4/8/2023 0 Comments Aurora postgresqlThere is a feature request pending with engineering teams to preserve the stats after reboot. This is a known bug in Aurora PostgreSQL. “Unfortunately, the monitoring stats like ‘pg_stat_all_tables’ and ‘pg_stat_user_tables’ gets reset after an instance reboot but the data distribution stats will not be impacted. To interact with the Aurora database cluster, you will use an Amazon EC2 Linux instance that acts like a. Regarding this bug, the Amazon Aurora team states: Connect to your Aurora PostgreSQL DB cluster. The distribution stats are the ones that track distribution of data – number of distinct values, most common values in the column, histogram of data etc., which are more durably stored in the database. The pg_stat_ and pg_statio_ tables fall into this category. Version: 7.3 Language: English (United States). The monitoring stats are the ones that get reset by calling pg_stat_reset(). Amazon Web Services (AWS) Aurora / PostgreSQL Database (via JDBC) - Import - 7.3. Aurora gives you the performance and availability of commercial-grade databases at one-tenth the cost. ![]() To learn more about Aurora in general, see What is Amazon Aurora. Amazon Aurora is a relational database management system (RDBMS) built for the cloud with full MySQL and PostgreSQL compatibility. So until this is fixed, you need to run vacuum analyze on all your tables whenever you reboot, or the autovacuum daemon will think that vacuum was never done. Aurora PostgreSQL is a drop-in replacement for PostgreSQL and makes it simple and cost-effective to set up, operate, and scale your new and existing PostgreSQL deployments, thus freeing you to focus on your business and applications. As of this date, April 27, 2020, these are the versions of the Aurora engine that have this bug: What is promised in Babelfish is that it will create a layer. What is interesting is that a direct port of SQL Server to PostgreSQL or Aurora PostgreSQL can be challenging due to incompatibilities in data types, and in functions. This does not work however for the current aurora engine versions for PostgreSQL. Amazon goes after Microsoft’s SQL Server with Babelfish for Aurora PostgreSQL. after immediate shutdown, server crash, and point-in-time recovery), all statistics counters are reset.” When recovery is performed at server start (e.g. ![]() “When the server shuts down cleanly, a permanent copy of the statistics data is stored in the pg_stat subdirectory, so that statistics can be retained across server restarts. Official PostgreSQL documentation states that if you do a normal shutdown, both distribution and monitoring stats will still be there when you restart your instance ( Monitoring Stats): ![]() If you reboot your PostgreSQL aurora instance, your distribution stats will still be there, but your monitoring stats will not. Amazon Aurora Amazon Aurora is a MySQL and PostgreSQL-compatible relational database engine built for the cloud that combines the speed and availability of.
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