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Since the full SQL statements are cached in memory, memory usage may increase and affect the cache hit rate. As documented below, pg_stat_statements.max * track_activity_query_size bytes additional shared memory is required.
https://www.postgresql.jp/document/9.0/html/pgstatstatements.html
You may have to check the change in cache hit rate of the database and monitor for increasing wait events using RDS Performance Insights.
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