magento/magento2 #8616:

Unused mysql privileges required even if not used/not needed at all
- removed REFERENCES and EVENT privileges from DbValidator (also in Test Unit).

Author: Nino Aratari

setup/src/Magento/Setup/Test/Unit/Validator/DbValidatorTest.php

@@ -55,7 +55,6 @@ public function testCheckDatabaseConnection()
             ['DELETE'],
             ['CREATE'],
             ['DROP'],
-            ['REFERENCES'],
             ['INDEX'],
             ['ALTER'],
             ['CREATE TEMPORARY TABLES'],
@@ -65,7 +64,6 @@ public function testCheckDatabaseConnection()
             ['SHOW VIEW'],
             ['CREATE ROUTINE'],
             ['ALTER ROUTINE'],
-            ['EVENT'],
             ['TRIGGER'],
         ];
         $accessibleDbs = ['some_db', 'name', 'another_db'];

setup/src/Magento/Setup/Validator/DbValidator.php

@@ -146,7 +146,6 @@ private function checkDatabasePrivileges(\Magento\Framework\DB\Adapter\AdapterIn
             'DELETE',
             'CREATE',
             'DROP',
-            'REFERENCES',
             'INDEX',
             'ALTER',
             'CREATE TEMPORARY TABLES',
@@ -156,7 +155,6 @@ private function checkDatabasePrivileges(\Magento\Framework\DB\Adapter\AdapterIn
             'SHOW VIEW',
             'CREATE ROUTINE',
             'ALTER ROUTINE',
-            'EVENT',
             'TRIGGER'
         ];