The Slow Queries. Slow Query Log Overview. Slow queries are the database queries which has a large turnaround time to access the required data.
Slow queries are those that take more time measured in seconds than they should based on the value stored in the server variable long_query_time. These queries tend to process a lot of data as compared. It is typically obvious when a window is opened and a component takes time before database data is displayed.
Whenever something is slow you can respond instantly to any individual query which exceeds the desired threshold.
To find the slow queries well need to log them either from Solr or from the application that queries it. By default this list is sorted by impact. The slow query log consists of SQL statements that take more than long_query_time seconds to execute and require at least min_examined_row_limit rows to be examined. List long-running and slow queries on PostgreSQL.