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IDS Forum

Re: Someone have a technique to alter tables with

Posted By: Art Kagel
Date: Wednesday, 2 May 2012, at 11:02 a.m.

Prior to 11.50 you could only handle this in your code by adding a test in
your applications after the execution of a prepared statement or the
opening of a cursor against a prepared statement so that if the operation
returns SQLCODE == -710 then reprepare the statement and reexecute the
statement or redeclare and reopen the cursor and all would be well. There
is now another way:

You can try setting the ONCONFIG parameter or the environment variable
AUTO_REPREPARE to '1' which tells the engine to automatically reprepare any
prepared statement or recompile any stored procedure that encounters a -710
error

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 Wed, May 2, 2012 at 9:37 AM, Cesar Inacio Martins <
cesar_inacio_martins@yahoo.com.br> wrote:

> Hi,
>
> 11.50 FC9X6 , AIX 6.1
>
> We suffer with one situation at our production where just not found a
> acceptable way to work yet...
> I already open a PMR (for me this is a defect) but for IBM support is just
> "work as design" .... so, no solution...
> Just a correction / better documentation was made.
>
>
> THE PROBLEM
> - When I alter one table (any changes cited bellow), no matter if I get
> the exclusive lock for this table and all others what exists any FK from/to
> it... new users sessions, when try update/insert/delete any for this
> references tables get the error -710 Table <table-name> has been
> dropped, altered, or renamed.
> - create/drop index online/offline OR add/drop trigger OR add/modify/drop
> column OR alter any constraint...
>
>
> TODAY, THE UNIQUE SOLUTION WHEN THIS OCCUR:
> - Stop all our production, kill all users (put the instance in quiescent)
> and back online immediately .
>
>
>
> HOW I PROCEED WHEN NEED TO CHANGE SOME TABLE:
> - set IFX_DIRTY_WAIT
> - open dbaccess , start new transaction (begin work)
> - lock table in exclusive mode
> - grant a dummy select over the table (lock sys*)
> - At other session, kill all users what is accessing this table
> (identifying with onstat -g opn + onmode -z)
> - execute the alter over the table
> - commit
> If the table have any FK from/to it , I lock and kill users for this
> tables too.
> But, at 90% of the situations , after all executed successfully , the
> system stuck with -710 error.
> Do not matter if the user close all application and open a new session,
> the error -710 persist.
>
>
> THE ENVIRONMENT
> - IFX 11.50 FC9X6 , AIX 6.1 , 4GL 7.32
> - Is a centralized 24x7 system what control all plants of the company .
> - Avg of 1800 sessions concurrent at high peak time and 400 sessions at
> lower peak time.
> - User sessions: 70% incoming from 4GL system (most important and where
> suffer with the problem)
> - User sessions: 25% incoming from Web/Java system
> - User sessions: 5% others....
> - Database have AUTO_REPREPARE and STMT_CACHE active
> - The isolation used is 99% 'dirty read' .
> - The 4GL system work mostly with prepared SQLs where they prepare at
> beginner of 4GL connection then keep this prepare active during they
> execution.
>
>
>
> CONSIDERATIONS
> - If check with onstat -g dic , always have a refcnt and dirty over the
> tables involved. This before , during and after the alter . Even during the
> alter, consider the table in exclusive lock + lock over sys* (grant select).
> - After the alter, appear new references on onstat -g dic. (with dirty
> and without dirty)
> - After finish all alters, if the user got erro -710, close all system ,
> open it again e try again, they stuck at -710 again and again and again and
> again....
> - I try simulate the problem, but with few users, this behave do not occur.
> - Bellow is a stack trace (trapped with onmode -I 710) when the user tryed
> insert a register over a table where is relationed with the table altered
> (in this case, added a new index online over columns what not involve the
> FK)
>
> 0x00000001000b76a8 (oninit)afstack
> 0x00000001000b97bc (oninit)afhandler
> 0x0000000100130b90 (oninit)check_traperror
> 0x00000001001faa94 (oninit)sqerr
> 0x00000001001fa550 (oninit)sqerr1
> 0x00000001001f9e54 (oninit)sqnameerr
> 0x000000010066e4dc (oninit)chkmajvers
> 0x000000010066eb24 (oninit)openrel
> 0x00000001006523b4 (oninit)chkparent
> 0x000000010065b2d0 (oninit)chkrowcons
> 0x0000000100782790 (oninit)addone
> 0x0000000100784e10 (oninit)insone_next
> 0x0000000100769994 (oninit)doinsert
> 0x000000010041cff8 (oninit)aud_doinsert
> 0x00000001004259f8 (oninit)excommand
> 0x000000010044b3bc (oninit)sq_execute
> 0x000000010022463c (oninit)sqmain
> 0x000000010037c160 (oninit)listen_verify
> 0x000000010037a608 (oninit)spawn_thread
> 0x0000000100dd528c (oninit)startup
>
>
>
> At my point of view, Informix isn't able to work 100% online if you need
> to change your scheme (add a simple index using online mode) when you use
> referential integrity.
> I believed this is because our method of work (prepare at start of
> application, and keep this prepared active to reuse it), anyway, should we
> suffer with this consequences!???
>
> Is there some technique to alter a table what I miss here ?
>
> Cesar
>
>
>
>
>
>
> _______________________________________________
> Informix-list mailing list
> Informix-list@iiug.org
> http://www.iiug.org/mailman/listinfo/informix-list
>
>

--14dae9340661131aec04bf0ef83a

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