reindex

Reindexing is an option to rebuilt data stored under the index table in the database.

Why do we need implementing this? An index becomes corrupted and no longer contains a valid data. So, reindexing works as a sort of recovery method. It allows replacing the old copy of the index with a new update.

Reindex can be performed with 2 ways. The first one is to use admin panel tools (if your engine allows it, like Magento). There you should navigate to System -> Index Management to perform it.

Feel free to check out the tutorial on how to re-index data and in what cases it is needed.

Alternative way is to update index through the command line. The command to check the current status of all indices is:

php  /your-magento-path/shell/indexer.php -status

To run indexer on any indices, you have to run command like this:

  php  /your-magento-path//shell/indexer.php --reindex catalog_product_price

Or

 php  /your-magento-path//shell/indexer.php --reindex cataloginventory_stock