![]() Correct use of indexes substantially increases query performance. It's important to ensure that your data set contains appropriate indexes. Higher values can accelerate the sorting of large result sets, but risk increasing memory usage on a highly active server. sort_buffer_size : Like join_buffer_size , but applicable to sorting operations using filesort. ![]() Complex joins between multiple tables will need multiple buffers, each of join_buffer_size capacity, which can quickly consume a lot of RAM. Setting it too high can lead to memory issues, as a join buffer is allocated for each full join between tables. Increasing the size of this buffer will accelerate queries, which use unindexed joins.
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