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IDS Forum

Re: Problem with ONBAR: unusually slow on IDS ....

Posted By: Fernando Nunes
Date: Thursday, 24 February 2011, at 9:48 a.m.

In Response To: Re: Problem with ONBAR: unusually slow on IDS .... (Khaled Bentebal)

As far as I can tell it looks the same defect.... But to be honest the
information is a bit confusing for me (I'm not a usual client of the
internal tools).
Technical support will be able to provide a clear explanation. Please
mention the two APARs.
There are some references that lead me to think that this was resolved in
several internal bug references (one for specific spaces - blobs -, other
related to DBSPACE ordering etc.)
But in any case, it all looks fixed in FC8W2 or maybe in FC8, so you may
need to consider an upgrade.
Note that between FC5 and FC8 there will be conversion.... Meaning that if
you want to go back it's not simply a matter of shutting down FC8* and
starting FC5.
This is nothing too special, but as usual, test, test, test.... :)

On Thu, Feb 24, 2011 at 1:50 AM, Khaled Bentebal <
khaled.bentebal@consult-ix.fr> wrote:

> Thanks Fernando,
>
> What about APAR IC67929 ? This has been also mentionned by support as a
> possibility.
>
> A PMR has been opened.
>
> Khaled Bentebal
>
> Email: khaled.bentebal@consult-ix.fr
>
> Le 24/02/11 00:13, Fernando Nunes a écrit :
> > Hello,
> >
> > It looks like APAR IC71702
> >
> > https://www-304.ibm.com/support/entdocview.wss?uid=swg1IC71702
> >
> > It's fixed in 11.50.FC8W2
> > You may want to open a PMR for further details.
> >
> > Check that the "slow" instance has much more partitions (either table,
> > indexes or fragments) than the other(s).
> >
> > Regards.
> >
> > On Wed, Feb 23, 2011 at 10:52 PM, Khaled Bentebal<
> > khaled.bentebal@consult-ix.fr> wrote:
> >
> >> Hi,
> >>
> >> A client of ours is runnning IDS 11.50.FC5 on AIX and is facing a
> >> problem with a backup running ONBAR.
> >>
> >> It runs fine on several instances on different machines, but is very
> >> slow on one instance. All of the instances are setup the same way along
> >> the same model and the same ONCONFIG.
> >>
> >> ONBAR runs a particular query before performing the backup:
> >> *select ( sum ( npused ) ) from sysdbspaces as D , sysptnhdr as P where
> >> D.dbsnum = TRUNC ( P.partnum/1048576 ) and name = ? *
> >>
> >> This query goes on for ever (*few hours*). We tried to run a query on
> >> sysptnhdr by itself and sysdbspaces also by itself. It seems that the
> query
> >> on
> >> sysptnhdr is very very slow. The same query runs very fast
> (instantanious)
> >> on
> >> the other instances.
> >> We tried to rebuild the sysmaster databse, but nothing came out it.
> >>
> >> Here is more info on this session: any ideas ?
> >>
> -------------------------------------------------------------------------
> >> tid tcb rstcb prty status vp-class name
> >> 2 7000000b162d9f0 0 1 IO Idle 10lio* lio vp 0
> >> 3 7000000b166a288 0 1 IO Idle 11pio* pio vp 0
> >> 4 7000000b1692288 0 1 IO Idle 12aio* aio vp 0
> >> 5 7000000b16ba288 0 1 IO Idle 13msc* msc vp 0
> >> 6 7000000b16f2528 7000000b0adc028 3 sleeping secs: 1 1cpu main_loop()
> >> 7 7000000b1638a50 0 1 running 14soc* soctcppoll
> >> 8 7000000b15236c0 0 2 sleeping forever 1cpu* soctcplst
> >> 9 7000000b1692830 0 2 sleeping forever 3cpu* soctcplst
> >> 10 7000000b16ba4e8 7000000b0adc858 1 sleeping secs: 1 1cpu flush_sub(0)
> >> 11 7000000b16ba7c0 7000000b0add088 1 sleeping secs: 1 1cpu flush_sub(1)
> >> 12 7000000b16baa98 7000000b0add8b8 1 sleeping secs: 1 1cpu flush_sub(2)
> >> 13 7000000b16bad70 7000000b0ade0e8 1 sleeping secs: 1 1cpu flush_sub(3)
> >> 14 7000000b1617300 0 3 running 3cpu* kaio
> >> 31 7000000b196a808 0 3 IO Idle 1cpu* kaio
> >> 37 7000000b1a7a388 7000000b0ade918 2 sleeping secs: 1 1cpu aslogflush
> >> 38 7000000b1a7a660 7000000b0adf148 1 sleeping secs: 125 1cpu btscanner_0
> >> 60 7000000b211c928 7000000b0ae09d8 3 sleeping secs: 1 1cpu* onmode_mon
> >> 61 7000000b211cb88 7000000b0ae01a8 3 sleeping secs: 1 1cpu periodic
> >> 62 7000000b257e028 0 3 IO Idle 4cpu* kaio
> >> 67 7000000b23ec418 7000000b0ae1a38 1 sleeping secs: 10 1cpu dbScheduler
> >> 69 7000000b2337028 7000000b0ae1208 1 sleeping forever 3cpu dbWorker1
> >> 70 7000000b2373568 7000000b0ae2268 1 sleeping forever 1cpu dbWorker2
> >> 73 7000000b21c5148 0 3 IO Idle 6cpu* kaio
> >> 76 7000000b21c55e8 0 3 IO Idle 7cpu* kaio
> >> 77 7000000b21c5ad8 7000000b0adf978 1 cond wait bp_cond 1cpu
> bf_priosweep()
> >> 78 7000000b22131e8 0 3 IO Idle 5cpu* kaio
> >> 87 7000000b5fd5550 0 3 IO Idle 9cpu* kaio
> >> 93 7000000b5fd5bc8 0 3 IO Idle 8cpu* kaio
> >> * 129 7000000b241a930 7000000b0ae3af8 1 IO Wait 3cpu ontape*
> >>
> >> IBM Informix Dynamic Server Version 11.50.FC5 -- On-Line -- Up 02:45:14
> --
> >> 3142096 Kbytes
> >>
> >> Stack for thread: 129 ontape
> >> base: 0x07000000b603d000
> >>
> >> len: 135168
> >>
> >> pc: 0x00000001000429b0
> >>
> >> tos: 0x07000000b605a3b0
> >> state: sleeping
> >>
> >> vp: 3
> >>
> >> 0x00000001000429b0 (oninit)yield_processor_mvp
> >> 0x000000010004d400 (oninit)mt_yield
> >> 0x00000001000d1798 (oninit)mt_aio_wait
> >> 0x00000001000d1cb0 (oninit)mt_aio_start
> >> 0x00000001001e8268 (oninit)chunkio_int
> >> 0x00000001001e5ea8 (oninit)chunkio
> >> 0x00000001001ea52c (oninit)physio
> >> 0x00000001001ef024 (oninit)buffget
> >> 0x00000001001978c0 (oninit)pthdrgetx
> >> 0x000000010019cf80 (oninit)ptalloc
> >> 0x0000000100348664 (oninit)nxtpartp
> >> 0x0000000100345898 (oninit)prptnhdr
> >> 0x000000010033e064 (oninit)pstread
> >> 0x0000000100327288 (oninit)pst_rsread
> >> 0x00000001003306e8 (oninit)rsread
> >> 0x00000001004500fc (oninit)fmread
> >> 0x00000001007e811c (oninit)readseq
> >> 0x00000001007e883c (oninit)gettupl
> >> 0x00000001007ebc78 (oninit)scan_next
> >> 0x000000010089d57c (oninit)hjoin_open
> >> 0x0000000100bf41d0 (oninit)group_open
> >> 0x0000000100551718 (oninit)prepselect
> >> 0x0000000100458130 (oninit)excommand
> >> 0x000000010041c464 (oninit)sq_exselect
> >> 0x00000001002187a0 (oninit)sqmain
> >> 0x0000000100578b50 (oninit)listen_verify
> >> 0x0000000100577294 (oninit)spawn_thread
> >> 0x0000000100d0f93c (oninit)startup
> >>
> >> tid name rstcb flags curstk status
> >> 129 ontape 7000000b0ae3af8 Y--PR-M 12720 cond wait pt_448a8d -
> >>
> >> Memory pools count 2
> >> name class addr totalsize freesize #allocfrag #freefrag
> >> 92 V 7000000b2307040 229376 19480 293 27
> >> 92*O0 V 7000000b5fe9040 4096 808 1 1
> >>
> >> name free used name free used
> >> overhead 0 6576 mtmisc 0 144
> >> scb 0 144 opentable 0 7752
> >> filetable 0 1936 ru 0 600
> >> log 0 16536 temprec 0 2208
> >> keys 0 208 ralloc 0 128072
> >> gentcb 0 1584 ostcb 0 3400
> >> sort 0 104 sqscb 0 21696
> >> sql 0 72 hashfiletab 0 552
> >> osenv 0 3376 buft_buffer 0 4216
> >> sqtcb 0 10760 fragman 0 776
> >> shmblklist 0 704 udr 0 1768
> >>
> >> sqscb info
> >> scb sqscb optofc pdqpriority sqlstats optcompind directives
> >> 7000000b24e9110 7000000b274c028 0 0 0 0 1
> >>
> >> Sess SQL Current Iso Lock SQL ISAM F.E.
> >> Id Stmt type Database Lvl Mode ERR ERR Vers Explain
> >> 92 SELECT sysmaster RR Wait 300 0 0 9.24 Off
> >>
> >> Current SQL statement :
> >>
> >> select ( sum ( npused ) ) from sysdbspaces as D , sysptnhdr as P where D
> >>
> >> .. dbsnum = TRUNC ( P . partnum/ 1048576 ) and name = ?
> >>
> >> Host variables :
> >>
> >> address type flags value
> >>
> >> -----------------------------------------
> >>
> >> 0x07000000b5a2d268 CHAR 0x000 db11_13trnr
> >>
> >> Last parsed SQL statement :
> >>
> >> select ( sum ( npused ) ) from sysdbspaces as D , sysptnhdr as P where D
> >>
> >> .. dbsnum = TRUNC ( P . partnum/ 1048576 ) and name = ?
> >>
> >> mpm13trnr_prodappl(ifx/ifx) /tmp> more sqexplain.out
> >>
> >> QUERY: (OPTIMIZATION TIMESTAMP: 02-22-2011 13:58:12)
> >> ------
> >> select ( sum ( npused ) ) from sysdbspaces as D , sysptnhdr as P where
> >> D.dbsnum = TRUNC ( P.partnum/1048576 ) and name = "de07_13trnr"
> >>
> >> Estimated Cost: 30
> >> Estimated # of Rows Returned: 1
> >>
> >> 1) ifx.d: INDEX PATH
> >>
> >> Filters: ifx.d.name = 'de07_13trnr'
> >>
> >> (1) Index Name: informix.sysdbstab_dbsnum
> >>
> >> Index Keys: dbsnum
> >>
> >> Lower Index Filter: ifx.d.dbsnum> 0
> >>
> >> 2) ifx.p: SEQUENTIAL SCAN
> >>
> >> DYNAMIC HASH JOIN
> >>
> >> Dynamic Hash Filters: ifx.d.dbsnum = trunc(ifx.p.partnum / 1048576 )
> >>
> >> UDRs in query:
> >> --------------
> >>
> >> UDR id : 386
> >>
> >> UDR name: bitval
> >>
> >> UDR id : 386
> >>
> >> UDR name: bitval
> >>
> >> UDR id : 386
> >>
> >> UDR name: bitval
> >>
> >> UDR id : 386
> >>
> >> UDR name: bitval
> >>
> >> *Khaled Bentebal
> >>
> >> Email: khaled.bentebal@consult-ix.fr*
> >>
> >>
> >>
> >>
> >
>
> *******************************************************************************
> >> Forum Note: Use "Reply" to post a response in the discussion forum.
> >>
> >>
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--
Fernando Nunes
Portugal

http://informix-technology.blogspot.com
My email works... but I don't check it frequently...

--0015174be8c467ce74049d084ea6

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