CHAPTER 14Handling Online Redo Log Failures

One of us worked for a company that had just implemented an expensive database server with redundancy built into every component, or so we thought. We were using RAID disks for all database files and the online redo log groups. We were confident that there was minimal risk of failure with these disks.

Therefore, we decided not to multiplex the online redo log groups. A few days later, an inexpensive battery that maintained the cache for a disk controller failed. This caused corruption in the current online redo log group. As a result, we lost data, experienced downtime, and had to perform an incomplete recovery.

How Redo Logs Work

Online redo logs store a record of transactions that have occurred in ...

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