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Ensuring that all files
exist
Checking ownership
and permissions
Validating your database
Before restoring, review the table of contents of the backup to ensure that all
files required for IQ are present. The list of files depends on your application.
See the discussion of required and optional files in "Backing up the right files"
on page 392.
Ensure that ownership and permission levels do not change during the system-
level restore.
Backing up a database is useful only if the database is internally consistent.
Backup always makes sure that a database is in a usable state before it
proceeds. However, it's a good idea to validate any database before you back it
up, to ensure that any database you restore is stable. The restore program does
not check for corruption in the data it is restoring, since the database may not
even exist.
To validate your database, issue the following command:
sp_iqcheckdb
You should run
sp_iqcheckdb
problem with the database. The sections that follow provide basic information
on using
. For full details see the Adaptive Server IQ
sp_iqcheckdb
Troubleshooting and Error Messages Guide.
This stored procedure works in conjunction with the set option
DBCC_OPTION. This option should be set to its default value, 0, when you
run
for a routine validation before backup.
sp_iqcheckdb
reads every database page from disk into memory and does
sp_iqcheckdb
various consistency checks. For this reason, running this procedure on a large
database can take a long time. Reading the data consumes most of the
execution time, so you can estimate how long it will take to run the procedure
by the size of your database:
For this size database
10GB
100GB
CHAPTER 11
Backup and Data Recovery
periodically, and whenever you suspect a
It takes about this long
30 minutes
400 minutes (6 1/2 hours)
393
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