SQL vs. PL/SQL

Which piece of code will be faster (clue – the table in question has no indexes):

Option 1 – pure SQL


update join1 set
        data = data||'#'
where   key_1=500
and     key_2=23851
and     key_3=57012
and     key_4=521
and     key_6=1
and     key_7=23352
;

Option 2 – a silly PL/SQL row by row approach:


declare
        type rowid_type is table of urowid index by binary_integer;
        tab_rowid           rowid_type;  

        lv_rows_updated     number :=0;  

        cursor my_cursor is
                select  rowid rid
                from    join1
                where   key_1=500
                 (more...)

Reverse Key

A question came up on the OTN database forum recently asking if you could have a partitioned index on a non-partitioned table.

(I’m not sure whether it would be quicker to read the manuals or try the experiment – either would probably bothere quicker than posing the question to the forum. As so often happens in these RTFM questions the OP didn’t bother to acknowledge any of the responses)

The answer to the question is (more...)

Predicate Order

A recent OTN post demonstrated a very important point about looking at execution plans – especially when you don’t use the right data types. The question was:

We’ve this query which throws invalid number

SELECT * FROM table A
WHERE A.corporate_id IN (59375,54387) AND TRUNC(created_dt) BETWEEN '19-DEC-14' AND '25-DEC-14';

However it works fine if we use not in instead of in

SELECT * FROM table A  
WHERE A.corporate_id  NOT IN (59375,54387) AND  (more...)

Understanding SQL

From time to time someone publishes a query on the OTN database forum and asks how to make it go faster, and you look at it and think it’s a nice example to explain a couple of principles because it’s short, easy to understand, obvious what sort of things might be wrong, and easy to fix. Then, after you’ve made a couple of suggestions and explained a couple of ideas the provider simply fades into (more...)

Migrated rows

I received an email recently describing a problem with a query which was running a full tablescan but: “almost all the waits are on ‘db file sequential read’ and the disk read is 10 times the table blocks”.  Some further information supplied was that the tablespace was using ASSM and 16KB block size; the table had 272 columns (ouch!) and the Oracle version was 11.2.0.4.

In his researches he had (more...)

select * from table where rownum=1

I never thought I would have to optimize so simple query as

select col1, col2, col4, col7 from table where rownum=1

(even though I read recently “SELECT * FROM TABLE” Runs Out Of TEMP Space)
But a few days ago frequent executions of this query caused big problems on the one of our databases(11.2.0.3) because of adaptive serial direct path reads.

I don’t know why, but I felt intuitively that full (more...)

New Version Of XPLAN_ASH Utility – In-Memory Support

A new version 4.21 of the XPLAN_ASH utility is available for download. I publish this version because it will be used in the recent video tutorials explaining the Active Session History functionality of the script.

As usual the latest version can be downloaded here.

This is mainly a maintenance release that fixes some incompatibilities of the 4.2 version with less recent versions (10.2 and 11.2.0.1).

As an extra however, (more...)

ORA-19599 block corruption when filesystemio_options=SETALL on ext4 file system using Linux

Few days ago I experienced strange issue in my development environment running on OEL 5.8 with EXT4 filesystem. Note - EXT4 filesystem is supported from OEL 5.6 version.

This was virtual machine running oldish 10.2.0.5.0 Oracle database.

I noticed that backup for my database is failing because of archive log corruption. As this is development database I've simply deleted corrupted archive logs and initiated full backup again. But backup (more...)

New Version Of XPLAN_ASH Utility

A new version 4.2 of the XPLAN_ASH utility is available for download.

As usual the latest version can be downloaded here.

There were no too significant changes in this release, mainly some new sections related to I/O figures were added.

One thing to note is that some of the sections in recent releases may require a linesize larger than 700, so the script's settings have been changed to 800. If you use corresponding settings (more...)

Data Pump and AQ_TM_PROCESSES

First things first: Thou shalt not explicitly set AQ_TM_PROCESSES=0 ! Unless, of course, you want to disable the Queue Manager Process (QMNC in Oracle 11.x). Which you may want to do during database upgrades to prevent Streams or Advanced Queueing from interfering with the upgrade process. However, if you don’t reset this parameter afterwards, you might run […]

Datapump Bug: Scheduler Jobs Not Imported in 11.2

Just the other day I hit the unpublished Bug 16445132: DBMS_SCHEDULER PROBLEM WITH DATABASE MIGRATION VIA EXPDP/IMPDP. It affects Scheduler Jobs that were created to end with a corresponding Scheduler Window. Here’s an excerpt of a Data Pump Logfile: ORA-39083: Object type PROCOBJ failed to create with error: ORA-27469: STOP_ON_WINDOW_EXIT is not a valid job […]

PeopleTools 8.54 Feature: Application Engine Trace File Enhancements

In this blog, we have been reviewing the new features of PeopleTools 8.54. Today is the turn of Application Engine, particularly on its troubleshooting. This release of PeopleTools include several enhancements on Application Engine tracing, which are outlined below:


  • The .AET trace file can now include the PeopleCode trace. This removes the need of checking the .AET file for the the non-PeopleCode steps and the .TRC file for the PeopleCode steps. Surely, .TRC files (more...)

Being Right and Proving It

One of the great things about working in IT is that you can often win an argument simply by being right. Not because of who you are or because you are more eloquent than others, but because the facts support your position. Almost every IT person I have ever met respects facts.

In order to win arguments this way, you of course need some facts to work with. And that’s where too many people fail. (more...)

Debugging Faulty Assumptions

I wanted to install Oracle JDevelper 12.1.3 – a version that I had been eagerly awaiting. Since my primary machine is a MacBook, I wanted to install it on OS X 10.9.3.

I downloaded the generic installer and found that the install didn’t run. Since OS X had disappeared from the documentation, I assumed that I would have to fiddle around until I found a combination of JDK and OS (more...)

Database Shutdown With crsctl

I noticed something for the first time tonight when I was playing around in the Enkitec lab – something that I have been doing wrong for a while.  When working in the lab, I often rely on the crsctl command to shut down the entire cluster stack for me.  It’s really easy to use “crsctl stop cluster -all” followed by “dcli -l root -g ~/dbs_group /u01/app/11.2.0.4/grid/bin/crsctl stop crs” to get everything down (more...)

SCAN VIP Troubleshooting

We had a client that was running into a strange issue on their Exadata where new connections coming in through the SCAN were failing.  After doing some troubleshooting, it was discovered that it was related to one of the SCAN listeners not properly accepting requests from new sessions.  The VIP and listener were running, and everything looked normal.

We had the following SCAN setup:

SCAN VIP # VIP IP
1 172.25.2.70
2 (more...)

Wrong Result Bug using group-by placement optimization

Last week I’ve mentioned on Twitter that we ran into wrong result bug. We found workaround quickly but I’ve decided to spend some time to reproduce error and write blog post to warn you about this optimizer behavior.
Special thanks to my colleague who spotted odd results which led us to this finding.

My test (virtual) environment is:
OS: Oracle Enterprise Linux 5.8
DB: Oracle EE 11.1.0.7.12

In test I (more...)

November/December Highlights

In the Oracle technical universe, it seems that the end of the calendar year is always eventful. First there’s OpenWorld: obviously significant for official announcements and insight into Oracle’s strategy. It’s also the week when many top engineers around the world meet up in San Francisco to catch up over (more...)

When error say nothing about real issue

We want restore backup from source. So we took backup from source and copied it to /dba/share/MYDB on target. My collouge sent me email saying  restore failed with following error


rman target /

Recovery Manager: Release 11.2.0.3.0 - Production on Wed Sep 18 20:47:38 2013

Copyright (more...)

Oracle BI Publisher Desktop Microsoft Visual Basic System Error &H8000FFFF -2147418113 Catastrophic failure

Not too sure what I changed on my laptop, possibly just installation of another product or perhaps Microsoft or similar updates, but when I went to edit a BI Publisher RTF template I got the following error message on clicking ANY button in the BI Publisher plugin for Microsoft Word.

 (more...)