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IDS Forum

Re: Corrupt system catalog

Posted By: Art Kagel
Date: Friday, 15 March 2013, at 2:24 p.m.

In Response To: RE: Corrupt system catalog (Andrew Ford)

While at Bloomberg, we used to have to rebuild an index or two ever time
the servers were bounced or crashed. We lost 6 indexes (2 each) on the
three largest tables in our news database on all three news servers one
weekend. I worked all day that Sunday until 5AM on Monday to get on server
back online in time for the markets in the morning and left to get some
sleep with the last indexes building (one on a second server and two on
the last one). Was awakened at 9AM by a screaming development director
asking "Why the F&%$ are you home when I have only one news server online?
Get your F&%$ing A$$ in here and fix it!" I sleepily explained the
situation slammed the phone down and got dressed. Arrived to an abashed
uber boss apologizing for not knowing that I'd been in the office for
almost 28 hours before going home and by-the-way I was right the second
news server had come back online before I got back into the office. Two
weeks later they finally let me turn logging on for all of our databases on
45 server instances and I only lost one other index in the following ten
years even though data volumes, transaction rates, and numbers of ultimate
users had more than doubled in that time.

Art

Art S. Kagel
Advanced DataTools (www.advancedatatools.com)
Blog: http://informix-myview.blogspot.com/

Disclaimer: Please keep in mind that my own opinions are my own opinions
and do not reflect on my employer, Advanced DataTools, the IIUG, nor any
other organization with which I am associated either explicitly,
implicitly, or by inference. Neither do those opinions reflect those of
other individuals affiliated with any entity with which I am affiliated nor
those of the entities themselves.

On Fri, Mar 15, 2013 at 12:34 PM, Andrew Ford <andrew@informix-dba.com>wrote:

> Thanks everyone for the input.
>
> Something fishy is going on. They had 3 corrupt indexes in one database and
> at least one corrupt sysdistrib index in another all showing up at about
> the
> same time and very quickly, this instance has been up for no more than a
> week.
>
> The instance is running on a virtual machine that I have no control over,
> I'm thinking something happened at the disk level (cooked chunks) while the
> engine was online.
>
> I haven't dealt with unlogged databases in a long time. I have experienced
> some index corruption using them, but not as much as this and not as
> quickly
> as this.
>
> I'm going to try the delete from sysdistrib trick to see if that will allow
> me to drop the database with corruption. I doubt we will call in IBM
> support
> on this Innovator-C instance. I can unload the data/reinit the
> instance/recreate the dbs/reload the data in the time it would take to get
> the paper work together.
>
> Andrew
>
> -----Original Message-----
> From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of Art
> Kagel
> Sent: Friday, March 15, 2013 10:16 AM
> To: ids@iiug.org
> Subject: Re: Corrupt system catalog [29761]
>
> OK, that fits with my experience. Only unlogged databases experience index
> corruption except in extreme circumstances.
>
> One thing you could try is to delete all the rows in the sysdistrib table
> and see if that lets the server 'repair' the index structure.
>
> So, if you can unload the data, the only option may be to reload it into a
> clean new database. If there aren' t too many other databases I'd scrap the
> instance and start over. Alternatively if you have support on this server,
> IBM may be able to make the database "go away".
> Art S. Kagel
> Advanced DataTools (www.advancedatatools.com)
> Blog: http://informix-myview.blogspot.com/
>
> Disclaimer: Please keep in mind that my own opinions are my own opinions
> and
> do not reflect on my employer, Advanced DataTools, the IIUG, nor any other
> organization with which I am associated either explicitly, implicitly, or
> by
> inference. Neither do those opinions reflect those of other individuals
> affiliated with any entity with which I am affiliated nor those of the
> entities themselves.
>
> On Fri, Mar 15, 2013 at 10:43 AM, Andrew Ford
> <andrew@informix-dba.com>wrote:
>
> > I'm not given that option by oncheck, it just say lets me know there
> > is corruption but doesn't ask me if I'd like to fix it.
> >
> > This is NOT a logged database.
> >
> > Andrew
> >
> > -----Original Message-----
> > From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of
> > Art Kagel
> > Sent: Thursday, March 14, 2013 10:46 PM
> > To: ids@iiug.org
> > Subject: Re: Corrupt system catalog [29754]
> >
> > Have you tried to let oncheck repair/rebuild the damaged index? Just
> > for curiosity sake, is this a logged database?
> >
> > Art
> >
> > Art S. Kagel
> > Advanced DataTools (www.advancedatatools.com)
> > Blog: http://informix-myview.blogspot.com/
> >
> > Disclaimer: Please keep in mind that my own opinions are my own
> > opinions and do not reflect on my employer, Advanced DataTools, the
> > IIUG, nor any other organization with which I am associated either
> > explicitly, implicitly, or by inference. Neither do those opinions
> > reflect those of other individuals affiliated with any entity with
> > which I am affiliated nor those of the entities themselves.
> >
> > On Thu, Mar 14, 2013 at 10:46 PM, Andrew Ford
> > <andrew@informix-dba.com>wrote:
> >
> > > 11.70.UC7IE running on Ubuntu
> > >
> > > I've got a corrupt sysdistrib table somehow
> > >
> > > $ oncheck -cDI breaker_pnl_old:sysdistrib
> > >
> > > Validating indexes for breaker_pnl_old:informix.sysdistrib...
> > >
> > > Index distrib
> > >
> > > Could not bfget pagenum 0x5be, iserrno 105
> > >
> > > ISAM error: illegal key descriptor (too many parts or too long).
> > >
> > > ERROR: Index distrib for breaker_pnl_old:informix.sysdistrib is bad.
> > >
> > > I am able to successfully unload/reload the database into a new copy
> > > of the db, but any attempt to drop the old database with the corrupt
> > > sysdistrib table is met with
> > >
> > > 211: Cannot read system catalog (sysdistrib).
> > >
> > > 105: ISAM error: bad isam file format.
> > >
> > > and any attempt to drop the distrib index runs into
> > >
> > > 511: Cannot modify system catalog (sysdistrib).
> > >
> > > Short of unloading all data and an oninit -i is there anything I can
> > > do to drop the db with the corrupt system catalog table?
> > >
> > > Thanks,
> > >
> > > Andrew
> > >
> > >
> > >
> > >
> >
> > **********************************************************************
> > ******
> > ***
> > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > >
> > >
> >
> > --e89a8f2346598d9c5404d7ee7b8d
> >
> >
> > **********************************************************************
> > ******
> > ***
> > Forum Note: Use "Reply" to post a response in the discussion forum.
> >
> >
> >
> >
>
> ****************************************************************************
> ***
> > Forum Note: Use "Reply" to post a response in the discussion forum.
> >
> >
>
> --bcaec54b48d01379e704d7f81c7b
>
>
> ****************************************************************************
> ***
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--bcaec554dbc86e7ffe04d7fabf98

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