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Questions related to Magento's MySQL database, for example, the table schema, plain SQL queries or database configuration. For questions about the Magento database access layer, use other tags, like: eav, model, resource-model, collections, install-script. For questions about SQL queries in particular, the SQL tag is appropriate too.

2 votes
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AWS Read Replica fails to sync magento MEMORY-engine table

After some research it seems that converting those tables using engine "MEMORY" to engine "InnoDB" might work. Although this is not supported, and there seems to be no "official answer", all known fac …
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2 votes
Accepted

How to find out If Magento MySQL is hosted on AWS RDS

First, you could check the database connection string in your app/etc/local.xml file. You might find it in the xml structure inside config > global > resources > default_setup > connection > host. …
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2 votes
2 answers
843 views

AWS Read Replica fails to sync magento MEMORY-engine table

Our Magento 1.9 database is hosted on AWS RDS. For improving database performance, we created an Amazon Read Replica. Unfortunately, the read replica runs out of sync. …
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1 vote
1 answer
1k views

How to add a foreign key with onUpdate Cascade in an M2 installer script?

I want to add a table with a foreign key in an installer script. The foreign key should have ONDELETE CASCADE and ONUPDATE CASCADE set, - but the ->addForeignKey method supports only the ONDELETE o …
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1 vote
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How to add a foreign key with onUpdate Cascade in an M2 installer script?

The ONUPDATE CASCADE is executed, when the row id of a record is changed. This should not happen in Magento at all, as the ids are unique and persistent over their lifetime. Actions like the change of …
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