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An example of such changes is reported for MySQL and PostgreSQL (this file is also included in resources of core-upgrader
module of the project): the set of SQL statements you need to run vary depending on the DBMS used for internal storage. During manual SQL upgrade you may see some exceptions (given by DBMS) about deletion of not-existing indexes or views, these aren't blocking exceptions; you only need to be sure to delete all indexes and views, in some cases you may need to change a little bit given SQL samples.
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