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IDS Forum

Re: Insert into an indexed table is really SLOW!

Posted By: Obnoxio The Clown
Date: Tuesday, 7 July 2009, at 1:32 p.m.

In Response To: Insert into an indexed table is really SLOW! (MIKE DUNHAM-WILKIE)

MIKE DUNHAM-WILKIE wrote:
> I am running into performance problems inserting into an indexed table, using
> Informix 11.50. The following timings for loading into
> compressed/uncompressed, indexed/non-indexed tables using dbload/HPL-Deluxe
> more illustrate the problem. The number of rows inserted is 6 million.
>
> compressed/indexed/DBLoad or HPL/h:mm:ss.d
> Y/Y/DBLoad/3:47:39.9
> Y/N/DBLoad/0:10:58.1
> N/Y/DBLoad/3:31:13.4
> N/N/DBLoad/0:22:46.6
> Y/Y/HPL/3:26:17.6
> Y/N/HPL/0:08:31.7
> N/Y/HPL/3:28:16.1
> N/N/HPL/0:18:45.7
>
> Why are the inserts into the indexed tables so much slower? I would expect
> some performance hit of course, but not this much. I want the indexes left
> intact during the load, hence my use of HPL in Deluxe mode rather than Express
> mode.
>
> I'm using pretty much "out of the box" configuration parameters:
>
> ------------------------------------------------------------------------
> onstat -c:
>
> IBM Informix Dynamic Server Version 11.50.UC4 -- On-Line -- Up 4 days 17:59:
> 49 -- 38212 Kbytes
> Configuration File: /opt/informix/informix.11.50_UC4/etc/onconfig.bcslinuxprod
> ROOTNAME rootdbs
> ROOTOFFSET 0
> MIRROR 0
> MIRRORPATH /opt/IBM/informix/tmp/demo_on.root_mirror
> MIRROROFFSET 0
> PHYSFILE 200000
> PLOG_OVERFLOW_PATH /opt/IBM/informix/tmp
> PHYSBUFF 128
> LOGFILES 49
> LOGSIZE 10000
> DYNAMIC_LOGS 2
> LOGBUFF 64
> LTXHWM 70
> LTXEHWM 80
> CONSOLE /work1/stat/bcslinuxprod_console.log
> TBLTBLFIRST 0
> TBLTBLNEXT 0
> TBLSPACE_STATS 1
> DBSPACETEMP temp1db
> SBSPACETEMP temp1sb
> SBSPACENAME temp1sb
> SYSSBSPACENAME temp1sbifmx
> ONDBSPACEDOWN 2
> NETTYPE ipcshm,1,50,CPU
> LISTEN_TIMEOUT 60
> MAX_INCOMPLETE_CONNECTIONS 1024
> FASTPOLL 1
> MULTIPROCESSOR 0
> VP_MEMORY_CACHE_KB 0
> SINGLE_CPU_VP 0
> CLEANERS 8
> AUTO_AIOVPS 1
> DIRECT_IO 0
> LOCKS 20000
> DEF_TABLE_LOCKMODE page
> RESIDENT 0
> SHMBASE 0x44000000L
> SHMVIRTSIZE 32656
> SHMADD 8192
> EXTSHMADD 8192
> SHMTOTAL 0
> SHMVIRT_ALLOCSEG 0,3
> SHMNOACCESS
> CKPTINTVL 300
> AUTO_CKPTS 1
> RTO_SERVER_RESTART 0
> BLOCKTIMEOUT 3600
> TXTIMEOUT 300
> DEADLOCK_TIMEOUT 60
> HETERO_COMMIT 0
> TAPEBLK 32
> TAPESIZE 0
> LTAPEBLK 32
> LTAPESIZE 0
> BAR_DEBUG 0
> BAR_MAX_BACKUP 0
> BAR_RETRY 1
> BAR_NB_XPORT_COUNT 20
> BAR_XFER_BUF_SIZE 31
> RESTARTABLE_RESTORE ON
> BAR_PROGRESS_FREQ 0
> BAR_BSALIB_PATH
> BACKUP_FILTER
> RESTORE_FILTER
> BAR_PERFORMANCE 0
> ISM_DATA_POOL ISMData
> ISM_LOG_POOL ISMLogs
> DD_HASHSIZE 31
> DD_HASHMAX 10
> DS_HASHSIZE 31
> DS_POOLSIZE 127
> PC_HASHSIZE 31
> PC_POOLSIZE 127
> STMT_CACHE 0
> STMT_CACHE_HITS 0
> STMT_CACHE_SIZE 512
> STMT_CACHE_NOLIMIT 0
> STMT_CACHE_NUMPOOL 1
> USEOSTIME 0
> STACKSIZE 32
> ALLOW_NEWLINE 0
> USELASTCOMMITTED NONE
> FILLFACTOR 90
> MAX_FILL_DATA_PAGES 0
> ONLIDX_MAXMEM 5120
> MAX_PDQPRIORITY 100
> DS_MAX_QUERIES
> DS_TOTAL_MEMORY
> DS_MAX_SCANS 1048576
> DS_NONPDQ_QUERY_MEM 128
> DATASKIP
> OPTCOMPIND 2
> DIRECTIVES 1
> EXT_DIRECTIVES 0
> OPT_GOAL -1
> IFX_FOLDVIEW 0
> AUTO_REPREPARE 1
> RA_PAGES 64
> RA_THRESHOLD 16
> EXPLAIN_STAT 0
> IFX_EXTEND_ROLE 0
> SECURITY_LOCALCONNECTION
> UNSECURE_ONSTAT
> ADMIN_USER_MODE_WITH_DBSA
> ADMIN_MODE_USERS
> SSL_KEYSTORE_LABEL
> PLCY_POOLSIZE 127
> PLCY_HASHSIZE 31
> USRC_POOLSIZE 127
> USRC_HASHSIZE 31
> STAGEBLOB
> OPCACHEMAX 0
> ENCRYPT_HDR
> ENCRYPT_SMX
> ENCRYPT_CDR 0
> ENCRYPT_CIPHERS
> ENCRYPT_MAC
> ENCRYPT_MACFILE
> ENCRYPT_SWITCH
> CDR_EVALTHREADS 1,2
> CDR_DSLOCKWAIT 5
> CDR_QUEUEMEM 4096
> CDR_NIFCOMPRESS 0
> CDR_SERIAL 0
> CDR_DBSPACE
> CDR_QHDR_DBSPACE
> CDR_QDATA_SBSPACE
> CDR_MAX_DYNAMIC_LOGS 0
> CDR_SUPPRESS_ATSRISWARN
> DRAUTO 0
> DRINTERVAL 30
> DRTIMEOUT 30
> HA_ALIAS
> DRIDXAUTO 0
> LOG_INDEX_BUILDS
> SDS_ENABLE
> SDS_TIMEOUT 20
> SDS_TEMPDBS
> SDS_PAGING
> REDIRECTED_WRITES 0
> FAILOVER_CALLBACK
> TEMPTAB_NOLOG 0
> ON_RECVRY_THREADS 1
> OFF_RECVRY_THREADS 10
> DUMPSHMEM 1
> DUMPGCORE 0
> DUMPCORE 0
> DUMPCNT 1
> ALRM_ALL_EVENTS 0
> STORAGE_FULL_ALARM 600,3
> RAS_PLOG_SPEED 14900
> RAS_LLOG_SPEED 742
> EILSEQ_COMPAT_MODE 0
> QSTATS 0
> WSTATS 0
> JVPJAVALIB /bin
> JVPJAVAVM jvm
> AUTO_LRU_TUNING 1
> ROOTPATH /opt/IBM/informix/demo/server/online_root
> MSGPATH /work1/stat/bcslinuxprod_online.log
> TAPEDEV /dev/null
> LTAPEDEV /dev/null
> DBSERVERNAME bcslinuxprod
> DBSERVERALIASES
> SERVERNUM 0
> ALARMPROGRAM /opt/IBM/informix/etc/alarmprogram.sh
> DRLOSTFOUND /opt/IBM/informix/etc/dr.lostfound
> BAR_ACT_LOG /work1/stat/bar_act.log
> BAR_DEBUG_LOG /work1/stat/bar_debug.log
> SYSALARMPROGRAM /opt/IBM/informix/etc/evidence.sh
> DUMPDIR /work1/stat
> JVPJAVAHOME /opt/IBM/informix/extend/krakatoa/jre
> JVPHOME /opt/IBM/informix/extend/krakatoa/
> JVPPROPFILE /opt/IBM/informix/extend/krakatoa/.jvpprops
> JVPLOGFILE /opt/IBM/informix/demo/server/jvp.log
> JVPCLASSPATH
> /opt/IBM/informix/extend/krakatoa/krakatoa.jar:/opt/IBM/informix/ex
> tend/krakatoa/jdbc.jar
> ROOTSIZE 200000
> BUFFERPOOL size=2K,buffers=1000,lrus=8,lru_min_dirty=50.000000,lru_max_dirt
> y=60.000000
> VPCLASS cpu,num=1,noage
> BTSCANNER num=1,threshold=5000,rangesize=-1,alice=6
> UPDATABLE_SECONDARY 0
> --------------------------------------------------------------------
>
> Here is my table definition:
>
> --------------------------------------------------------------------
> create table "mdwilkie".noaa_sst_conventional_hpl_comp_24000000
> (
>
> type_of_observation integer,
>
> source_of_observation integer,
>
> dt datetime year to second,
>
> latitude float,
>
> longitude float,
>
> sst float,
>
> reliability integer,
>
> solar_zenith_angle float,
>
> satellite_zenith_angle float,
>
> analyzed_field_sst float,
>
> internal_error float,
>
> solar_azimuth_angle float,
>
> climatological_sst float,
>
> beginning_row integer,
>
> beginning_column integer,
>
> avhrr_ch_1_average float,
>
> avhrr_ch_2_average float,
>
> avhrr_ch_3_average float,
>
> avhrr_ch_4_average float,
>
> avhrr_ch_5_average float,
>
> space_view_ch_1 float,
>
> space_view_ch_2 float,
>
> space_view_ch_3 float,
>
> ch_4_blackbody_temperature float,
>
> ch_5_blackbody_temperature float,
>
> year_of_observation integer
> ) extent size 16 next size 16 lock mode page;
>
> start violations table for "mdwilkie".noaa_sst_conventional_hpl_comp_24000000
>
> using noaa_sst_conventional_hpl_comp_24000000_vio,
> noaa_sst_conventional_hpl_comp_24000000_dia;
>
> create index "mdwilkie".noaa_sst_conventional_hpl_comp_24000000_dt_idx
>
> on "mdwilkie".noaa_sst_conventional_hpl_comp_24000000 (dt)
>
> using btree in miscdbind;
> create index "mdwilkie".noaa_sst_conventional_hpl_comp_24000000_latitude_idx
>
> on "mdwilkie".noaa_sst_conventional_hpl_comp_24000000 (latitude)
>
> using btree in miscdbind;
> create index "mdwilkie".noaa_sst_conventional_hpl_comp_24000000_longitude_idx
>
> on "mdwilkie".noaa_sst_conventional_hpl_comp_24000000 (longitude)
>
> using btree in miscdbind;
>
> --------------------------------------------------------------------------------
>
> Note that my default dbspace (miscdbtab) is different from my index dbspace
> (miscdbind), but both are stored on the same disk (the only disk on my linux
> box). Also I'm using just 1 CPU.
>
> Here are the last few lines from the log file:
>
> -----------------------------------------------------------------------------
> 09:41:42 Maximum server connections 4
> 09:41:42 Checkpoint Statistics - Avg. Txn Block Time 0.000, # Txns blocked 1,
> Plog used 26253, Llog used 7
>
> 09:42:56 Checkpoint Completed: duration was 2 seconds.
> 09:42:56 Tue Jul 7 - loguniq 1610, logpos 0x26466a4, timestamp: 0x7c24d7c1
> Interval: 12113
>
> 09:42:56 Maximum server connections 5
> 09:42:56 Checkpoint Statistics - Avg. Txn Block Time 0.000, # Txns blocked 2,
> Plog used 26253, Llog used 7
>
> 09:44:09 Checkpoint Completed: duration was 3 seconds.
> 09:44:09 Tue Jul 7 - loguniq 1610, logpos 0x264e4b0, timestamp: 0x7c2697f5
> Interval: 12114
>
> 09:44:09 Maximum server connections 5
> 09:44:09 Checkpoint Statistics - Avg. Txn Block Time 0.000, # Txns blocked 1,
> Plog used 26253, Llog used 8
>
> 09:45:34 Checkpoint Completed: duration was 0 seconds.
> 09:45:34 Tue Jul 7 - loguniq 1610, logpos 0x2655560, timestamp: 0x7c285148
> Interval: 12115
>
> 09:45:34 Maximum server connections 5
> 09:45:34 Checkpoint Statistics - Avg. Txn Block Time 0.000, # Txns blocked 1,
> Plog used 26253, Llog used 7
>
> -----------------------------------------------------------------------
> My linux box has the following description:
>
> CPU: Intel Pentium D, 3.0 GHz, 2MB Cache, 32 bit
> RAM: 2 GB
> OS: Fedora Core 7
>
> Here are the first few lines of output from "top":
>
> -----------------------------------------------------------------------
> top - 09:50:39 up 11 days, 23:10, 12 users, load average: 21.83, 21.41, 21.35
> Tasks: 230 total, 1 running, 229 sleeping, 0 stopped, 0 zombie
> Cpu(s): 2.8%us, 2.3%sy, 0.0%ni, 40.5%id, 54.2%wa, 0.0%hi, 0.2%si, 0.0%st
> Mem: 2066880k total, 2015236k used, 51644k free, 14972k buffers
> Swap: 2031608k total, 196k used, 2031412k free, 1559480k cached
>
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 3982 informix 5 -10 59888 45m 43m S 5 2.2 39:00.35 oninit
> 3996 root 6 -10 59868 6464 5124 D 1 0.3 1:21.52 oninit
> 9939 informix 15 0 2340 1088 788 R 1 0.1 0:00.06 top
> 3988 root 6 -10 59876 7440 6096 D 0 0.4 1:49.16 oninit
> 3991 root 6 -10 59876 6916 5572 D 0 0.3 1:38.22 oninit
> 3992 root 6 -10 59876 6680 5336 D 0 0.3 1:33.69 oninit
> 3994 root 5 -10 59868 6508 5168 D 0 0.3 1:26.88 oninit
> 3995 root 5 -10 59876 6772 5428 D 0 0.3 1:24.17 oninit
> 3997 root 6 -10 59868 6276 4936 D 0 0.3 1:18.85 oninit
> 4001 root 5 -10 59868 6312 4972 D 0 0.3 1:10.82 oninit
> 4003 root 5 -10 59876 6388 5044 D 0 0.3 1:08.10 oninit
> 4004 root 6 -10 59868 6048 4708 D 0 0.3 1:06.35 oninit
> 4006 root 6 -10 59876 6356 5012 D 0 0.3 1:03.41 oninit
> 4007 root 6 -10 59868 6320 4980 D 0 0.3 1:01.70 oninit
> ------------------------------------------------------------------------
>
> The machine appears to be heavily I/O bound.
>
> I don't have the option of splitting table and index onto different disks,
> disabling the index during the load, or adding more CPU's (I'm not sure if
> this would make a difference anyway). Do I have any other options? Are there
> some specific configuration parameters that I should try adjusting?

Is this a trick question?

Why is your bufferpool so small? Why is your index so mandatory? Why are
you worried about performance with such a noddy box? Have you considered
using bigger pages?

--
Cheers,
Obnoxio The Clown

http://obotheclown.blogspot.com

--
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dangerous content by OpenProtect(http://www.openprotect.com), and is
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