RE: Hotsos' Classes

2004-01-07 Thread Gudmundur Bjarni Josepsson
Venu,

I've taken both PD101 and OP101 and I can thoroughly recommend both of
them.  The sequence of those two is irrelevant in my opinion.

If you're looking to improve your tuning skills and your understanding
of Oracle performance issues I would suggest the OP101.  It has a very
good balance of lectures and hands-on, brain-heating exercises.  You
will probably scratch your head when it comes to the exercises but they
really drive home what the lecturer has been talking about.  The
exercises take at least 50% of the time but of course I don't know of
the course will develop since the first beta class.

(The correct URL for the OP101 is
http://www.hotsos.com/courses/OP101.php).

Gudmundur

> -Original Message-
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On 
> Behalf Of Potluri, Venu (CT Appl Suppt)
> Sent: 6. janúar 2004 19:24
> To: Multiple recipients of list ORACLE-L
> Subject: Hotsos' Classes
> 
> 
> Is there a proper sequence of classes to take, among those 
> offered by Hotsos? While I do use Wait events to monitor & 
> "tune"  my Oracle Financials databases, I need more training 
> in Performance tuning. I am just dipping my toes into the 
> world of Oracle Performance Tuning. I am reading Cary's book 
> and I have used Ixora's treasure of information, quite a bit 
> in the past. 
> 
> I see there are a number of classes now as opposed to a 
> clinic in the past.
> 
> Performance Diagnosis 101
> SQL Optimization 101
> Hotsos Symposium 2004
> Steve Adams Seminar
> 
> While I would love to take all of them, time & work schedule 
> permitting, I wouldn't want to waste time either if any of 
> the subject matter goes above my head and I spend time 
> scratching my head. God knows I might even find SQL Tuning 
> class useful to brush up little that I know. Would the Hotsos 
> Symposium be not suitable for poeple like myself who haven't 
> taken the Performance Diagnostics 101 class and aren't well 
> versed with Performance Tuning? What is expected of the 
> audience in terms of prior knowledge? Mind you, I am not an 
> expert like most of you guys. Haven't written a book or even a paper!
> 
> Venu Potluri
> Oracle Financials DBA
> 
> 
> 
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> Author: Potluri, Venu (CT Appl Suppt)
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RE: Plan stability

2003-12-02 Thread Gudmundur Bjarni Josepsson
rom).  You 
> may also send 
> >> the HELP command for other information (like subscribing).
> >> 
> > 
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RE: Plan stability

2003-12-02 Thread Gudmundur Bjarni Josepsson
What is complicated about stored outlines?  If you don't like those you
can always go back to the RBO.

Gudmundur

> -Original Message-
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On 
> Behalf Of Wartiak Rastislav
> Sent: 2. desember 2003 08:44
> To: Multiple recipients of list ORACLE-L
> Subject: Plan stability
> 
> 
> Hi,
> 
> my question is about the same, but more general. How can i 
> force Oracle to use my prefered way of explain plan and not 
> use CBO's. I mean, apart from stored outlines, it somehow 
> seems to complicated. I would like to say what order and join 
> types it should use. But, try as I might, I many times cannot 
> force Oracle to use my way, even though I know it is 
> possible, for I saw this kind of explain plan for that 
> specific query..
> 
> I tried to use hints like ordered and use_hj etc. Can someone 
> give some examples of full set of hints for some simple queries?
> 
> Thx,
> rw
> 
> > Hi, list friends:
> > We are using partition to archive history data in our 
> production 
> > OLTP database. We get great performance gains(Far less disk 
> io), but 
> > we also hit performance trouble sometimes. So I am here ask 
> for your 
> > experience.
> > 
> > We used local index on all partitioned tables.We add/drop 
> > partition monthly to archive the history data.
> > 
> > But the trouble is, when add/drop partition is being 
> done on the 
> > partitioned table, CBO sometimes changed SQL execution path.We 
> > implemented partition 2 monthes ago, and in the first time, 
> add/drop 
> > partition went on quite smoothly, but in the second time we 
> add/drop 
> > partition, two SQL (just TWO SQL) get bad execution path and server 
> > load rushed to 10 times(from 2 to 20 in uptime), all 
> waiting for latch 
> > free event. It severely affected our application. We are an online 
> > system and we do not have scheduled time every month so we have to
> > add/drop partition while db is still running.
> > 
> > So, with system still up and running, how do you add/drop 
> > partition without changing the SQL execution path? We do 
> not have the 
> > time to reanalyze/dbms_stats the tables ,analyze takes hours and if 
> > SQL execution path changed, during these time, system is nearly 
> > unusable.
> > 
> > I tried to import old 
> statistics(dbms_stats.import_table_stats), 
> > but did not fix the problem.
> > So, can you share your experience on managing partitioned table?
> > 
> > Regards
> > 
> > Zhu Chao
> > www.cnoug.org
> > 
> > 
> > 
> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.net
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RE: Database just stops

2003-10-14 Thread Gudmundur Bjarni Josepsson
Title: Message



This 
probably sounds like Oracle Support but I'd start by patching to 
8.1.7.4.1.
 
Regards,
Gudmundur

  
  -Original Message-From: 
  [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of 
  Smith, Ron L.Sent: 14. október 2003 20:14To: 
  Multiple recipients of list ORACLE-LSubject: Database just 
  stops
  I 
  have an Oracle 8.1.7.0 database running on an MS2000 server.  A few times 
  a day the database just stops running for no reason.
  There are no messages in the alert or trace logs.  Nothing in the 
  Event logs.  It just stops.
   
  When 
  I restart the database it goes through crash recovery but comes up 
  fine.
   
  Anyone have any ideas?
   
  Thanks!
  Ron 
  Smith


RE: Upgrade from 8.1.7.3 to 8.1.7.4

2003-09-25 Thread Gudmundur Bjarni Josepsson
Patchset 2376472 

Regards,
Gudmundur

> -Original Message-
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On 
> Behalf Of Oracle DBA
> Sent: 25. september 2003 21:00
> To: Multiple recipients of list ORACLE-L
> Subject: Upgrade from 8.1.7.3 to 8.1.7.4
> 
> 
> Hi List,
> 
> We have 8.1.7.3 database and neede to upgrade to
> 8.1.7.4
> 
> I couldn't find out the patch to upgrade from 8.1.7.3
> to 8.1.7.4? Any help would be really appreciated.
> 
> TIA
> 
> Thanks
> Sami
> 
> 
> __
> Do you Yahoo!?
> The New Yahoo! Shopping - with improved product search 
http://shopping.yahoo.com
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RE: any else try trace analyzer?

2003-09-25 Thread Gudmundur Bjarni Josepsson
It's an improvement over tkprof but still I think it doesn't come close
to the Hotsos Profiler.

Gudmundur

> Looks to be pretty new. I think it came from the Apps team. 
> Its not even in Kytes new book. 
> 
> you can get it off of metalink. It gives you alot more info 
> than tkprof when teamed with a 10046 trace.
> 
> any articles on this yet? There is some data in it, I cant 
> quite follow? 
> 
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RE: Is Cary's new book shipping now?

2003-09-17 Thread Gudmundur Bjarni Josepsson
So have I and to me it sounded pretty much like "The hills are alive
with the sound of music" which is pretty much what I imagine Cary likes
to sing.

Gudmundur

> -Original Message-
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On 
> Behalf Of Mogens Nørgaard
> Sent: 17. september 2003 08:50
> To: Multiple recipients of list ORACLE-L
> Subject: Re: Is Cary's new book shipping now?
> 
> 
> Lies, all lies. I've heard myself snoring.
> 
> Pete Sharman wrote:
> 
> >I can guarantee that won't happen, since Cary's singing is 
> pretty much akin
> >to Mogens's snoring!   :)
> >
> >Pete
> >"Controlling developers is like herding cats."
> >Kevin Loney, Oracle DBA Handbook
> >"Oh no, it's not.  It's much harder than that!"
> >Bruce Pihlamae, long-term Oracle DBA

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RE: Online Document for Windows XP Home edition Severity 3

2003-08-22 Thread Gudmundur Bjarni Josepsson
Title: Message



Try 
copying the contents of the CD to a directory on your hard drive.  Search 
for all instances of symcjit.dll in that directory and below and rename them to 
symcjit.dll.old.  Then run setup from the directory on your hard 
drive.
 
Gudmundur

  
  -Original Message-From: 
  [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of 
  Sinardy XingSent: 21. ágúst 2003 15:01To: Multiple 
  recipients of list ORACLE-LSubject: Online Document for Windows XP 
  Home edition Severity 3
  Hi 
  all,
   
  I have new 
  notebook, I want to install Oracle Doc 8.1.7, but Oracle fail to run when 
  I click Install/Deinstall button
   
  Some said XP home 
  edition cannot install Oracle, is this because Sun demand Ms 
  to remove the JVM? Can someone help me 
  please..
   
  Thanks
   
  Sinardy


RE: cursor_sharing in 8.1.7.4 - good or bad

2003-08-20 Thread Gudmundur Bjarni Josepsson
Title: Message




I know 
of a site that has been using cursor_sharing=force on 8.1.7 for over two years now with no 
noticeable side-effects (except that many of the 
programmers still think it's okay to use literals).
 
Gudmundur
 

   
  Does anyone have 
  any experience using cursor_sharing in 8.1.7.4?    I feel 
  I need to use it due to literal SQL statements being used.  We have had 
  misc 4031 errors off and on and I feel this is my last hope.  I have a 
  very busy OPFS server (HP-UX).  
   
  I did try using 
  cursor_sharing in 8.1.7.2, and I remember incorrect sorting and other 
  unexpected results happening.
   
  Thanks for any 
  input.
   
   
  John
   
   
  John Fedock "K" Line America, 
  Inc. www.kline.com  * [EMAIL PROTECTED] 
   


RE: 9i-OCP Question

2003-08-14 Thread Gudmundur Bjarni Josepsson
Title: Message



The silliest questions I remember seeing in an OCP exam 
were the questions in the Oracle8 Networking exam which asked about the sequence 
of dialog boxes in the Network Configuration 
Assistant!

  I took the 8i OCP upgrade exam this weekend. I was amazed at one 
  question.  It was asking about the OUI and installing third party 
  software.  Now I've been an Oracle DBA for many years, and I would have 
  thought Oracle would be more concerned about the Oracle database and the way 
  it works rather then third party software, but apparently that is an important 
  enough piece of information to Oracle Education to make it into a 45 question 
  exam.


RE: 9i then 8i Installs

2003-08-04 Thread Gudmundur Bjarni Josepsson
FWIW, I installed 9.2.0 then 8.1.7 and then 8.0.5 on Windows without a
problem.

Gudmundur

> I got an odd request today to install 8.1.7 on an existing 
> server which is running 9.2 (Windows 2000). Has anyone 
> successfully been able to install Oracle 8.1.7 on the same 
> Windows Server that already has 9.2 running? I know that if 
> you install 8.1.7 then 9.2 both in different homes it will 
> work, but I have never seen it work where 9.2 was installed 
> first. I have not been able to locate a test box yet and was 
> wondering if it is possible and if so if there are any 
> pitfalls I should watchout for, other then the standard 
> Windows stuff
> 
> Thanks In advance,
> Jay
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RE: Oracle to MSSQL conversion?

2003-08-01 Thread Gudmundur Bjarni Josepsson
Yep, and they use the same definition of an hour as Oracle did with the
Oracle Applications One-Hour Install :)


> Hmm, must be a one hour course then ;-)
> 
> On Thursday 31 July 2003 12:34, you wrote:
> > I know Microsoft is offering a new course called 'Microsoft 
> SQL Server 
> > 2000 for Experienced Database Professionals'.  It is aimed at DBAs 
> > with experience with Oracle, DB2, Sybase etc. who want to know more 
> > about SQL Server.
> >
> > You can read more about this course at 
> > http://www.microsoft.com/traincert/syllabi/2723afinal.asp.
> >
> > Gudmundur

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RE: Oracle to MSSQL conversion?

2003-07-31 Thread Gudmundur Bjarni Josepsson
I know Microsoft is offering a new course called 'Microsoft SQL Server
2000 for Experienced Database Professionals'.  It is aimed at DBAs with
experience with Oracle, DB2, Sybase etc. who want to know more about SQL
Server.

You can read more about this course at
http://www.microsoft.com/traincert/syllabi/2723afinal.asp.

Gudmundur

> Hello,
> 
> There is alot of talk about multi-skilling/reskilling going 
> on here at my company. We use Oracle and MSSQL dbs. 
> I have been wondering if anyone is aware of a resource that 
> shows the oracle programming technique and what the 
> corresponding MSSQL programming technique is. ie
> Oracle defines variable   : MSSQL defines variable
> Oracle cursor looks like this   : MSSQL cursor looks like this.
> Oracle uses rollbacks: MSSQL uses "MSSQL rollbacks"
> etc
> Hope you all understand what I mean.
> 
> TIA
> Denham Eva
> Oracle DBA
> Linux like TeePee... No Windows, No Gates and Apache inside!
> 
> 
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RE: Any German here ? Character set

2003-07-30 Thread Gudmundur Bjarni Josepsson


> -Original Message-
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On 
> Behalf Of Tanel Poder
> Sent: 30. júlí 2003 18:05
> To: Multiple recipients of list ORACLE-L
> Subject: Re: Any German here ? Character set
> 
> 
> Any German here ? Character set> I'd recommend WE8ISO8859P15 
> (I think that's
> it) ... the difference is Euro support!
> 
> Yeah, and it has the Õ letter, which I believe is only used 
> by Estonians ;)
> 
> Tanel.
> 
> 
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RE: 9i-OCP Question

2003-07-30 Thread Gudmundur Bjarni Josepsson
Roy,

I think you've got this backwards.  To preserve the groups you need to
preserve the members and thus you would multiplex the members.  

If you multiplex the 4 members of the 2 groups over 4 disks you will
minimize the risk of failure.  If you lose one disk you still have three
members left in each group so you can have up to 3 disks fail without
the instance stopping.

With 2 groups, if you put all the members of a group on a single disk
and you lose that disk you have lost the whole group and the instance
will fail instantly or at the next log switch (depending on whether it
was the current group or not).

Gudmundur

> I thought you need to preserve the groups, not (necessarily) 
> the members.
> 
> If you have each group on its own disk then if one disk goes, 
> you've got a complete set of logs on the other.  Or am I not 
> thinking about this correctly?
> 
> Cheers,
> 
> -Roy
> 
> Roy Pardee
> Programmer/Analyst/DBA
> SWFPAC Lockheed Martin IT
> Extension 8487
> 
> -Original Message-
> Sent: Wednesday, July 30, 2003 11:10 AM
> To: Multiple recipients of list ORACLE-L
> 
> 
> Answe is 4 disks . to keep each member on different disks . 
> 
> -ak
> 
> 
> 
> - Original Message - 
> To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]>
> Sent: Wednesday, July 30, 2003 10:19 AM
> 
> 
> > Hi all,
> > 
> > What is the correct answer for this?
> > 
> > Q> If you have 2 redo log groups with 4 members each, how 
> many disks 
> > Q> does
> > Oracle recommend
> >to keep the redo log files?
> > 
> > 1. 8
> > 2. 2
> > 3. 1
> > 4. 4
> > 
> > Which is the correct answer.
> > 
> > TIA
> > Senthil
> > 
> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.net
> > -- 
> > Author: Senthil Kumar
> >   INET: [EMAIL PROTECTED]
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RE: 8.1.7 instance on Solaris periodically goes sluggish, then hangs...

2003-07-28 Thread Gudmundur Bjarni Josepsson
Paul,

Make sure you're on the lastest 8.1.7.4 patch level.

Learn about 10046 extended SQL tracing.  Then, arrange for one or two of
those users who have been complaining to call you as soon as they notice
something fishy and turn on the tracing.  This will show you in more
detail than you might care about what is causing the wait.

TOAD and Spotlight are useless in these circumstances.

Gudmundur

> -Original Message-
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On 
> Behalf Of Paul Vincent
> Sent: 28. júlí 2003 13:40
> To: Multiple recipients of list ORACLE-L
> Subject: 8.1.7 instance on Solaris periodically goes 
> sluggish, then hangs...
> 
> 
> Hi,
> 
> rather vague, this one, I'm afraid, but we're stumped for ideas.
> 
> We have an Oracle 8.1.7 instance on a Sun Solaris setup, 
> which we're currently testing prior to going live. Every so 
> often - 2 or 3 times a week - the users phone to say the 
> application has stopped responding. They're waiting several 
> minutes with no response. We find we can usually fire up one 
> or two tuning apps, such as TOAD or Quest's Spotlight, but 
> within a few minutes, these also stop responding. By this 
> time, even trying to fire up a SQL*Plus session from my PC 
> just hangs and hangs, without the login ever completing. We 
> always end up having to get the sysadmin to abort-shutdown 
> Oracle and then restart it. After which everything's fine - 
> until the next time.
> 
> I've checked the PROCESSES parameter, and this is set to 150 
> - way above the maximum number of connections we've seen 
> (around 40 or so). Likewise SESSIONS and TRANSACTIONS 
> parameters seem generously adequate. The sysadmin says the 
> server itself doesn't seem to be having any problems. He can 
> log in and run UNIX commands with no apparent performance problems.
> 
> Any ideas at all would be very welcome!
> 
> Paul Vincent
> Oracle DBA
> University of Central England
> -- 
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> -- 
> Author: Paul Vincent
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RE: Timestamps in trace files

2003-07-22 Thread Gudmundur Bjarni Josepsson
Daniel,

Perhaps someone else can explain this better but the documentation I've
got on this says that the Oracle kernel emits timestamps when a long
time has elapsed since the last line was emitted to the trace file.
Long time is defined as tens of seconds.

Gudmundur

> -Original Message-
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
> Behalf Of Daniel Fink
> Sent: 22. júlí 2003 21:19
> To: Multiple recipients of list ORACLE-L
> Subject: Timestamps in trace files
> 
> 
> I was perusing a 10046 trace file and I noticed that
> timestamps are written to the trace file. Sometimes they were 
> very regular (3 minutes apart give or take 30 seconds) while 
> other times they were hours apart. I have noticed that two 
> timestamps are never written without any intervening 
> activity. Anyone have any idea on the reasoning behind the 
> timestamps and the 'triggering event'?
> 
> Daniel
> 

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RE: SHOW ERRORS not working

2003-07-21 Thread Gudmundur Bjarni Josepsson
Have you tried 'show errors procedure blabla'?

Gudmundur

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Re: tuning : file number translation table

2003-07-18 Thread Gudmundur Bjarni Josepsson
This may sound like one of those scratched old 12" LPs, but have you done your 10046 
trace on the sessions that take a long time?

Gudmundur

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Re: enterprise manager

2003-07-16 Thread Gudmundur Bjarni Josepsson
Check (in Control Panel) if your OMS service is running.

Gudmundur

> hi
> i run ora8 on w2000 server.
> my problem is i can ping my database mydb without problems
> i can login with sqlplus as sys and it works fine
> but if i start the enterprise manager console and try to login as sys
> a error occours and means please check the management server status and 
> settings.
> as managementserver i select mydb.
> what ican be the problem?
> thx
> martin


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RE: should you seperate indexes from tables in seperate datafiles?

2003-07-15 Thread Gudmundur Bjarni Josepsson
> It's hot here. I wish I was at the beach and I feel like an ant.

Hmmm.

> During an indexed query on a single table the index will be 
> accessed, then  the table,  then the index,then the table, 
> then the index,then the table then the index,then the table.

Assuming you get 4 rows returned :)

> If the index and the table are on the same disk then a lot of 
> time will be taken up by head seek movement.
> If they are on the different disks then the "index" heads can 
> locate their  data and stay  there - and the "data" heads can 
> locate their data and stay  there. Less head movement, less wasted
time.

I would understand this if I had one index and one table.  On a busy
system with many users wouldn't the heads move, anyway, to serve queries
that used other indexes and tables?

Gudmundur


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RE: Sparky auth file

2003-07-15 Thread Gudmundur Bjarni Josepsson
This was solved offline by examining the setup at one of my customers'
site which has the same configuration of VMS, Oracle and Perl as Barb
listed.

Barb changed the setting of user_dump_dest to point to the actual
directory that was defined in the hotsos.auth file.  For some reason the
logical was not resolved correctly.  I am not proficient enough in VMS
to explain that behaviour further.

To save any future users of Sparky and VMS a few minutes of frustration
I'd like to point out that you must remember to quit your session before
Sparky can pull the trace file over to your PC.  VMS does not release
the file lock on the trace file even if you stop tracing.

Gudmundur

> -Original Message-
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On 
> Behalf Of Barbara Baker
> Sent: 11. júlí 2003 23:35
> To: Multiple recipients of list ORACLE-L
> Subject: Sparky auth file
> 
> 
> Ok, this is a  REAL reach.
> But does anyone out there know how to specify the dump 
> directory in the auth file for sparky
>   ...  wait
>   ...  I'm not there yet
> on an OpenVMS system?
> 
> OpenVMS 7.2-1
> Oracle 8.1.7.4
> Perl 5.6.1
> 
> The background dump desitnation from v$parameter is
> ORA_DUMP.  The system logical ORA_DUMP equates to 
> disk$dbtest11:[db_amdev.trace]. Sparky wants to append the 
> trace name file to the end of this.  I've tried both 
> ORA_DUMP: and disk$dbtest11:[db_amdev.trace] in the aut file. 
> They don't work.
> 
> if I use diskname:
> 
> Authorized directory 'disk$dbtest11:[DB_AMDEV.TRACE]':
> 16 of 16 '*.trc' files are readable
> Fri Jul 11 16:20:48 2003 REQ  10.39.8.253
> version
> Fri Jul 11 16:20:48 2003 ACK  10.39.8.253
> 0 3.04
> Fri Jul 11 16:21:30 2003 REQ  10.39.8.253
> trcname 'ORA_DUMP', '20c02d0a', 'AMDEV', '16'
> Fri Jul 11 16:21:30 2003 ACK  10.39.8.253
> 1 not authorized to
> read 'ORA_DUMP' (trcfiled.pl v3.04 line 536)
> 
> if I use ORA_DUMP
> 
> Fri Jul 11 16:18:34 2003 INFO 
> spid('[.ORA_DUMP]drax11_amdev_fg_oracle_016.trc')='-1'
> Fri Jul 11 16:18:34 2003 WSVR
> can't read '[.ORA_DUMP]drax11_amdev_fg_oracle_017.trc'
> (no such file or directory)
> 
> I get the error message "trace file server daemon has
> denied your request.  Check the trcfiled logfile on
> 'DRAX11' (ip) at port 2297 for details.
> 
> I'd be most grateful for any ideas.
> 
> Thanks!!
> Barb

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Re: any script to parse alert log ?!

2003-07-07 Thread Gudmundur Bjarni Josepsson
> I need a parse alert log and mail me if there is any error.

I know Mogens (pronounced moans) and the guys at Miracle are working on GAPALPART 
(Generic All-Powerful Alert Log Parser And Reporting Tool).  That could be something 
that you could use.  I also know of a tool called MONO which is written in Perl and is 
pretty cool.

Gudmundur


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RE: Oracle DBA 9i Books ever needed.

2003-07-04 Thread Gudmundur Bjarni Josepsson
> in the Hogwarts school of Oracle Wizardry
> Cary Dumbledore is probably the headmaster

Yes, and only because he looks very much like him.

> who will have the role of Lord Voldemort?

There really is only one possible answer to this but I won't say it public :-)

Regards,
Harry

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Re: Raid 0+1 vs. mirrored pairs

2003-07-02 Thread Gudmundur Bjarni Josepsson
Separating tables from indexes is one of those mythical things.
I agree.  It is not given that separating those two will have much impact 
on performance.  However, as you point out yourself it is dependent on the 
amount of IO.  I did say it was nice to be able to separate different 
database objects, not that you should :)

Gudmundur

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Re: Redo Copy Latch contention ??

2003-07-02 Thread Gudmundur Bjarni Josepsson
Question : How can I determine if this redo copy latch is causing the 
performance issues , guess that is my main question before altering some 
hidden parameter in init.ora.
Do a 10046 trace and see if you have any waits on this latch.  I'll run the 
risk of being sued for copyright infringement and say that you can't 
extrapolate detail from an aggregate and aggregates are what you get from 
the V$ views.  Redo copy latch contention might not be a problem for 99% of 
your users but it might be a huge problem for the other 1% of your users.  
However, you have no way of figuring out which users are suffering from 
this by looking at V$ views.  And you can't even tell if redo latch 
contention is a problem even if your ratio is screwed.

I'm willing to bet you my autographed Steve Adams' book that you will not 
fix your redo latch contention by tweaking an init.ora parameter (unless 
it's set _redo_latch_ratio=0).

Gudmundur

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Re: Raid 0+1 vs. mirrored pairs

2003-07-02 Thread Gudmundur Bjarni Josepsson
RAID 0+1 and RAID 1+0 provide similar performance but RAID 1+0 has the 
advantage of offering more redundancy/availability.  If you take your sys 
admin's advice and go with 2 x 3 disks in a 0+1 config and you lose one 
disk then you lose the other two spindles in that stripe as well.  That's 
half of your I/O capacity gone.  With RAID 1+0 the other two spindles will 
still be available when one disk fails in a stripe.

I think it is useful to be able to split your data between different 
physical disks.  Apart from the fact that redo and archive logs should 
never reside on the same volume then it can make a big difference being 
able to keep your data tablespaces from your indexes from your rollback 
from your redo.

And now I have stated the bleeding obvious.  BAARF.

Gudmundur
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RE: Oracle DBA 9i Books ever needed.

2003-07-02 Thread Gudmundur Bjarni Josepsson
> what would happen if Hogwarts taught Oracle Tuning using 
> wands & spells ;) 

Isn't that how Oracle Education does it?  Alomahorabuffercachehitratio!

Gudmundur

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Re: fine grained access

2003-07-02 Thread Gudmundur Bjarni Josepsson
> What our security officer wants is that he can see 
> who changed something in those tables

Sounds more like auditing than FGAC.

Gudmundur


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Re: Automate an update

2003-07-02 Thread Gudmundur Bjarni Josepsson
Joshua,

To update existing rows you could do something like:

update x set window_open = 'Y' 
where to_char (time_field, 'hh24:mi:ss') between '08:00:00' and '16:00:00';

Similar for window_open = 'N'.  Create a trigger to deal with future inserts.

Gudmundur


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Author: Gudmundur Bjarni Josepsson
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Re: 9i OCP Details

2003-06-26 Thread Gudmundur Bjarni Josepsson
> If you want real advanced courses go with [...] what Jonathan Lewis 
> or guys at his level provide.

I have to agree on this.  I've had the good fortune to sit in on Lewis's
'Optimising Oracle' and Cary Millsap's 'Hotsos Clinic 101' and no course
I ever took from Oracle Education comes close to what these guys offer
(and I've taken quite a few).

Gudmundur

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Re: Compare Schema with data

2003-06-17 Thread Gudmundur Bjarni Josepsson
Is any body know any tools for comparing two schema for only data 
comparison & create script for the result
Isn't Change Mangement Pack in OEM able to do this?

Gudmundur
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Re: Query Tuning Question

2003-06-12 Thread Gudmundur Bjarni Josepsson
What could be the cause of this wait?
At the risk of asking the bleeding obvious, have you tried doing a 10046 
trace on the query?

Gudmundur

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Re: Information out of the Explain Plan?

2003-06-09 Thread Gudmundur Bjarni Josepsson
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Mogens N=F8rgaar wrote:

> Martin Berg's method of "Throw-away of rows"

Where can this be found?

Gudmundur


=DEessi p=F3stur var sendur me=F0 vefp=F3sti mi, http://www.mi.is
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Author: Gudmundur Bjarni Josepsson
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