{"id":51955,"date":"2022-07-31T07:00:14","date_gmt":"2022-07-31T07:00:14","guid":{"rendered":"https:\/\/dbtut.com\/?p=51955"},"modified":"2022-07-31T07:02:38","modified_gmt":"2022-07-31T07:02:38","slug":"fast-start-failover-data-guard","status":"publish","type":"post","link":"https:\/\/dbtut.com\/index.php\/2022\/07\/31\/fast-start-failover-data-guard\/","title":{"rendered":"Fast Start Failover Data Guard"},"content":{"rendered":"

In today’s article, I will tell you about Fast Start Failover Data Guard – OVERVIEW.<\/p>\n

Fast-start Failover It is a fast and automatic failover operation from Data Guard Broker or Cloud Control to the pre-selected Standby Database.<\/p>\n

The fact that it is automatic and fast increases High Availability by preventing the loss of time in manual intervention in the event of a disaster, and it can also create a handicap due to the fact that the control is out of DBA.<\/p>\n

In order to do this automation, there must be a component that knows many things and can manage the system accordingly. This component is Observer.<\/p>\n

It is an OCI (Oracle Call Interface) component that runs on Observer Client-Side.<\/p>\n

It runs on a separate host and monitors the availability of the primary database.<\/p>\n

There can only be one Observer monitoring the broker configuration.<\/p>\n

It can be managed from Observer Cloud Control or DGMGRL.<\/p>\n

It is installed by selecting the Administrator option from Oracle Universal Installer. While this setup activates management from DGMGRL, it does not activate Observer’s management from Cloud Control.<\/p>\n

For this, the Cloud Control Agent must also be installed. In addition, Oracle Software must be installed in order for DGMGRL to be activated.<\/p>\n

The big picture is briefly as follows.<\/p>\n

\"\"<\/p>\n

Fast-start Failover occurs when any of the following conditions occur.<\/p>\n

In case the connection between Primary and Observer is broken or the connection between Primary and Fast-start Failover Standby<\/p>\n

Database is broken and the specified threshold value is exceeded,<\/p>\n

In case of instance crash in single-instance database,<\/p>\n

In case all instances crash in the RAC system,<\/p>\n

When Shutdown Abort occurs in Primary Database,<\/p>\n

If the DBMS_DG.INITIATE_FS_FAILOVER function is called from one of the applications,<\/p>\n

When any of the following occurs as a result of database health-check,<\/p>\n

When Datafile goes offline,<\/p>\n

When Dictionary Corruption occurs in a critical database object,<\/p>\n

If the Control File is damaged due to a problem with the disk,<\/p>\n

In case LGWR process cannot write to Online Redo Logs,<\/p>\n

FAST START FAILOVER operation occurs if the archive process cannot create an archive due to lack of space in the relevant path.<\/p>\n

 <\/p>\n

In order to perform Fast-start Failover, some conditions must be met. These conditions are:<\/p>\n

Data Protection mode must be Maximum Availability or Maximum Performance.<\/p>\n

LogXptMode of Fast-start Failover Standby Database should be set to SYNC or FASTSYNC for Maximum Availability, ASYNC for Maximum Performance. If Far-Sync instance is used, Primary Database should be set as SYNC or FASTSYNC, while Standby Database should be set as ASYNC.<\/p>\n

Flashback must be activated in both Primary and Fast-start Failover Standby Database.<\/p>\n

Since the Observer will be on a separate host, the TNSNAMES.ORA file should be arranged accordingly.<\/p>\n

In order for Observer to restart databases automatically, a static listener must be created.<\/p>\n

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<\/div>\n","protected":false},"excerpt":{"rendered":"

In today’s article, I will tell you about Fast Start Failover Data Guard – OVERVIEW. Fast-start Failover It is a fast and automatic failover operation from Data Guard Broker or Cloud Control to the pre-selected Standby Database. The fact that it is automatic and fast increases High Availability by preventing the loss of time in …<\/p>\n

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<\/div>\n","protected":false},"author":484,"featured_media":51957,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-51955","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-oracle"],"aioseo_notices":[],"yoast_head":"\nFast Start Failover Data Guard - Database Tutorials<\/title>\n<meta name=\"description\" content=\"In today's article, I will tell you about Fast Start Failover Data Guard - OVERVIEW. 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