility and complex functionality such as support for column and row filtering, data transformation, and updates to any copy of a table. You can also use these solutions in partitioned database environments. In IBM Data Studio Version 3.1 or later, you can use the task assistant for setting up HADR. Task assistants can guide you through the process of setting options, reviewing the automatically generated commands to perform the task, and running these commands. For more details, see administering databases with task assistants. For More Information about Cloud DBA Online Training Click here Contact: +91 9989971070

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