-- MariaDB supports `IF NOT EXISTS` syntax when creating indexes. -- If an index already exists with the same name, it will not be duplicated. -- However, you should still review your pre-existing indexes in advance -- to make sure you do not already have one or more of the same indexes -- defined under a different name. If so, you should omit them -- from what you apply to your MariaDB database. ALTER ONLINE TABLE blc_order ADD INDEX IF NOT EXISTS IDXalyswc028fb7oasa99jsk9fvc (account_id) ALTER ONLINE TABLE blc_order ADD INDEX IF NOT EXISTS IDXdwnptndx2usrj6jlvg2bejqe4 (root_account_id)