Thursday, February 18, 2016

Temporary Database

In an earlier blog, I mentioned about writing an article on how to use a temporary database for manipulating data that does not cause the front end to increase in file size. Unfortunately, I got side-tracked and forgot about it until recently when someone reminded me about what I said and requested that I write the article now. I apologize for the long delay and hope that this article and the attached demo will help clarify what I meant back then.

To recap, it is sometimes unavoidable to use temporary tables as a working space to manipulate the data before it can be consumed to represent its final form. However, doing so results in the size of the database file to increase almost exponentially each time this happens. It then becomes necessary to perform a compact and repair at a regular interval to keep the file size to a minimum and prevent reaching the 2GB limit.

As an alternative, the working data can be moved to a separate and temporary database file, so the size of the front end file will not be affected. That is what this demo file will try to illustrate. Please click on the image below to download the file.

How it works.

The demo contains a table with the data that is required to be manipulated. Instead of creating a temporary table, the demo creates a temporary database in the same folder as the front end file. It then copies the data from the local table into the temporary database. A linked table is then created to establish a connection between the front end and the temporary database. As the linked table is created, a security warning may display. This can be avoided by creating the temporary database in a Trusted Location. When the user closes the database, the temporary database file can be manually deleted. The demo automatically deletes the temporary database file prior to creating a new one.

Please let me know if you have any questions. Thank you.

Original post date: July 31, 2015

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