caching - Cache management and Index management in magento -

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why sometime necessary cache management disable , index management re-index in magento.i new in magento if know reply kindly.

in development environment advised disable cache because tend make changes in template / layout files reflected on frontend / website advised disable cache in development environment. don't in production.

and coming index management, set "save on update" mode each time if make changes products, categories or attributes getting re-indexed automatically , avoids necessity re-index every time manually.


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