Significance of 'migr' statistics shown in mpstat

One column of the 'mpstat' output is 'migr' - rate of "thread migrations (to another processor)". What is the significance of this statistic? What does it tell us if there are a lot of threads migration from this CPU to others? Or more outgoing migration on this CPU than on others?
Perhaps if there are a lot of outgoing migrations, coupled with a busy CPU, as shown in the "idl" (percent idel time) statistic, I may infer from it that because the CPU is busy with executing one of the threads, other threads are going to other idle CPUs. But there are also high 'migr' on other CPUs. Sometimes even higher than the busy CPU. I guess if both "outgoing migrations" and "incoming migrations" statistic are shown, things would be clearer. Anyway, how should we interpret the 'migr' statistic?
I have a dual-processor, dual core Opteron 270 node, i.e. 4 cores in total. When I am not running any user program, there are much more activity, in terms of 'intr' (interupts), 'ithr' (interrupts as threads), 'csw' (context switches), and 'icsw' (involuntary context switches), as shown on mpstat, on CPU0 than other 3 CPUs. Why does not Solaris 10 more evenly allocate the load on all 4 cores?
And who do 'interrupts as threads', 'involuntary context switches' mean?

'involuntary context switches' means when a process/thread is stopped by the kernel by instance. The thread got all his quantum, and another thread/process can access the cpu, or by instance when a thread/process of a higher level need to get the cpu, and hence the kernel preempt a thread/process running on cpu.
In contrast, 'voluntary' context switche happends ( csw column in mpstat ) when by instance a thread needs to do a IO operation, and hence preempt him-self, and he has nothing to do than waiting for the IO operation to complete, and let another thread to use the cpu.

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Hi All,
I am trying to import an existing schema in Oracle 10g.
I am using the impdp utility.
The export dump consists of the complete schema (metadata and data).
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1945A21C 6300 package body SYS.KUPW$WORKER
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Tanuja

Hi,
See related threads here:
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Error ORA-39125 and ORA-04063 during export for transportable tablespace
ORA-39125: Worker unexpected fatal error in string while calling string [string]
Cause: An unhandled exception was detected internally within the worker process for the Data Pump job while calling the specified external routine. This is an internal error. Additional information may be supplied.
Action: If problem persists, contact Oracle Customer Support.
Hope this helps . . .
Donald K. Burleson
Oracle Press author
Author of "Oracle Tuning: The Definitive Reference"
http://www.rampant-books.com/book_2005_1_awr_proactive_tuning.htm

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I have attached the output of ps -ef, and I notice there are many instances of some processes, like:
migration
ksoftirqd
kblockd
oraclewcs
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ade # mpstat -P ALL
Linux 2.6.18-238.1.1.el5 (scea4nms2001) 12/30/14
16:31:16 CPU %user %nice %sys %iowait %irq %soft %steal %idle intr/s
16:31:16 all 24.26 0.00 2.30 8.62 0.13 1.46 0.00 63.23 1227.89
16:31:16 0 22.01 0.00 1.82 0.34 0.00 1.28 0.00 74.55 251.97
16:31:16 1 21.97 0.00 1.95 0.35 0.07 1.49 0.00 74.16 66.04
16:31:16 2 23.41 0.00 1.96 0.30 0.00 1.37 0.00 72.96 0.00
16:31:16 3 23.41 0.00 1.95 0.30 0.00 1.37 0.00 72.97 0.00
16:31:16 4 23.39 0.00 1.95 0.30 0.00 1.38 0.00 72.98 0.00
16:31:16 5 23.35 0.00 1.95 0.29 0.00 1.38 0.00 73.02 0.00
16:31:16 6 23.42 0.00 1.95 0.30 0.00 1.38 0.00 72.96 0.00
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16:31:16 11 25.39 0.00 2.15 11.11 0.00 1.19 0.00 60.16 0.00
16:31:16 12 25.34 0.00 2.15 11.11 0.00 1.19 0.00 60.21 0.00
16:31:16 13 25.24 0.00 2.14 11.12 0.00 1.19 0.00 60.30 2.36
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ade #

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Hi,
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syscl usr sys wt idl
0 1 0 109 16 5 319 7 20 11 1
1 408 2 3 22 73
1 4 0 128 674 566 321 7 20 13 1
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CPU minf mjf xcal intr ithr csw icsw migr smtx srw
syscl usr sys wt idl
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0 474 2 3 21 74
1 5 0 122 653 547 296 5 17 14 0
0 373 1 1 19 79
Thanks,
Paul Ng

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1. This procedure is a diagnostic test. It changes nothing, for better or worse, and therefore will not, in itself, solve the problem. But with the aid of the test results, the solution may take a few minutes, instead of hours or days.
Don't be put off merely by the seeming complexity of these instructions. The process is much less complicated than the description. You do harder tasks with the computer all the time.
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Here's a summary of what you need to do, if you choose to proceed:
Copy a line of text in this window to the Clipboard.
Paste into the window of another application.
Wait for the test to run. It usually takes a few minutes.
Paste the results, which will have been copied automatically, back into a reply on this page.
The sequence is: copy, paste, wait, paste again. You don't need to copy a second time. Details follow.
4. You may have started the computer in "safe" mode. Preferably, these steps should be taken in “normal” mode, under the conditions in which the problem is reproduced. If the system is now in safe mode and works well enough in normal mode to run the test, restart as usual. If you can only test in safe mode, do that.
5. If you have more than one user, and the one affected by the problem is not an administrator, then please run the test twice: once while logged in as the affected user, and once as an administrator. The results may be different. The user that is created automatically on a new computer when you start it for the first time is an administrator. If you can't log in as an administrator, test as the affected user. Most personal Macs have only one user, and in that case this section doesn’t apply. Don't log in as root.
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PATH=/usr/bin:/bin:/usr/sbin:/sbin:/usr/libexec;clear;cd;p=(Software Hardware Memory Diagnostics Power FireWire Thunderbolt USB Fonts 51 4 1000 25 5120 KiB/s 1024 85 \\b%% 20480 1 MB/s 25000 ports ' \*AutoCad \*dropbox \*GoogleDr\* vidinst\* ' DYLD_INSERT_LIBRARIES\ DYLD_LIBRARY_PATH -86 ` route -n get default|awk '/e:/{print $2}' ` 25 N\\/A down up 102400 25600 recvfrom sendto CFBundleIdentifier 25 25 25 1000 MB com.apple.AirPortBaseStationAgent 464843899 );N5=${#p[@]};p[N5]=` networksetup -listnetworkserviceorder|awk ' NR>1 { sub(/^$[0-9]+$ /,"");n=$0;getline;} $NF=="'${p[26]}')" { sub(/.$/,"",$NF);print n;exit;} ' `;f=('\n%s: %s\n' '\n%s\n\n%s\n' '\nRAM details\n%s\n' %s\ %s '%s\n-\t%s\n' );S0() { echo ' { q=$NF+0;$NF="";u=$(NF-1);$(NF-1)="";gsub(/^ +| +$/,"");if(q>='${p[$1]}') printf("%s (UID %s) is using %s '${p[$2]}'",$0,u,q);} ';};s=(' /^ *$|CSConfigDot/d;s/^ */ /;s/[-0-9A-Fa-f]{22,}/UUID/g;s/(ochat)\.[^.]+(\..+)/\1\2/;/Shared/!s/\/Users\/[^/]+/~/g ' ' s/^ +//;5p;6p;8p;12p;' ' {sub(/^ +/,"")};NR==6;NR==13&&$2<'${p[10]} ' 1s/://;3,6d;/[my].+:/d;s/^ {4}//;H;${ g;s/\n$//;/s: [^EO]|x([^08]|02[^F]|8[^0])/p;} ' ' 5h;6{ H;g;/P/!p;} ' ' ($1~/^Cy/&&$3>'${p[11]}')||($1~/^Cond/&&$2!~/^N/) ' ' /:$/{ N;/:.+:/d;s/ *://;b0'$'\n'' };/^ *(V.+ [0N]|Man).+ /{ s/ 0x.... //;s/[()]//g;s/(.+: )(.+)/ (\2)/;H;};$b0'$'\n'' d;:0'$'\n'' x;s/\n\n//;/Apple[ ,]|Intel|SMSC/d;s/\n.*//;/\)$/p;' ' s/^.*C/C/;H;${ g;/No th|pms/!p;} ' '/= [^GO]/p' '{$1=""};1' ' /Of/!{ s/^.+is |\.//g;p;} ' ' $0&&!/ / { n++;print;} END { if(n<200) print "com.apple.";} ' ' $3~/[0-9]:[0-9]{2}$/ { gsub(/:[0-9:a-f]{14}/,"");} { print|"tail -n'${p[12]}'";} ' ' NR==2&&$4<='${p[13]}' { print $4;} ' ' END { $2/=256;if($2>='${p[15]}') print int($2) } ' ' NR!=13{next};{sub(/[+-]$/,"",$NF)};'"`S0 21 22`" 'NR!=2{next}'"`S0 37 17`" ' NR!=5||$8!~/[RW]/{next};{ $(NF-1)=$1;$NF=int($NF/10000000);for(i=1;i<=3;i++){$i="";$(NF-1-i)="";};};'"`S0 19 20`" 's:^:/:p' '/\.kext\/(Contents\/)?Info\.plist$/p' 's/^.{52}(.+) <.+/\1/p' ' /Launch[AD].+\.plist$/ { n++;print;} END { print "'${p[41]}'";if(n<200) print "/System/";} ' '/\.xpc\/(Contents\/)?Info\.plist$/p' ' NR>1&&!/0x|\.[0-9]+$|com\.apple\.launchctl\.(Aqua|Background|System)$|'${p[41]}'/ { print $3;} ' ' /\.(framew|lproj)|\):/d;/plist:|:.+(Mach|scrip)/s/:[^:]+//p ' '/root/p' ' !/\/Contents\/.+\/Contents|Applic|Autom|Frameworks/&&/Lib.+\/Info.plist$/ { n++;print;} END { if(n<1000) print "/System/";} ' '/^\/usr\/lib\/.+dylib$/p' ' /Temp|emac/ { next;} /(etc|Preferences|Launch[AD].+)\// { sub(".(/private)?","");n++;print;} END { print "'${p[41]}'.plist\t'${p[42]}'";if(n<500) print "Launch";} ' ' /\/(Contents\/.+\/Contents|Frameworks)\/|\.wdgt\/.+\.([bw]|plu)/d;p;' 's/\/(Contents\/)?Info.plist$//;p' ' { gsub("^| |\n","\\|\\|kMDItem'${p[35]}'=");sub("^...."," ") };1 ' p '{print $3"\t"$1}' 's/\'$'\t''.+//p' 's/1/On/p' '/Prox.+: [^0]/p' '$2>'${p[9]}'{$2=$2-1;print}' ' BEGIN { i="'${p[26]}'";M1='${p[16]}';M2='${p[18]}';M3='${p[31]}';M4='${p[32]}';} !/^A/ { next;} /%/ { getline;if($5<M1) a="user "$2"%, system "$4"%";} /disk0/&&$4>M2 { b=$3" ops/s, "$4" blocks/s";} $2==i { if(c) { d=$3+$4+$5+$6;next;};if($4>M3||$6>M4) c=int($4/1024)" in, "int($6/1024)" out";} END { if(a) print "CPU: "a;if(b) print "I/O: "b;if(c) print "Net: "c" (KiB/s)";if(d) print "Net errors: "d" packets/s";} ' ' /r\[0\] /&&$NF!~/^1(0|72\.(1[6-9]|2[0-9]|3[0-1])|92\.168)\./ { print $NF;exit;} ' ' !/^T/ { printf "(static)";exit;} ' '/apsd|OpenD/!s/:.+//p' ' (/k:/&&$3!~/(255\.){3}0/ )||(/v6:/&&$2!~/A/ ) ' ' $1~"lR"&&$2<='${p[25]}';$1~"li"&&$3!~"wpa2";' ' BEGIN { FS=":";} { n=split($3,a,".");sub(/_2[01].+/,"",$3);print $2" "$3" "a[n]" "$1;b=b$1;} END { if(b) print("\n\t* Code injection");} ' ' NR!=4{next} {$NF/=10240} '"`S0 27 14`" ' END { if($3~/[0-9]/)print$3;} ' ' BEGIN { L='${p[36]}';} !/^[[:space:]]*(#.*)?$/ { l++;if(l<=L) f=f"\n "$0;} END { F=FILENAME;if(!F) exit;if(!f) f="\n [N/A]";"file -b "F|getline T;if(T!~/^(AS.+ (En.+ )?text$|POSIX sh.+ text ex)/) F=F" ("T")";printf("\nContents of %s\n%s\n",F,f);if(l>L) printf("\n ...and %s more line(s)\n",l-L);} ' ' /^ +[NP].+ =/h;/^( +D.+[{]|[}])/{ g;s/.+= //p;};' 's/0/Off/p' ' END{print NR} ' ' /id: N|te: Y/{i++} END{print i} ' ' / / { print "'"${p[28]}"'";exit;};1;' '/ en/!s/\.//p' ' NR!=13{next};{sub(/[+-M]$/,"",$NF)};'"`S0 39 40`" ' $10~/$L/&&$9!~"localhost" { sub(/.+:/,"",$9);print $1": "$9;} ' '/^ +r/s/.+"(.+)".+/\1/p' 's/(.+\.wdgt)\/(Contents\/)?Info\.plist$/\1/p' 's/^.+\/(.+)\.wdgt$/\1/p' );c1=(system_profiler pmset\ -g nvram fdesetup find syslog df vm_stat sar ps sudo\ crontab sudo\ iotop top pkgutil 'PlistBuddy 2>&1 -c "Print' whoami cksum kextstat launchctl sudo\ launchctl crontab 'sudo defaults read' stat lsbom mdfind ' for i in ${p[24]};do ${c1[18]} ${c2[27]} $i;done;' defaults\ read scutil sudo\ dtrace sudo\ profiles sed\ -En awk /S*/*/P*/*/*/C*/*/airport networksetup mdutil sudo\ lsof test );c2=(com.apple.loginwindow\ LoginHook '" /L*/P*/loginw*' '" L*/P*/*loginit*' 'L*/Ca*/com.ap*.Saf*/E*/* -depth 1 -name In*t -exec '"${c1[14]}"' :CFBundleDisplayName" {} \;' '~ $TMPDIR.. \( -flags +sappnd,schg,uappnd,uchg -o ! -user $UID -o ! -perm -600 $' '.??* -path .Trash -prune -o -type d -name *.app -print -prune' :${p[35]}\" :Label\" '{/,}L*/{Con,Pref}* -type f ! -size 0 -name *.plist -exec plutil -s {} \;' "-f'%N: %l' Desktop L*/Keyc*" therm sysload boot-args status " -F '\$Time \$Message' -k Sender kernel -k Message Req 'bad |Beac|caug|dead[^bl]|FAIL|fail|GPU |hfs: Ru|inval|jnl:|last value [1-9]|n Cause: -|NVDA$|pagin|proc: t|Roamed|rror|ssert|Thrott|tim(ed? ?|ing )o|WARN' -k Message Rne 'Goog|ksadm|SMC:' -o -k Sender fseventsd -k Message Req 'SL' " '-du -n DEV -n EDEV 1 10' 'acrx -o comm,ruid,%cpu' '-t1 10 1' '-f -pfc /var/db/r*/com.apple.*.{BS,Bas,Es,J,OSXU,Rem,up}*.bom' '{/,}L*/Lo*/Diag* -type f -regex .\*[cgh] ! -name *ag \( -exec grep -lq "^Thread c" {} \; -exec printf \* \; -o -true $ -execdir stat -f:%Sc:%N -t%F {} \;|sort -t: -k2 |tail -n'${p[38]} '-L {/{S*/,},}L*/Lau* -type f' '-L /{S*/,}L*/StartupItems -type f -exec file {} +' '-L /S*/L*/{C*/Sec*A,E}* {/,}L*/{A*d,Ca*/*/Ex,Compon,Ex,In,iTu,Keyb,Mail/B,P*P,Qu*T,Scripti,Sec,Servi,Spo,Widg}* -type f -name Info.plist' '/usr/lib -type f -name *.dylib' `awk "${s[31]}"<<<${p[23]}` "/e*/{auto,{cron,fs}tab,hosts,{[lp],sy}*.conf,pam.d/*,ssh{,d}_config,*.local} {,/usr/local}/etc/periodic/*/* /L*/P*{,/*}/com.a*.{Bo,sec*.ap}*t /S*/L*/Lau*/*t .launchd.conf" list getenv /Library/Preferences/com.apple.alf\ globalstate --proxy '-n get default' -I --dns -getdnsservers\ "${p[N5]}" -getinfo\ "${p[N5]}" -P -m\ / '' -n1 '-R -l1 -n1 -o prt -stats command,uid,prt' '--regexp --only-files --files com.apple.pkg.*|sort|uniq' -kl -l -s\ / '-R -l1 -n1 -o mem -stats command,uid,mem' -i4TCP:0-1023 com.apple.dashboard\ layer-gadgets '-d /L*/Mana*/$USER&&echo On' '-app Safari WebKitDNSPrefetchingEnabled' );N1=${#c2[@]};for j in {0..8};do c2[N1+j]=SP${p[j]}DataType;done;N2=${#c2[@]};for j in 0 1;do c2[N2+j]="-n ' syscall::'${p[33+j]}':return { @out[execname,uid]=sum(arg0) } tick-10sec { trunc(@out,1);exit(0);} '";done;l=(Restricted\ files Hidden\ apps 'Elapsed time (s)' POST Battery Safari\ extensions Bad\ plists 'High file counts' User Heat System\ load boot\ args FileVault Diagnostic\ reports Log 'Free space (MiB)' 'Swap (MiB)' Activity 'CPU per process' Login\ hook 'I/O per process' Mach\ ports kexts Daemons Agents launchd Startup\ items Admin\ access Root\ access Bundles dylibs Apps Font\ issues Inserted\ dylibs Firewall Proxies DNS TCP/IP Wi-Fi Profiles Root\ crontab User\ crontab 'Global login items' 'User login items' Spotlight Memory Listeners Widgets Parental\ Controls Prefetching );N3=${#l[@]};for i in 0 1 2;do l[N3+i]=${p[5+i]};done;N4=${#l[@]};for j in 0 1;do l[N4+j]="Current ${p[29+j]}stream data";done;A0() { id -G|grep -qw 80;v[1]=$?;((v[1]==0))&&sudo true;v[2]=$?;v[3]=`date +%s`;clear >&-;date '+Start time: %T %D%n';};for i in 0 1;do eval ' A'$((1+i))'() { v=` eval "${c1[$1]} ${c2[$2]}"|'${c1[30+i]}' "${s[$3]}" `;[[ "$v" ]];};A'$((3+i))'() { v=` while read i;do [[ "$i" ]]&&eval "${c1[$1]} ${c2[$2]}" \"$i\"|'${c1[30+i]}' "${s[$3]}";done<<<"${v[$4]}" `;[[ "$v" ]];};A'$((5+i))'() { v=` while read i;do '${c1[30+i]}' "${s[$1]}" "$i";done<<<"${v[$2]}" `;[[ "$v" ]];};';done;A7(){ v=$((`date +%s`-v[3]));};B2(){ v[$1]="$v";};for i in 0 1;do eval ' B'$i'() { v=;((v['$((i+1))']==0))||{ v=No;false;};};B'$((3+i))'() { v[$2]=`'${c1[30+i]}' "${s[$3]}"<<<"${v[$1]}"`;} ';done;B5(){ v[$1]="${v[$1]}"$'\n'"${v[$2]}";};B6() { v=` paste -d: <(printf "${v[$1]}") <(printf "${v[$2]}")|awk -F: ' {printf("'"${f[$3]}"'",$1,$2)} ' `;};B7(){ v=`grep -Fv "${v[$1]}"<<<"$v"`;};C0(){ [[ "$v" ]]&&echo "$v";};C1() { [[ "$v" ]]&&printf "${f[$1]}" "${l[$2]}" "$v";};C2() { v=`echo $v`;[[ "$v" != 0 ]]&&C1 0 $1;};C3() { v=`sed -E "$s"<<<"$v"`&&C1 1 $1;};for i in 1 2;do for j in 2 3;do eval D$i$j'(){ A'$i' $1 $2 $3; C'$j' $4;};';done;done;{ A0;A2 0 $((N1+1)) 2;C0;A1 0 $N1 1;C0;B0;C2 27;B0&&! B1&&C2 28;D12 15 37 25 8;A1 0 $((N1+2)) 3;C0;D13 0 $((N1+3)) 4 3;D23 0 $((N1+4)) 5 4;for i in 0 1 2;do D13 0 $((N1+5+i)) 6 $((N3+i));done;D13 1 10 7 9;D13 1 11 8 10;D22 2 12 9 11;D12 3 13 10 12;D23 4 19 44 13;D23 5 14 12 14;D22 6 36 13 15;D22 7 37 14 16;D23 8 15 38 17;D22 9 16 16 18;B1&&{ D22 11 17 17 20;for i in 0 1;do D22 28 $((N2+i)) 45 $((N4+i));done;};D22 12 44 54 45;D22 12 39 15 21;A1 13 40 18;B2 4;B3 4 0 19;A3 14 6 32 0;B4 0 5 11;A1 17 41 20;B7 5;C3 22;B4 4 6 21;A3 14 7 32 6;B4 0 7 11;B3 4 0 22;A3 14 6 32 0;B4 0 8 11;B5 7 8;B1&&{ A2 19 26 23;B7 7;C3 23;};A2 18 26 23;B7 7;C3 24;A2 4 20 21;B7 6;B2 9;A4 14 7 52 9;B2 10;B6 9 10 4;C3 25;D13 4 21 24 26;B4 4 12 26;B3 4 13 27;A1 4 22 29;B7 12;B2 14;A4 14 6 52 14;B2 15;B6 14 15 4;B3 0 0 30;C3 29;A1 4 23 27;B7 13;C3 30;D13 24 24 32 31;D13 25 37 32 33;A2 23 18 28;B2 16;A2 16 25 33;B7 16;B3 0 0 34;B2 21;A6 47 21&&C0;B1&&{ D13 21 0 32 19;D13 10 42 32 40;D22 29 35 46 39;};D13 14 1 48 42;D12 34 43 53 44;D22 0 $((N1+8)) 51 32;D13 4 8 41 6;D12 26 28 35 34;D13 27 29 36 35;A2 27 32 39&&{ B2 19;A2 33 33 40;B2 20;B6 19 20 3;};C2 36;D23 33 34 42 37;B1&&D23 35 45 55 46;D23 32 31 43 38;D12 36 47 32 48;D13 20 42 32 41;D13 14 2 48 43;D13 4 5 32 1;D22 4 4 50 0;D13 4 3 32 5;D12 26 48 49 49;B3 4 22 57;A1 26 46 56;B7 22;B3 0 0 58;C3 47;D23 22 9 37 7;A7;C2 2;} 2>/dev/null|pbcopy;exit 2>&-
Copy the selected text to the Clipboard by pressing the key combination command-C.
7. Launch the built-in Terminal application in any of the following ways:
Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Click anywhere in the Terminal window and paste by pressing command-V. The text you pasted should vanish immediately. If it doesn't, press the return key.
8. If you see an error message in the Terminal window such as "Syntax error" or "Event not found," enter
exec bash
and press return. Then paste the script again.
9. If you're logged in as an administrator, you'll be prompted for your login password. Nothing will be displayed when you type it. You will not see the usual dots in place of typed characters. Make sure caps lock is off. Type carefully and then press return. You may get a one-time warning to be careful. If you make three failed attempts to enter the password, the test will run anyway, but it will produce less information. In most cases, the difference is not important. If you don't know the password, or if you prefer not to enter it, press the key combination control-C or just press return three times at the password prompt. Again, the script will still run.
If you're not logged in as an administrator, you won't be prompted for a password. The test will still run. It just won't do anything that requires administrator privileges.
10. The test may take a few minutes to run, depending on how many files you have and the speed of the computer. A computer that's abnormally slow may take longer to run the test. While it's running, there will be nothing in the Terminal window and no indication of progress. Wait for the line
[Process completed]
to appear. If you don't see it within half an hour or so, the test probably won't complete in a reasonable time. In that case, close the Terminal window and report the results. No harm will be done.
11. When the test is complete, quit Terminal. The results will have been copied to the Clipboard automatically. They are not shown in the Terminal window. Please don't copy anything from there. All you have to do is start a reply to this comment and then paste by pressing command-V again.
At the top of the results, there will be a line that begins with the words "Start Time." If you don't see that, but instead see a mass of gibberish, you didn't wait for the "Process completed" message to appear in the Terminal window. Please wait for it and try again.
If any private information, such as your name or email address, appears in the results, anonymize it before posting. Usually that won't be necessary.
12. When you post the results, you might see the message, "You have included content in your post that is not permitted." It means that the forum software has misidentified something in the post as a violation of the rules. If that happens, please post the test results on Pastebin, then post a link here to the page you created.
Note: This is a public forum, and others may give you advice based on the results of the test. They speak only for themselves, and I don't necessarily agree with them.
Copyright © 2014 by Linc Davis. As the sole author of this work, I reserve all rights to it except as provided in the Use Agreement for the Apple Support Communities website ("ASC"). Readers of ASC may copy it for their own personal use. Neither the whole nor any part may be redistributed.

IF Auto Update Statistics ENABLED in Database Design, Why we need to Update Statistics as a maintenance plan

Hi Experts,
IF Auto Update Statistics ENABLED in Database Design, Why we need to Update Statistics as a maintenance plan for Daily/weekly??
Vinai Kumar Gandla

Hi Vikki,
Many systems rely solely on SQL Server to update statistics automatically(AUTO UPDATE STATISTICS enabled), however, based on my research, large tables, tables with uneven data distributions, tables with ever-increasing keys and tables that have significant
changes in distribution often require manual statistics updates as the following explanation.
1.If a table is very big, then waiting for 20% of rows to change before SQL Server automatically updates the statistics could mean that millions of rows are modified, added or removed before it happens. Depending on the workload patterns and the data,
this could mean the optimizer is choosing a substandard execution plans long before SQL Server reaches the threshold where it invalidates statistics for a table and starts to update them automatically. In such cases, you might consider updating statistics
manually for those tables on a defined schedule (while leaving AUTO UPDATE STATISTICS enabled so that SQL Server continues to maintain statistics for other tables).
2.In cases where you know data distribution in a column is "skewed", it may be necessary to update statistics manually with a full sample, or create a set of filtered statistics in order to generate query plans of good quality. Remember,
however, that sampling with FULLSCAN can be costly for larger tables, and must be done so as not to affect production performance.
3.It is quite common to see an ascending key, such as an IDENTITY or date/time data types, used as the leading column in an index. In such cases, the statistic for the key rarely matches the actual data, unless we update the Statistic manually after
every insert.
So in the case above, we could perform manual statistics updates by
creating a maintenance plan that will run the UPDATE STATISTICS command, and update statistics on a regular schedule. For more information about the process, please refer to the article:
https://www.simple-talk.com/sql/performance/managing-sql-server-statistics/
Regards,
Michelle Li

Significant slowness in data transfer from source DB to target DB

Hi DB Wizards,
     My customer is noticing significant slowness in Data copy from the Source DB to the Target DB. The copy process itself is using PL/SQL code along with cursors. The process is to copy across about 7M records from the source DB to the target DB as part of a complicated Data Migration process (this will be a onetime Go-Live process). I have also attached the AWR reports generated during the Data Migration process. Are there any recommendations to help improve the performance of the Data transfer process.
Thanks in advance,
Nitin

multiple COMMIT will take longer to complete the task than a single COMMIT at the end!Lets check how much longer it is:
create table T1 as
select OWNER,TABLE_NAME,COLUMN_NAME,DATA_TYPE,DATA_TYPE_MOD,DATA_TYPE_OWNER,DATA_LENGTH,DATA_PRECISION,DATA_SCALE,NULLABLE,COLUMN_ID,DEFAULT_LENGTH,NUM_DISTINCT,LOW_VALUE,HIGH_VALUE,DENSITY,NUM_NULLS,NUM_BUCKETS,LAST_ANALYZED,SAMPLE_SIZE,CHARACTER_SET_NAME,CHAR_COL_DECL_LENGTH,GLOBAL_STATS,USER_STATS,AVG_COL_LEN,CHAR_LENGTH,CHAR_USED,V80_FMT_IMAGE,DATA_UPGRADED,HISTOGRAM
from DBA_TAB_COLUMNS;
insert /*+APPEND*/ into T1 select *from T1;
commit;
-- repeat untill it is >7Mln rows
select count(*) from T1;
9233824
create table T2 as select * from T1;
set autotrace on timing on;
truncate table t2;
declare r number:=0;
begin
for t in (select * from t1) loop
insert into t2 values ( t.OWNER,t.TABLE_NAME,t.COLUMN_NAME,t.DATA_TYPE,t.DATA_TYPE_MOD,t.DATA_TYPE_OWNER,t.DATA_LENGTH,t.DATA_PRECISION,t.DATA_SCALE,t.NULLABLE,t.COLUMN_ID,t.DEFAULT_LENGTH,t.NUM_DISTINCT,t.LOW_VALUE,t.HIGH_VALUE,t.DENSITY,t.NUM_NULLS,t.NUM_BUCKETS,t.LAST_ANALYZED,t.SAMPLE_SIZE,t.CHARACTER_SET_NAME,t.CHAR_COL_DECL_LENGTH,t.GLOBAL_STATS,t.USER_STATS,t.AVG_COL_LEN,t.CHAR_LENGTH,t.CHAR_USED,t.V80_FMT_IMAGE,t.DATA_UPGRADED,t.HISTOGRAM
r:=r+1;
if mod(r,10000)=0 then commit; end if;
end loop;
commit;
end;
--call that couple of times with and without "if mod(r,10000)=0 then commit; end if;" commented.
Results:
One commit
anonymous block completed
Elapsed: 00:11:07.683
Statistics
18474603 recursive calls
0 spare statistic 4
0 ges messages sent
0 db block gets direct
0 calls to kcmgrs
0 PX remote messages recv'd
0 buffer is pinned count
1737 buffer is not pinned count
2 workarea executions - optimal
0 workarea executions - onepass
10000 rows commit
anonymous block completed
Elapsed: 00:10:54.789
Statistics
18475806 recursive calls
0 spare statistic 4
0 ges messages sent
0 db block gets direct
0 calls to kcmgrs
0 PX remote messages recv'd
0 buffer is pinned count
1033 buffer is not pinned count
2 workarea executions - optimal
0 workarea executions - onepass
one commit
anonymous block completed
Elapsed: 00:10:39.139
Statistics
18474228 recursive calls
0 spare statistic 4
0 ges messages sent
0 db block gets direct
0 calls to kcmgrs
0 PX remote messages recv'd
0 buffer is pinned count
1123 buffer is not pinned count
2 workarea executions - optimal
0 workarea executions - onepass
10000 rows commit
anonymous block completed
Elapsed: 00:11:46.259
Statistics
18475707 recursive calls
0 spare statistic 4
0 ges messages sent
0 db block gets direct
0 calls to kcmgrs
0 PX remote messages recv'd
0 buffer is pinned count
1000 buffer is not pinned count
2 workarea executions - optimal
0 workarea executions - onepass
What we've got?
Single commit at the end, avg elapsed: 10:53.4s
Commit every 10000 rows (923 times), avg elapsed: 11:20.5s
Difference:     00:27.1s     3.98%
Multiple commits is just 4% slower. But it is safer regarding Undo consumed.

Error during sap r/3 installation at update databse statistics

Hi friends,
I am getting an error during sap r/3 installation almost at the last stage.
the error is at update database statistics.
my configuration is
os: windows 2000 server.
d/b: oracle 9i.
erp: sap 4.7 ee
During oracle installation stage the oui is asking for create a database, i am chechking it ok. Is that a problem ?.
I am sending the log file. Please can anybody help me, where i am going wrong-
The log file----
Click Browse and give location of export1, as shown in the bellow figure
INFO 2007-02-04 21:46:32
Creating directory D:\oracle\DRS\sapdata4\drs620_5.
INFO 2007-02-04 21:46:32
Creating file system node D:\oracle\DRS/sapdata4\drs620_5 with type DIRECTORY succeeded.
INFO 2007-02-04 21:46:32
Creating directory D:\oracle\DRS\sapdata5\drs620_6.
INFO 2007-02-04 21:46:32
Creating file system node D:\oracle\DRS/sapdata5\drs620_6 with type DIRECTORY succeeded.
INFO 2007-02-04 21:46:32
Creating directory D:\oracle\DRS\sapdata5\drs620_7.
INFO 2007-02-04 21:46:32
Creating file system node D:\oracle\DRS/sapdata5\drs620_7 with type DIRECTORY succeeded.
INFO 2007-02-04 21:46:32
Creating directory D:\oracle\DRS\sapdata6\drs620_8.
INFO 2007-02-04 21:46:32
Creating file system node D:\oracle\DRS/sapdata6\drs620_8 with type DIRECTORY succeeded.
INFO 2007-02-04 21:46:32
Creating directory D:\oracle\DRS\sapdata6\drs620_9.
INFO 2007-02-04 21:46:32
Creating file system node D:\oracle\DRS/sapdata6\drs620_9 with type DIRECTORY succeeded.
INFO 2007-02-04 21:46:32
Creating directory D:\oracle\DRS\sapdata6\drsusr_1.
INFO 2007-02-04 21:46:32
Creating file system node D:\oracle\DRS/sapdata6\drsusr_1 with type DIRECTORY succeeded.
INFO 2007-02-04 21:46:32
Creating directory D:\oracle\DRS\sapdata2\roll_1.
INFO 2007-02-04 21:46:32
Creating file system node D:\oracle\DRS/sapdata2\roll_1 with type DIRECTORY succeeded.
INFO 2007-02-04 21:46:32
Creating directory D:\oracle\DRS\sapdata3\temp_1.
INFO 2007-02-04 21:46:32
Creating file system node D:\oracle\DRS/sapdata3\temp_1 with type DIRECTORY succeeded.
INFO 2007-02-04 21:46:32
Creating directory D:\oracle\DRS\sapdata1\system_1.
INFO 2007-02-04 21:46:32
Creating file system node D:\oracle\DRS/sapdata1\system_1 with type DIRECTORY succeeded.
INFO 2007-02-04 21:46:32
Processing of all file system node operations of table tORA_SapdataNodes succeeded.
INFO 2007-02-04 21:46:33
Processing of all file system node operations of table tORA_DatabaseServerNodes succeeded.
INFO 2007-02-04 21:46:34
Processing of all file system node operations of table tORA_SapdataNodes succeeded.
INFO 2007-02-04 21:46:35
Creating file c:\oracle\ora90\database\initDRS.ora.
INFO 2007-02-04 21:46:36
Creating file C:\oracle\ora90\database\initDRS.sap.
INFO 2007-02-04 21:46:37
Copying file F:/sap4.7/ker/NT/COMMON/INSTALL/INITSID.DBA to: c:\oracle\ora90/database/initDRS.dba.
INFO 2007-02-04 21:46:37
Creating file c:\oracle\ora90\database\initDRS.dba.
INFO 2007-02-04 21:46:38
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 21:46:39
Moving file c:/oracle/ora90/database/initDRS.ora to: orig_init_ora_tmp.txt.
INFO 2007-02-04 21:46:39
Moving file C:/SAPinst ORACLE KERNEL/changed_init_ora_tmp.txt to: c:\oracle\ora90\database\initDRS.ora.
INFO 2007-02-04 21:46:39
Removing file C:/SAPinst ORACLE KERNEL/orig_init_ora_tmp.txt.
INFO 2007-02-04 21:46:40
Creating file C:\SAPinst ORACLE KERNEL\oradim.log.
INFO 2007-02-04 21:46:45
See 'c:\oracle\ora90/bin/oradim -new -sid DRS -STARTMODE auto' output in 'C:\SAPinst ORACLE KERNEL\oradim.log'.
INFO 2007-02-04 21:46:45
'c:\oracle\ora90/bin/oradim -new -sid DRS -STARTMODE auto' returned with '0'.
INFO 2007-02-04 21:46:46
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 21:46:49
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 21:59:57
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:00:00
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:00:44
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:00:46
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:01:31
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:01:34
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:02:18
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:02:20
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:03:06
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:03:09
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:03:55
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:03:57
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:04:44
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:04:46
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:05:32
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:05:35
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:06:21
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:06:23
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:07:10
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:07:12
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:07:58
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:08:01
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:08:48
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:08:50
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:09:38
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:09:40
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:09:44
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:09:46
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:10:06
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:10:09
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:10:39
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:10:41
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:10:44
Moving file c:/oracle/ora90/database/initDRS.ora to: orig_init_ora_tmp.txt.
INFO 2007-02-04 22:10:44
Moving file C:/SAPinst ORACLE KERNEL/changed_init_ora_tmp.txt to: c:\oracle\ora90\database\initDRS.ora.
INFO 2007-02-04 22:10:44
Removing file C:/SAPinst ORACLE KERNEL/orig_init_ora_tmp.txt.
INFO 2007-02-04 22:10:45
Creating file C:\SAPinst ORACLE KERNEL\lsnrctl.log.
INFO 2007-02-04 22:10:46
See 'c:\oracle\ora90/bin/lsnrctl stat' output in 'C:\SAPinst ORACLE KERNEL\lsnrctl.log'.
INFO 2007-02-04 22:10:46
'c:\oracle\ora90/bin/lsnrctl stat' returned with '3'.
INFO 2007-02-04 22:10:46
Creating file C:\SAPinst ORACLE KERNEL\lsnrctl.log.
INFO 2007-02-04 22:10:48
See 'c:\oracle\ora90/bin/lsnrctl start' output in 'C:\SAPinst ORACLE KERNEL\lsnrctl.log'.
INFO 2007-02-04 22:10:48
'c:\oracle\ora90/bin/lsnrctl start' returned with '0'.
INFO 2007-02-04 22:10:48
Copying file F:/sap4.7/ker/NT/COMMON/INSTALL/ORADBUSR.SQL to: ./oradbusr.sql.
INFO 2007-02-04 22:10:48
Creating file C:\SAPinst ORACLE KERNEL\oradbusr.sql.
INFO 2007-02-04 22:10:49
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:10:52
Changed working directory to C:\SAPinst ORACLE KERNEL.
PHASE 2007-02-04 22:10:54
Database Load
INFO 2007-02-04 22:10:58
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:10:59
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:11:00
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:11:01
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:11:01
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:11:01
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:11:01
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:11:01
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:11:01
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:11:01
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:11:01
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:11:01
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:11:01
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:11:01
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:11:01
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:11:02
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:11:02
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:11:02
Task files created
INFO 2007-02-04 22:11:03
Command files created
INFO 2007-02-04 22:11:05
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:11:05
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-04 22:11:05
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-05 00:06:44
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-05 03:43:19
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-05 04:55:23
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-05 05:17:24
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-05 05:39:25
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-05 05:45:25
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-05 05:57:26
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-05 06:00:26
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-05 06:03:26
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-05 06:05:26
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-05 06:07:26
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-05 06:08:27
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-05 06:09:28
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-05 06:24:46
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-05 06:24:46
Processes finished successfully
INFO 2007-02-05 06:26:23
Creating file C:\SAPinst ORACLE KERNEL\ddicora.sql.
INFO 2007-02-05 06:26:25
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-05 06:26:30
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-05 06:26:32
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-05 06:26:43
Moving file c:/oracle/ora90/database/initDRS.ora to: orig_init_ora_tmp.txt.
INFO 2007-02-05 06:26:43
Moving file C:/SAPinst ORACLE KERNEL/changed_init_ora_tmp.txt to: c:\oracle\ora90\database\initDRS.ora.
INFO 2007-02-05 06:26:43
Removing file C:/SAPinst ORACLE KERNEL/orig_init_ora_tmp.txt.
INFO 2007-02-05 06:26:43
Moving file c:/oracle/ora90/database/initDRS.ora to: orig_init_ora_tmp.txt.
INFO 2007-02-05 06:26:43
Moving file C:/SAPinst ORACLE KERNEL/changed_init_ora_tmp.txt to: c:\oracle\ora90\database\initDRS.ora.
INFO 2007-02-05 06:26:43
Removing file C:/SAPinst ORACLE KERNEL/orig_init_ora_tmp.txt.
INFO 2007-02-05 06:26:43
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-05 06:26:45
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-05 06:26:48
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-05 06:26:52
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-05 06:26:55
Creating file C:\SAPinst ORACLE KERNEL\brconnect.log.
INFO 2007-02-05 06:26:55
Changed working directory to C:\SAPinst ORACLE KERNEL.
INFO 2007-02-05 06:26:55
See 'D:\usr\sap\DRS\SYS\exe\run/brconnect -c -f crsyn -o SAPDRS' output in 'C:\SAPinst ORACLE KERNEL\brconnect.log'.
ERROR 2007-02-05 06:26:55
MOS-01012 PROBLEM: 'D:\usr\sap\DRS\SYS\exe\run/brconnect -c -f crsyn -o SAPDRS' returned with '128' which is not a defined as a success code.
ERROR 2007-02-05 06:26:55
FJS-00012 Error when executing script.
kindly help me where i am going wrong.
Yours friendly,
Bharath.

Hi Andreas,
many thanks to you for the timely help.
a.)I want to know why there is an error at brconnect ? why is it returning an error code (128) at UPDATE DATABASE STATISTICS stage.
I have read in this forum itself that the UPDATE STATISTICS need not be suceesfully completed and we can edit database.r3s
" ..on the other hand you can easily invoke the update statistics after the installation has ended (succesfully!)...edit DATABASE.R3S (or the appropriate template file you are using) by changing the status=ERROR to status=OK...this will let you finish the installation..-GreetZ, AH."
I have searched for this file (database.r3s) in my system in vain Where can i find this file database.r3s?.
Have i done any configuration mistake at the pre-installation stage. I have installed Oracle 9.0 using setup.exe of oracle. should i use sapserver.cmd to install oracle?.I havent applied any patch for Oracle 9.0
Should I apply any patch just the same way we do for Oracle 8.1.x ?. If so, where can i get the patch for Oracle 9.0 .?.
b.) You said there should not be any spaces in file path (ex: C:/SAPinst ORACLE KERNEL/) . But I havent specified file path, the r/3 setup itself has created the directory path.
c.) I want to know one thing- should we create a database before installing r/3. When we are installing Oracle 8/9. x what are the components that we are installing?
Your friend,
Bharath.

MBRC and SYSTEM STATISTICS in Oracle 10g database.

Hi All,
I am performing database upgrade from Oracle 8i Solaris to Oracle 10g HP-UX using exp/imp method.
But i do have some doubts regarding MBRC and System statistics.
MBRC in Oracle 10g is automatically adjusted if MBRC parameter is not set, but i found value 128 as shown below.
SQL> select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
PL/SQL Release 10.2.0.4.0 - Production
CORE    10.2.0.4.0      Production
TNS for HPUX: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production
SQL> sho parameter multi
NAME                                 TYPE                             VALUE
db_file_multiblock_read_count        integer                          128Also i performed one simple full table scan to test it...but db file scattered read is performing on 128 blocks. So i dont think 128 is suitable and is automatic, i mean MBRC is not set accrodingly it always uses 128.
Does this MBRC value affects whole database performance?
Regarding SYSTEM STATISTICS i found below result:
SQL> select * from AUX_STATS$
SNAME                          PNAME                               PVAL1 PVAL2
SYSSTATS_INFO                  STATUS                                    COMPLETED
SYSSTATS_INFO                  DSTART                                    11-09-2009 04:59
SYSSTATS_INFO                  DSTOP                                     11-09-2009 04:59
SYSSTATS_INFO                  FLAGS                                   1
SYSSTATS_MAIN                  CPUSPEEDNW                     128.239557
SYSSTATS_MAIN                  IOSEEKTIM                              10
SYSSTATS_MAIN                  IOTFRSPEED                           4096
SYSSTATS_MAIN                  SREADTIM
SYSSTATS_MAIN                  MREADTIM
SYSSTATS_MAIN                  CPUSPEED
SYSSTATS_MAIN                  MBRC
SYSSTATS_MAIN                  MAXTHR
SYSSTATS_MAIN                  SLAVETHRNow whether NOWORKLOAD or WORKLOAD is better, and this server is still under building process....so how can i collect WORKLOAD stats as high load on this server can't be performed?? Is it really require to gather system statistics, what will happen with NOWORLOAD stats?
I have not seen single database where system stats are gathered in our organisation having more than 2000 databases.
-Yasser

Maybe this article written by Tom Kite helps:
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:499197100346264909

Significance of 'migr' statistics shown in mpstat

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