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IDS Forum
AW: AW: Analysis of activities during checkpoint.
Posted By: Andreas.KUTSCHE@spar.at
Date: Wednesday, 2 July 2008, at 8:28 a.m.
In Response To: Re: AW: Analysis of activities during checkpoint. (VARTIKA AGRAWAL)
Hello,
you should change
NUMAIOVPS 2 # Number of IO vps
to something like
NUMAIOVPS 100
That should give you a performance boost - not only at checkpoint times.
You can add AIO-VPs online with onmode -p +<number> aio
You can watch IO processes with
onstat -g iov
If io/wup is high (2 or higher) you should add even more AIO-VPs.
If that doesn't reduce checkpoint times dramatically, you could try to lower
LRU_MIN_DIRTY and LRU_MAX_DIRTY to smaller (fractional) values:
LRU_MAX_DIRTY 1 (or 0.5)
LRU_MIN_DIRTY 0.5 (or 0.3)
For the INSERT operations:
Monitor several checkpoints - do you see critical INSERTs on that table?
If the Indices are detached (dbschema -ss -d <database> -t <table>) - check
size of the index fragments with: oncheck -pt <database>:<table>
If one/many indexes are larger than the table an index recreation could be
worth the effort.
If you habe attached indexes: oncheck -pt gives the usage of table pages
(data, other) - if you don't have binary data in the table (text, raw fields), the other pages are index pages. If other is much higher than data,
an index recreation ....
Attention: The DROP of attached indexes can need a lot of time!
Index creation should be done with PDQ_PRIORITY and PSORT_NPROCS set (for a quick start 50 , 8 ) - I'm not sure if MAX_PDQPRIORITY must be set to 100 ,
could be done with an onmode option.
Regards,
Andreas
>
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-----Ursprüngliche Nachricht-----
> Von: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] Im Auftrag von
> VARTIKA AGRAWAL
> Gesendet: Mittwoch, 02. Juli 2008 13:23
> An: ids@iiug.org
> Betreff: Re: AW: Analysis of activities during checkpoint. [12547]
>
> Thank you andreas,
>
> Please have a look at the onconfig entries -
> ROOTNAME rootdbs # Root dbspace name
> ROOTPATH /informix/P10/sapdata/physdev1/data01
> ROOTOFFSET 16 # Offset of root dbspace into device (Kbytes)
> ROOTSIZE 200000 # Size of root dbspace (Kbytes)
> MIRROR 1 # Mirroring flag (Yes = 1, No = 0)
> MIRRORPATH # Path for device containing mirrored root
> MIRROROFFSET 0 # Offset into mirrored device (Kbytes)
> PHYSDBS physdbs # Location (dbspace) of physical log
> PHYSFILE 800000 # Physical log file size (Kbytes)
> LOGFILES 600 # Number of logical log files 20/09/99
> LOGSIZE 500 # initial (!) Logical log size (Kbytes)
> MSGPATH /informix/P10/online.db10.p10.log # System message log file path
> CONSOLE /informix/P10/console.db10.p10.log # System console message path
> ALARMPROGRAM /informix/P10/etc/infodb_check.sh # Alarm program path
> TAPEDEV /dev/rmt/dbbkp # Tape device path
> TAPEBLK 1024 # Tape block size (Kbytes)
> TAPESIZE 208666624 # Maximum amount of data to put on tape (Kbytes)
> LTAPEDEV /dev/rmt/logbkp # Log tape device path
> LTAPEBLK 256 # Log tape block size (Kbytes)
> LTAPESIZE 30000000 # Max amount of data to put on log tape (Kbytes)
> STAGEBLOB # INFORMIX-OnLine/Optical staging area
> SERVERNUM 0 # Unique id corresponding to a OnLine instance
> DBSERVERNAME db10p10tcp # Name of default database server
> DBSERVERALIASES db10p10shm # List of alternate dbservernames
> NETTYPE ipcshm,,, # Override sqlhosts nettype parameters
> NETTYPE tlitcp,2,190,CPU # Override sqlhosts nettype parameters
> DEADLOCK_TIMEOUT 60 # Max time to wait of lock in distributed env.
> RESIDENT 0 # Forced residency flag (Yes = 1, No = 0)
> MULTIPROCESSOR 1 # 0 for single-processor, 1 for multi-processor
> NUMCPUVPS 39 # Number of User (cpu) vps
> SINGLE_CPU_VP 0 # If non-zero, limit number of cpu vps to one
> MUTEX_WAIT_LISTS 0 # If non-zero, force use of mutex wait lists
> NOAGE 0 # Process aging
> AFF_SPROC 0 # Affinity start processor
> AFF_NPROCS 0 # Affinity number of processors
> LOCKS 8000000 # Maximum number of locks
> BUFFERS 1900000 # Maximum number of shared buffers
> NUMAIOVPS 2 # Number of IO vps
> PHYSBUFF 1024 # Physical log buffer size (Kbytes)
> LOGBUFF 32 # Logical log buffer size (Kbytes)
> LOGSMAX 625 # Maximum number of logical log files
> CLEANERS 125 # Number of buffer cleaner processes
> SHMBASE 0x10a000000 # Shared memory base address
> SHMVIRTSIZE 16777216 # initial virtual shared memory segment size
> SHMADD 500000 # Size of new shared memory segments (Kbytes)
> SHMTOTAL 0 # Total shared memory (Kbytes). 0=>unlimited
> CKPTINTVL 900 # Check point interval (in sec)[changed on 13-10-2002]
> LRUS 110 # Numbe2 of LRU queues
> LRU_MAX_DIRTY 2 # LRU percent dirty begin cleaning limit
> LRU_MIN_DIRTY 1 # LRU percent dirty end cleaning limit
> LTXHWM 45 # Long transaction high water mark percentage
> LTXEHWM 70 # Long transaction high water mark (exclusive)
> TXTIMEOUT 0x12c # Transaction timeout (in sec)
> STACKSIZE 256 # Stack size (Kbytes)
> OFF_RECVRY_THREADS 10 # Default number of offline worker threads
> ON_RECVRY_THREADS 10 # Default number of online worker threads
> BAR_BSALIB_PATH /usr/lib/sparcv9/ibsad001.so
> BAR_ACT_LOG /tmp/bar_act.log
> BAR_MAX_BACKUP 0
> BAR_RETRY 3
> BAR_NB_XPORT_COUNT 50
> BAR_XFER_BUF_SIZE 31
> RA_PAGES 32 # Number of pages to attempt to read ahead
> RA_THRESHOLD 30 # Number of pages left before next group
> DBSPACETEMP tmpdbs1,tmpdbs2,tmpdbs3 # Default temp dbspaces
> DUMPDIR /tmp # Preserve diagnostics in this directory
> DUMPSHMEM 0 # Dump a copy of shared memory
> DUMPGCORE 0 # Dump a core image using 'gcore'
> DUMPCORE 0 # Dump a core image (Warning:this aborts OnLine)
> DUMPCNT 1 # Number of shared memory or gcore dumps for
> FILLFACTOR 90 # Fill factor for building indexes
> USEOSTIME 0 # 0: use internal time(fast), 1: get time from OS(slow)
> MAX_PDQPRIORITY 0 # Maximum allowed pdqpriority
> DS_MAX_QUERIES # Maximum number of decision support queries
> DS_TOTAL_MEMORY # Decision support memory (Kbytes)
> DS_MAX_SCANS 1048576 # Maximum number of decision support scans
> DATASKIP off
> OPTCOMPIND 2 # To hint the optimizer
> ONDBSPACEDOWN 1 # Dbspace down option: 0 = CONTINUE, 1 = ABORT, 2 = WAIT
> LBU_PRESERVE 1 # Preserve last log for log backup
> OPCACHEMAX 128 # Maximum optical cache size (Kbytes)
> HETERO_COMMIT 0
> DD_HASHSIZE 613 # Length of DD Hash; 03-Nov-94
> DD_HASHMAX 30 # Width of DD Hash; 03-Nov-94
> CDR_LOGBUFFERS 2048 # size of log reading buffer pool (Kbytes)
> CDR_EVALTHREADS 1,1 # evaluator threads (per-cpu-vp,additional)
> CDR_DSLOCKWAIT 5 # DS lockwait timeout (seconds)
> CDR_QUEUEMEM 4096 # Maximum amount of memory for any CDR queue
> SYSALARMPROGRAM
> /informix/P10/etc/evidence.sh # System Alarm program path
> TBLSPACE_STATS 1
> CDR_LOGDELTA 30 # % of log space allowed in queue memory
> CDR_NUMCONNECT 16 # Expected connections per server
> CDR_NIFRETRY 300 # Connection retry (seconds)
> CDR_NIFCOMPRESS 0 # Link level compression (-1 never, 0 none, 9 max)
> ISM_DATA_POOL ISMData # If the data pool name is changed, be sure to
> ISM_LOG_POOL ISMLogs
> OPT_GOAL -1
> DIRECTIVES 1
> RESTARTABLE_RESTORE off
> BTSCANNER num=6,priority=high,threshold=600000,rangesize=500
> DYNAMIC_LOGS 2
> CDR_SERIAL 0,0 # Serial Column Sequence
> CDR_DBSPACE # dbspace for syscdr database
> CDR_QHDR_DBSPACE # CDR queue dbspace (default same as catalog)
> CDR_QDATA_SBSPACE # List of CDR queue smart blob spaces
> CDR_MAX_DYNAMIC_LOGS 0 # Dynamic log addition disabled by default
> BAR_DEBUG_LOG /tmp/bar_dbug.log # ON-Bar Debug Log - not in /tmp please
> BAR_PROGRESS_FREQ 0
> SBSPACENAME # Default smartblob space name - this is where blobs
> SYSSBSPACENAME # Default smartblob space for use by the Informix
> BLOCKTIMEOUT 3600 # Default timeout for system block
> ALLOW_NEWLINE 0 # embedded newlines(Yes = 1, No = 0 or anything but 1)
>
> The no of dirty buffers in onstat -R keeps on changing ( going up and down
> without any specific pattern).We do not use KAIO. we do use raw devices
> for
> chunks.
>
> This time onstat -u | grep X gave one entry which was an INSERT operation.
> This query was inserting data into a table thru a view. The underlying
> table
> has got 8 index but the same job runs fine for most of the time.
> how can i find the state of an index ie degenerated or healthy. ??
>
> pl. explain.
>
> regards,
> vartika.
>
>
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