![]() From each row that is read, SQL Server then retrieves the columns that are required for the result set, as referenced by a SELECT statement, JOIN predicate, or filter predicate. When a query is executed and accesses data in row store tables, the execution tree operators and child operators read each required row, across all the columns specified in the table schema. Row mode execution is a query processing method used with traditional RDBMS tables, where data is stored in row format. The SQL Server Database Engine can process Transact-SQL statements using two distinct processing modes: The following topics cover how SQL Server processes queries and optimizes query reuse through execution plan caching. The SQL Server Database Engine processes queries on various data storage architectures such as local tables, partitioned tables, and tables distributed across multiple servers. ![]() ![]() Applies to: SQL Server (all supported versions) Azure SQL Database ![]()
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