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As a PostgreSQL database owner, you know that critical maintenance operations are handled by the autovacuum process. The effectiveness of this background process is constantly being improved with each release.
For most PostgreSQL users, the default settings will work just fine. However, some workloads and usage patterns require customized parameters. This vacuum requires multiple hours or days of downtime depending on database size.
Early warning is the key We now know that around 2. Although it can be monitored with manual queries, we have introduced an Amazon CloudWatch metric, MaximumUsedTransactionIDs, to make setting this kind of alert easier for you.
To generate this metric, the Amazon RDS agent runs this query: For some situations, a low severity warning at million might also be useful. Then choose Alarms on the navigation pane: Choose Create Alarm to create a new alarm: If you have several instances, you can group several together and get a single alarm.
After selecting your target instance, choose Next to set up the threshold: Then set up the threshold and notification email: This message will also show up in the CloudWatch dashboard: Setting this threshold to 1 billion should give you plenty of time to investigate the problem.
If the age of the oldest transaction is 1 billion, autovacuum is having a problem keeping this threshold at the target of million. There is nothing more frustrating than trying to fix this type of problem while keeping the system under normal workloads.
The monitor has sent an alarm—now what? One thing I like to do after I have identified the problem is to execute a verbose vacuum command and see how long the action takes.
This approach can help me get out of immediate trouble and plan my long-term fix. The three things to identify are: Where autovacuum is currently working.
Which database is aging. With this information, you can start to diagnose what is happening.About Accreditation. Research shows a direct correlation between high-quality early learning and children's positive long-term outcomes in life, including increased educational attainment, healthier lifestyles, and more successful careers.
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