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After resuming normal operation of your web site, check the /tmp directory to verify that the qt_temp.xxxxx files have stopped proliferating.  You may delete the old renamed statistics data base file whenever you like.

For versions Zend Server 9.1.x, 2018.0.x, 2019.0.

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Please open Navigator and navigate to /usr/local/zendphp7/var/db

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