Description: Logical reads refer to the number of pages that have been read from the database cache during the execution of an SQL query. This concept is fundamental in the realm of query optimization, as a lower number of logical reads indicates more efficient data access. When a query is executed, the database management system (DBMS) attempts to minimize disk access, which is a slower process, by using memory cache to temporarily store the most frequently used data pages. Logical reads are, therefore, a key performance indicator for a query, as they reflect how effectively the DBMS can retrieve information without needing to access the hard disk. A high number of logical reads may suggest that the query is not optimized, potentially leading to slower response times and inefficient use of system resources. Therefore, developers and database administrators should pay attention to this parameter when analyzing and tuning their SQL queries to improve the overall performance of applications that rely on various database systems.
