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How many warm MyISAM key blocks do you have?

When you are working with MyISAM [ 1 ] tables MySQL provides a feature called the Midpoint Insertion Strategy [ 2 ]. You can enable it with the parameter key_cache_division_limit [ 3 ].

By default, the key cache management system uses a simple LRU [ 4 ] strategy for choosing key cache blocks to be purged:

MyISAM key buffer

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