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cookies.sqlite-shm & cookies.sqlite-wal?

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  • 7 have this problem
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  • Last reply by finitarry

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While Firefox 6 is running, there are two extra cookies files in the profile: cookies.sqlite-shm and cookies.sqlite-wal. These disappear when Firefox closes. What do they do?

While Firefox 6 is running, there are two extra cookies files in the profile: cookies.sqlite-shm and cookies.sqlite-wal. These disappear when Firefox closes. What do they do?

Chosen solution

I did not read the entire article. You can explore some of the documentation at the following if you need a thorough understanding:


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Those files are being created by the new sqlite:


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Not related to your question, but...

You need to update some plug-ins:

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Thanks for the info. I guess I had better check for a newer Flash plugin. The linked page from your reference explained somewhat. What processes are sharing data? The -shm implies that data in memory is being shared between processes.

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The link says:

  • Shm files are Shared Memory files and seem to be used with the above. (the above is "Wal files http://www.sqlite.org/wal.html "Write-Ahead Logging"")


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Modified by SafeBrowser

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So the -shm file is created as a hex dump of the index in memory in case Firefox is aborted abnormally, so that it can pick up where it left off?

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Chosen Solution

I did not read the entire article. You can explore some of the documentation at the following if you need a thorough understanding:


If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.

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Thanks. Interesting pages.