Oracle Data Guard and Database Incarnations

// Data Guard // Database Incarnations // Standby Logs applying in Alert Log but not in V$ARCHIVED_LOG

Over the past week I’ve been getting a great introduction to the practical workings of Data Guard. In the past I’ve worked a lot with Disaster Recovery systems built using Oracle standard edition and therefore not licensed to use Data Guard and in those circumstances a poor man’s version of the system was put in place by using RSYNC to synchronise archive logs between a production database and a DR database. With the logs in place, a script run on a schedule would recover the data from the logs. It turns out that the concept of Data Guard is pretty similar in that it’s basically about getting archive logs to the right place and setting the destination database into a mode where it can read those logs and be ready for when disaster strikes.

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