Block Nested Loop=Off at Stephanie Villarreal blog

Block Nested Loop=Off. By default, mysql employs hash joins whenever possible. Using join buffer (block nested loop) means the join is unable to use an index, and it's doing the join the hard way. The block_nested_loop flag of the optimizer_switch system variable controls hash joins. The block_nested_loop and batched_key_access flags of the optimizer_switch system variable control how the optimizer uses. It is possible to control whether hash joins are employed using one of the bnl and. See section 10.9.2, “switchable optimizations”. By default, block_nested_loop is on and batched_key_access is off. Block_nested_loop (default on) controls use of bnl join algorithm.

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By default, block_nested_loop is on and batched_key_access is off. The block_nested_loop and batched_key_access flags of the optimizer_switch system variable control how the optimizer uses. Using join buffer (block nested loop) means the join is unable to use an index, and it's doing the join the hard way. See section 10.9.2, “switchable optimizations”. Block_nested_loop (default on) controls use of bnl join algorithm. It is possible to control whether hash joins are employed using one of the bnl and. By default, mysql employs hash joins whenever possible. The block_nested_loop flag of the optimizer_switch system variable controls hash joins.

PPT Query processing and optimization PowerPoint Presentation, free

Block Nested Loop=Off By default, block_nested_loop is on and batched_key_access is off. Block_nested_loop (default on) controls use of bnl join algorithm. It is possible to control whether hash joins are employed using one of the bnl and. The block_nested_loop and batched_key_access flags of the optimizer_switch system variable control how the optimizer uses. By default, block_nested_loop is on and batched_key_access is off. See section 10.9.2, “switchable optimizations”. By default, mysql employs hash joins whenever possible. Using join buffer (block nested loop) means the join is unable to use an index, and it's doing the join the hard way. The block_nested_loop flag of the optimizer_switch system variable controls hash joins.

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