Simple information to learn Cache in Drupal

Cache is used to save the data fetched from DB and store it in a table.  Display the stored information using the Cache ID i.e. cid.

cid is primary key in "cache" table.  Few more cache tables available in drupal for other purposes like.. caching the blocks, caching the filters, caching the forms, caching the menus etc..

So, for every single purpose drupal use a separate table.  Tables like..

• cache_block
• cache_filter
• cache_form
• cache_menu
• cache_page
• cache_update