dblook scripts cannot be relied on to recreate the permissions and schema
objects of a database
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Key: DERBY-3954
URL: https://issues.apache.org/jira/browse/DERBY-3954
Project: Derby
Issue Type: Bug
Affects Versions: 10.4.2.0, 10.5.0.0
Reporter: Rick Hillegas
The Tools Guide is unclear about what you can expect dblook to do for you. The
top level section on dblook makes the modest claim that you can use dblook to
view the schema of a database--no claim is made that the view is consistent or
usable. However, the later section "Generating the DDL for a database" suggests
that you can recreate your database using the script produced by dblook. It
would not be unreasonable for a user to try to do this.
However, the following problems mean that you can't rely on the script produced
by dblook:
1) No attempt is made to sort objects according to their dependencies. For
instance, foreign key tables might be declared before the primary key tables
which they reference.
2) No attempt is made to interleave object creation with privilege and role
grants and there is no support for setting the session to the correct user id
and role needed to make the DDL succeed and register the correct dependencies.
3) Bugs related to function resolution (see DERBY-3944, DERBY-3955, and
DERBY-3953) mean that TABLE and VIEW DDL may fail.
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