Re: SQL/DDS Overlap In System Catalog

[CRPence <crp@xxxxxxxxxxxxxxxxxxxx>]

  The SYS* files in QSYS2 are the "SQL Catalog VIEWs".  As such that 
they may limit data to only SQL defined objects when appropriate.
  To see the full details about what is excluded/included, refer to the 
CREATE VIEW statement <SYSVIEWS data or DSPFD>.  Reviewing those 
definitions will show that as SQL catalogs they are including only SQL 
INDEX details.  Also that the data is coming from the underlying System 
Database Cross Reference tables; the QADB* files in QSYS.  Refer to the 
data available from those underlying files if non-SQL database file 
information is of interest.
  Note: The QADB* files are read-only.  The physical files are also 
inaccessible to ordinary users by authority, but each [or most if not 
all] have a logical file with the identical format that does give *READ 
access.  So to either create your own LF or access the PF directly [e.g. 
to create a VIEW], the special authority *ALLOBJ must be adopted.  For 
any user created VIEW or LF, note caveats in CPF32D1.  It is best to 
always access the files with clauses WITH NC FOR READ ONLY

Regards, Chuck
-- All comments provided "as is" with no warranties of any kind 
whatsoever and may not represent positions, strategies, nor views of my 
employer

eftimios pantzopoulos wrote:
> I have become used to using SYSCOLUMNS & SYSTABLES in QSYS2 to analyse 
> aspects of an applications data base because files created via DDS & 
> tables created through DDL both have their meta-data recorded there.
>
> I recently thought I'd use SYSINDEXES & SYSKEYS (for the first time ever 
> for me) to do some other analysis and realized that DDS defined keys are 
> not present in these files. I realize that a LF is a hybrid beast and 
> shows traits of both a view and an index, but it seems a bit extreme to 
> completely exclude DDS generated entities from some of the system 
> catalog files, but not others.
>
> Does anyone have a link to a definitive document which details this grey 
> area of DDS & DDL overlap in the system catalog, or can provide a 
> comment on the above?
>
> Thanks,
> Mike Pantzopoulos