The indexes on a the tables of a large database make a huge difference in its performance and utility. Without an index, locating a single record in a large table can take several seconds; with the ...
The MEMORY storage engine stores all data in memory (RAM), and is used for fast lookup of data. InnoDB supports a buffer pool ...
Creates indexes on columns in tables. Restriction: You cannot use CREATE INDEX on a table accessed via an engine that does not support UPDATE processing. an IN subquery where the column in the inner ...
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