Magento 2 – Fix for Indexing Errors After Upgrade

After upgrading Magento 2 to a newer version, many developers and store owners encounter indexing errors. These errors usually appear in the Admin Panel or when running CLI commands, and they can prevent catalog, price, or stock data from being updated correctly.

Common Error Messages

One or more indexers are invalid. Make sure your Magento cron job is running.

SQLSTATE[42S02]: Base table or view not found

Indexer process cannot be initialized.

Root Causes

• Database schema changes after upgrade not applied correctly.
• Missing or outdated indexer tables.
• Cron jobs not running, leaving indexers invalid.
• Custom modules conflicting with new Magento version.

Step-by-Step Fix

1. Run Upgrade Command:

   
       php bin/magento setup:upgrade
       

2. Recompile Code:

   
       php bin/magento setup:di:compile
       

3. Reindex All:

   
       php bin/magento indexer:reindex
       

4. Check Indexer Status:

   
       php bin/magento indexer:status
       

5. Verify Cron Jobs:

   
       * * * * * php /path/to/magento/bin/magento cron:run | grep -v "Ran jobs by schedule" >> /path/to/magento/var/log/magento.cron.log
       

SQL Query Solution

If error in indexing after upgrade then run below SQL query in phpMyAdmin:

CREATE SQL SECURITY INVOKER VIEW `inventory_stock_1` AS 
SELECT DISTINCT 
    legacy_stock_status.product_id,
    legacy_stock_status.website_id,
    legacy_stock_status.stock_id,
    legacy_stock_status.qty quantity,
    legacy_stock_status.stock_status is_salable,
    product.sku
FROM `cataloginventory_stock_status` legacy_stock_status
INNER JOIN `catalog_product_entity` product 
    ON legacy_stock_status.product_id = product.entity_id;

After running the query, execute the following commands:

• Reindex All:

  
      php bin/magento indexer:reindex
      

Practical Example

Suppose you upgraded from Magento 2.3.x to 2.4.x and see “One or more indexers are invalid.” Running the SQL query above recreates the missing inventory_stock_1 view, which resolves the indexing error. After clearing cache and recompiling, the indexers should show as Ready.

Best Practices

• Always run setup:upgrade after upgrading Magento.
• Reindex immediately after upgrade to refresh data tables.
• Keep cron jobs active to avoid invalid indexers.
• Document custom SQL fixes for future upgrades.

SEO & UX Benefits

• Ensures product data is always fresh and accurate.
• Improves customer experience with correct prices and stock levels.
• Boosts SEO by keeping catalog data consistent.

Troubleshooting

• If errors persist, check var/log/system.log and var/log/exception.log.
• Verify database tables exist for all indexers.
• Disable custom modules temporarily to isolate conflicts.
• Run php bin/magento setup:db:status to confirm schema is up to date.

Conclusion

Indexing errors after upgrading Magento 2 are common but easily fixable. By running upgrade commands, applying the SQL query fix, and ensuring cron jobs are active, you can resolve these issues quickly. Keeping your store properly indexed ensures smooth performance, accurate product data, and a better shopping experience for customers.