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Run this command in your CLI

php bin/magento indexer:reindex

and if you want to reindex only one indexer then write following command:

php bin/magento indexer:reindex indexer_name.

where indexer_name can be found by typing following command :

php bin/magento indexer:info

Use Magento CLI. Run php bin/magento indexer:reindex from project root directory.

Here is how you can get things done using Magento 2 CLI indexing commands

Get into your Magento CLI command file available in Magento/bin directory
cd magento_folder/bin and run your comamnd directly using magento in terminal or putty.

Here is how it will work for indexing in Magento 2

Get list of available indexer in Magento 2

php bin/magento indexer:info

How to check status of indexer

Following command will get you the status of all the indexer whether indexing is required or ready.

php bin/magento indexer:status

You can also check status of individual indexer: let say i want to check status of catalog_category_product

php bin/magento indexer:status catalog_category_product

How to reindex all available indexing in Magento 2

php bin/magento indexer:reindex

In case you fill memory limit, try this command

php bin/magento -dmemory_limit=2G magento indexer:reindex

If any index is looping You can reset all index by using
indexer:reset

then use normal reindex

To Reindex from command prompt run below command:

php bin/magento indexer:reindex

Above command should be run from magento root directory

Alternative solution add php bin/magento indexer:reindex command at cronjob.

I have follow this and it has been working at my system

solved with
php bin/magento indexer:reindex

a. Reindex from Magento admin *sometimes not all indexers are reindexed using admin reindex > check also reindex via SSH

1. Go to System > Index Management and check indexers status


2. Select the items that are marked as "Reindex required" and go to Actions > Update on schedule

This will trigger a reindex for selected indexers.

Important: Sometimes not all indexers are reindexed using admin reindex even if time & date is showing as updated in magento admin. We recommend to double check the reindex process using the SSH/CLI reindex method presented below.

Reindex mode: You can set your indexers as "Update on Save" and store entities will be indexed when saving admin configurations or as "Update by Schedule" and indexers will be reindexed recurrently (default once / day) . In order for "Update by Schedule" to work ok, make sure your cron jobs are running correctly on your server. Your hosting partner or development team can help you with the cron jobs configuration.

Done!

b. Reindex via SSH / CLI (recommended)

1. Connect to your Magento 2 installation in the root of your project. (usually in public_html or under yourmagentoinstallation.com/html)




2. Reindex all Magento 2 indexers using below command:

php bin/magento indexer:reindex

You will receive a similar result as presented below:

Design Config Grid index has been rebuilt successfully in 00:00:00

Customer Grid index has been rebuilt successfully in 00:00:00

Category Products index has been rebuilt successfully in 00:00:00

Product Categories index has been rebuilt successfully in 00:00:00

Product Price index has been rebuilt successfully in 00:00:01

Product EAV index has been rebuilt successfully in 00:00:01

Catalog Search index has been rebuilt successfully in 00:00:01

Stock index has been rebuilt successfully in 00:00:00

Catalog Rule Product index has been rebuilt successfully in 00:00:01

Catalog Product Rule index has been rebuilt successfully in 00:00:00

3. 
   

   Check the status of the indexers and identify indexers that still need to be individually reindexed, sometimes general reindex does not work for all indexers

   
   
   

   php bin/magento indexer:status

   
   

You will receive a similar result as presented below:

Design Config Grid: Ready

Customer Grid: Ready

Category Products: Ready

Product Categories: Ready

Product Price: Ready

Product EAV: Ready

Catalog Search: Ready

Stock: Ready

Catalog Rule Product: Reindex required

Catalog Product Rule: Ready

4. 
   

   Show the list of the indexers and corresponding indexer id that need to be used for individual re-index.

   
   
   

   php bin/magento indexer:info

   
   

You will receive a similar result as presented below:

design_config_grid Design Config Grid

customer_grid Customer Grid

catalog_category_product Category Products

catalog_product_category Product Categories

catalog_product_price Product Price

catalog_product_attribute Product EAV

catalogsearch_fulltext Catalog Search

cataloginventory_stock Stock

catalogrule_rule Catalog Rule Product

catalogrule_product Catalog Product Rule

5. 
   

   Reindex each indexer that has status "Reindex required" using below commands

   
   
   

   php bin/magento indexer:reindex [catalog_category_flat]

   
   

Example: php bin/magento indexer:reindex catalogrule_rule

php bin/magento indexer:reindex design_config_grid customer_grid

php bin/magento indexer:reindex catalog_category_product

php bin/magento indexer:reindex catalog_product_category

php bin/magento indexer:reindex catalog_product_price

php bin/magento indexer:reindex catalog_product_attribute

php bin/magento indexer:reindex catalogsearch_fulltext

php bin/magento indexer:reindex cataloginventory_stock

php bin/magento indexer:reindex catalogrule_rule

php bin/magento indexer:reindex catalogrule_product

6. Check again the status of the indexers using the command from step 2, now all indexers should be "Ready".

Done!