A cache stores data that is expensive to fetch or compute to improve performance. Drupal uses caching extensively to store node data, blocks, pages and other content to avoid unnecessary database queries or PHP processing. Caches in Drupal can be stored and retrieved using functions like cache_get() and cache_set() and come in forms like block, content, page and update caches.

1. Cache a Drupalban

2. A cache (pronounced /kæʃ/ ) is a collection of data duplicating original values Stored elsewhere or computed earlier, where the original data is expensive to fetch (owing to longer access time) or to compute, compared to the cost of reading the cache. Wikipedia

7. Eaccelerator

8. XCache

9. IonCube

10. Turck MMCache

11. Nusphere PhpExpress

12. Zend Optimizer+

13. Zend Platform

14. function node_load( $param = array() , $revision = NULL , $reset = NULL ) { static $nodes = array() ; if ( $reset ) { $nodes = array() ; } … if ( isset ( $nodes [ $param ])) { return is_object( $nodes [ $param ]) ? drupal_clone( $nodes [ $param ]) : $nodes [ $param ]; } … return $node ; }

15. cache_get( $cid , $table = 'cache' ) cache_set( $cid , $data , $table = 'cache' , $expire = CACHE_PERMANENT, $headers = NULL )

17. cache_block

18. cache_content

19. cache_filter

20. cache_form

21. cache_menu

22. cache_page

23. cache_update

24. +------------+--------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +------------+--------------+------+-----+---------+-------+ | cid | varchar(255) | NO | PRI | | | | data | longblob | YES | | NULL | | | expire | int(11) | NO | MUL | 0 | | | created | int(11) | NO | | 0 | | | headers | text | YES | | NULL | | | serialized | smallint(6) | NO | | 0 | | +------------+--------------+------+-----+---------+-------+

25. function mymodule_schema() { $schema = array() ; $schema [ 'cache_mymodule' ] = drupal_get_schema_unprocessed( 'system' , 'cache' ); $schema [ 'cache_mymodule' ][ 'description' ] = '' ; return $schema ; }

27. Database

28. eAccelerator

29. File

30. Memcache

31. Memcached (Alpha)

32. XCache

33. Memcache