I am trying to save product attributes in my Magento2 system and there may be 100 thousands of attributes.

However, I see that the value specified as auto increment in the eav_attribute table is defined as smallint.

In this case, I get an error when I reach the value 65535 while saving these product attributes.

How can I solve this problem?

1 Answer 1


To change the data type for an existing column. You can create a new module and redefine the data type for it in db_schema.xml file.
In your case, we'll change the data type for the attribute_id column in the eav_attribute table from small_int (has a maximum value signed is 32767) to int (has a maximum value signed is 2147483647).

Assume the Vendor name is TuVan and the module name is ChangeEAVAtrributeTableColumnType, take the following steps:

Step 1: Create app/code/TuVan/ChangeEAVAtrributeTableColumnType/registration.php


use Magento\Framework\Component\ComponentRegistrar;

ComponentRegistrar::register(ComponentRegistrar::MODULE, 'TuVan_ChangeEAVAtrributeTableColumnType', __DIR__);

Step 2: Create app/code/TuVan/ChangeEAVAtrributeTableColumnType/etc/module.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
    <module name="TuVan_ChangeEAVAtrributeTableColumnType">
            <module name="Magento_Eav"/>

Step 3: Create app/code/TuVan/ChangeEAVAtrributeTableColumnType/etc/db_schema.xml

<?xml version="1.0"?>
<schema xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    <table name="eav_attribute">
        <column xsi:type="int" name="attribute_id" unsigned="true" nullable="false" identity="true"
                comment="Attribute ID"/>

Step 4: Run the setup upgrade command to install and enable the module:

bin/magento setup:upgrade

Step 5: Run compilation code command:
bin/magento setup:di:compile

Step 6: Run deploy static content command:
bin/magento setup:static-content:deploy -f

You're done!

Since other tables also refer to the eav_attribute column, you'll need to find them and make the change for them as well.

You can run the following SQL query to get all references for a database column.

  • Thanks for your reply. Will this change work automatically for related tables that use the attribute_id field as a foreign key?
    – Zalmoxis
    Jun 5 at 7:21
  • I'm a little confused about what you're trying to say. Could you please provide more information or context?
    – Tu Van
    Jun 5 at 8:05
  • For example some tables has foreign key eav_attribute.attribute_id. And these field type should be same. Will they all be updated when I make this change?
    – Zalmoxis
    Jun 5 at 8:15
  • magento.eav_entity_attribute.EAV_ENTITY_ATTRIBUTE_ATTRIBUTE_ID_EAV_ATTRIBUTE_ATTRIBUTE_ID like this.
    – Zalmoxis
    Jun 5 at 8:41
  • I understand your point, the answer is no, this change only applies to the eav_attribute table. Therefore, you should find all related tables that are referred to the eav_attribute column and make the change for them as well. I've updated my answer to add the SQL query to get all references for a database column.
    – Tu Van
    Jun 5 at 9:12

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