What are the ways to improve the performance of MySQL

This article mainly introduces "what are the ways to improve the performance of MySQL". In daily operation, I believe many people have doubts about the methods to improve the performance of MySQL. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful for you to answer the questions of "what are the methods to improve the performance of MySQL?" Next, please follow the editor to study!

Several simple methods to improve the performance of MySQL are mainly used for reference in the design and development stage. [@ more@] 1, Carefully choose attribute types and lengths.

Choose the type and length of the field carefully.

2 、 Use fixed-length attributes: try to avoid the types VARCHAR, BLOB, and TEXT.

Use fixed-length fields and try to avoid using VARCHAR, BLOB, and TEXT.

3. MySQL can't join tables using an index if the attributes are different types or (in some cases) have different lengths.

If the type or length of the table is inconsistent, MySQL will not be able to use the index when the table is joined.

4. Create a statistics table if aggregate functions such as COUNT () or SUM () are frequently used in queries that contain WHERE clauses and are on large tables.

For queries and large tables that contain where clauses, if you often need to use statistical functions (such as count, sum), it is best to create corresponding statistical tables.

5. If you're inserting large numbers of rows, list the values in one (or few) insert statements as this is much faster to process.

When inserting a large number of records, listing the values of a row in only one (or a few) insert statements is much faster. (one statement, multiple lines, separated by commas)

6 、 If large numbers of rows are deleted from a table, or a table containing variable-length attributes is frequently modified, disk space may be wasted.

If a table deletes a large number of records, or a table that contains variable-length fields is frequently modified, disk space will be wasted. The data is not actually deleted or modified, just its location is no longer used. Wasted disk space will affect access speed. It is generally necessary to reorganize the table periodically and optimize the OPTIMIZE TABLE.

7 、 MySQL uses statistics about a table to make decisions about how to optimize each query. You can update these statistics by running:

ANALYZE TABLE customer

MySQL uses statistics from a table to determine how to optimize each query. Command to update table statistics: ANALYZE TABLE...

8. Use the Heap table type discussed in "Table Types" for small tables that are searched only for exact matches using = or.

Use tables of type HEAP.

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