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HomeHomeDevelopment and...Development and...SQL and SQL Ser...SQL and SQL Ser...DNN not working with read-only databaseDNN not working with read-only database
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3/20/2015 4:08 AM

Recently I've tried to optimize my DNN backup script to ensure 100% website availability by allowing IIS to work during DB and filesystem backup process. The problem is: if I set DB to read-only mode, DNN fire HTTP 500 error and complaining about it could not update DB as it read-only.

New Post
3/20/2015 4:49 AM


even if it seems that no one enters data: DNN logs a lot of things into the database (as page visits, errors, user logins, etc. etc.) - so setting the db to read only results in exactly those errors.

During the DB backup, there is no reason to stop IIS. The backup always happens in a consistent state, at a specific point of time. The only "problem" could be when you backup the files, as some cache and/or log files could be locked by the application pool. This is not really a problem when restoring the files in regard of a working web site.

Of course: If you want  to ensure that the files and the database are consistent (because of tables referencing files for example) then you should stop the application pool, make a backup of the database and the files and starting the app pool again.

Happy DNNing!

Michael Tobisch
DNN★MVP - The most vibrant community around the DNN-platform
New Post
3/20/2015 4:51 AM
use Backup options of SQL Server instead of backing up database files yourself.

Cheers from Germany,
Sebastian Leupold

dnnWerk - The DotNetNuke Experts   German Spoken DotNetNuke User Group

Speed up your DNN Websites with TurboDNN
New Post
3/20/2015 5:55 AM

I do DB backup via osql utility, then goes filesystem backup via archiver.



New Post
3/20/2015 6:29 AM

If app. pool isn't stopped, and user (or come other agent) makes website filesystem changes after DB backup and initial files listing done by archiver utility,  then 3 (well, at least) cases may happen:

1) If user adds new files in that time, archiver just not lists them, and DB backup (done before) just not contains references to them. In case of full restore needed, those newly added files will be lost - but it's OK, as some part of work will be lost anyway.

2) If user changes files content in that time, achiver will add changed files to backup, and DB already contains references to them (maybe with some desync about file size, etc.) So it also OK.

3) But if user deletes some files in that time, archiver already listed them (but they will not be added to filesystem backup, as there are no such files), but DB backup will still contain references to deleted files.

Point 3 is the main concern - how those references to non-existant files will be treated by DNN?

HomeHomeDevelopment and...Development and...SQL and SQL Ser...SQL and SQL Ser...DNN not working with read-only databaseDNN not working with read-only database

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