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In our environment, the replay on the standy database is not able to keep up with the speed at which the PRIMARY is able to process data. Our replay gaps often exceed 100 GB, and this means that any failover would be delayed. We use HADR for high availability and we cannot tolerate a downtime of more than a few minutes. Our primary database can process at around 75-100 MB per second but the replay on the standby maxes out at around 40 MB per second. This means that on busy days, we quickly build a large replay gap on the standby, and if a disaster was to occur and we needed to failover, it would take too long and cause major outages. We need the replay speed to be faster.
We also use the reads on standby feature for certain reporting functions, but we cannot tolerate a time difference between the primary and the standby of more than 30 minutes. Unfortunately, because of the large replay gap, the time difference between the PRIMARY and the STANDBY will often exceed the 30 minute threshold, causing those jobs to fail.
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