Daniel.hu [email_address]

HASH vs B+ Tree Cluster Index vs No Cluster Index INNODB vs MYISAM

HASH vs B+ Tree

Cluster Index vs No Cluster Index

INNODB vs MYISAM

Insert performance Batch INSERT and REPLACE Use LOAD DATA instead of INSERT Other tricks Forbidden Foreign key Forbidden Index Rebuild Index

Insert performance

Batch INSERT and REPLACE

Use LOAD DATA instead of INSERT

Other tricks

Forbidden Foreign key

Forbidden Index

Rebuild Index

Do you always need index on WHERE column Does the order of columns in an index matter IN vs OR

Do you always need index on WHERE column

Does the order of columns in an index matter

IN vs OR

IN vs OR large IN clauses are problematic

IN vs OR

large IN clauses are problematic

Explain

Explain

Make sure you strike a good balance for indexing Too many adversely affects data input Too few adversely affects reads Order of columns in an index matters! Covering indexes are the fastest query possible

Make sure you strike a good balance for indexing

Too many adversely affects data input

Too few adversely affects reads

Order of columns in an index matters!

Covering indexes are the fastest query possible

Consider the impact of duplicate rows Avoid SELECT DISTINCT if it doesn’t cause a problem Use UNION ALL instead of UNION if duplicate rows are acceptable Use foreign key as index or create independent index Despite what you see in examples, avoid SELECT *

Consider the impact of duplicate rows

Avoid SELECT DISTINCT if it doesn’t cause a problem

Use UNION ALL instead of UNION if duplicate rows are acceptable

Use foreign key as index or create independent index

Despite what you see in examples, avoid SELECT *

Operators in the WHERE clause make a big difference Avoid <> and LIKE Use EXISTS, NOT EXISTS, and LEFT JOINS instead of NOT IN If you must use LIKE, make the first character a literal

Operators in the WHERE clause make a big difference

Avoid <> and LIKE

Use EXISTS, NOT EXISTS, and LEFT JOINS instead of NOT IN

If you must use LIKE, make the first character a literal

Don’t use ORDER BY unless you really need it Don’t use Count(…) where to protect data integeration Don't use ORDER BY RAND() when data is huge

Don’t use ORDER BY unless you really need it

Don’t use Count(…) where to protect data integeration

Don't use ORDER BY RAND() when data is huge

http://dev.mysql.com/doc/refman/5.1/zh/optimization.html#insert-speed http://www.xaprb.com/blog/2006/07/04/how-to-exploit-mysql-index-optimizations/ http://www.informit.com/articles/article.aspx?p=377652

http://dev.mysql.com/doc/refman/5.1/zh/optimization.html#insert-speed

http://www.xaprb.com/blog/2006/07/04/how-to-exploit-mysql-index-optimizations/

http://www.informit.com/articles/article.aspx?p=377652

Thank you!

Thank you!