<ul><li>Postgres_get_av_diag() is a function available in Amazon RDS for PostgreSQL used for monitoring autovacuum.</li><li>Autovacuum performs a special purpose operation called freezing to prevent transaction ID (XID) wraparound.</li><li>Autovacuum can lag for various reasons, such as long-running transactions.</li><li>postgres_get_av_diag() identifies blockers beyond the adaptive autovacuum threshold.</li><li>It prevents premature alerts and adapts to higher custom settings.</li><li>A Python-based Lambda function uses postgres_get_av_diag() to identify and report aggressive autovacuum blockers.</li><li>It also logs the results to CloudWatch and sends email alerts using Amazon Simple Email Service when blocks are detected.</li><li>Amazon EventBridge schedules periodic execution of the Lambda function.</li><li>This monitoring solution can mitigate the risk of transaction ID wraparound and prevent downtime.</li><li>Postgres_get_av_diag() function is supported in Amazon RDS for PostgreSQL version 17.1 and higher.</li></ul>

Prevent transaction ID wraparound by using postgres_get_av_diag() for monitoring autovacuum

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