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Friday, January 24, 2014. Insert Statement Re-starts on Cursor Invalidation. Here’s a little problem I’ve recently stumbled across when was writing a piece of ETL functionality. The problem is that Oracle restarts an Insert statement over and over when certain criteria is met. Although the full conditions list is known only to Oracle engineers, here are those I was able to deterministically reproduce the issue on Oracle 11.2.0.3 (Linux x64):. The destination table (one to be inserting into) is partitioned.

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antonoal's oracle tips | antonoal.blogspot.com Reviews

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Friday, January 24, 2014. Insert Statement Re-starts on Cursor Invalidation. Here’s a little problem I’ve recently stumbled across when was writing a piece of ETL functionality. The problem is that Oracle restarts an Insert statement over and over when certain criteria is met. Although the full conditions list is known only to Oracle engineers, here are those I was able to deterministically reproduce the issue on Oracle 11.2.0.3 (Linux x64):. The destination table (one to be inserting into) is partitioned.

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antonoal's oracle tips | antonoal.blogspot.com Reviews

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Friday, January 24, 2014. Insert Statement Re-starts on Cursor Invalidation. Here’s a little problem I’ve recently stumbled across when was writing a piece of ETL functionality. The problem is that Oracle restarts an Insert statement over and over when certain criteria is met. Although the full conditions list is known only to Oracle engineers, here are those I was able to deterministically reproduce the issue on Oracle 11.2.0.3 (Linux x64):. The destination table (one to be inserting into) is partitioned.

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antonoal's oracle tips: April 2013

http://antonoal.blogspot.com/2013_04_01_archive.html

Thursday, April 4, 2013. Why my index is being ignored post hardware upgrade? Here's a nice case study how a better hardware can make the existing (poor) code perform worse off. Consider the following query:. Select /* parallel*/ * from t1 where hname = 'RARE VALUE' and id = 2;. The query plan on a slow machine looks like this:. And on the fast like this:. In case you want to reproduce, here's a script to create the T1 table:. Create index t1 idx on t1 (id, hname) pctfree 50;. Subscribe to: Posts (Atom).

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antonoal's oracle tips: September 2010

http://antonoal.blogspot.com/2010_09_01_archive.html

Thursday, September 30, 2010. Recently I've stuck in the problem when the Streams checkpoint wasn't updating the required checkpoint scn and applied scn fields in dba capture. This caused a lot of problems as RMAN couldn't remove the processed logs from the system (it uses the required checkpoint scn to determine whether the Streams still needs those logs). As a result our DBA has raised an SR. With Oracle, which has resulted into th advice to reset the aq tm processes parameter. View my complete profile.

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antonoal's oracle tips: September 2012

http://antonoal.blogspot.com/2012_09_01_archive.html

Friday, September 14, 2012. I’ve never been a fan of using ANSI SQL syntax in Oracle for different reasons. Here is one more to the list. Have a look at the following query:. SELECT dummy FROM dual t1, dual t2, dual t3 WHERE t2.dummy = t1.dummy AND t3.dummy = t1.dummy;. If you run it you will get ORA-00918: column ambiguously defined, cause indeed DUMMY from which table Oracle is supposed to return? Let's rewrite the query using the ANSI SQL:. This behavior looks like a really nasty bug as it conceals er...

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antonoal's oracle tips: SQL Profile for INSERT-ALL

http://antonoal.blogspot.com/2013/06/sql-profile-for-insert-all.html

Wednesday, June 12, 2013. SQL Profile for INSERT-ALL. SQL select count(*) 2 from (select p.* 3 ,value(d) info 4 from dba hist sql plan p 5 ,table(xmlsequence(extract(xmltype(p.other xml), 6 '/other xml/outline data') ) d 7 where other xml is not null) 8 where info is null; COUNT(*) - - - - - 82 SQL. So there were a few of those. What caught my eye though when I checked the actual query plans was the operations which were missing the outlines:. Subscribe to: Post Comments (Atom). View my complete profile.

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antonoal's oracle tips: January 2010

http://antonoal.blogspot.com/2010_01_01_archive.html

Wednesday, January 27, 2010. How CBO calculates cardinality (Part 2). This is the continuation of my previous post which you can read here. According to the book the cardinality for such a condition can be calculated with the formula below:. Cardinality = num rows. 1 / num dist. In case if the range is closed ( = or =). For example lets assume we have a condition column 3. And high value = 12. In that column. In that case the needed range length. Will be high value – const = 12 – 3 = 9. An - Am) / ( high...

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antonoal's oracle tips

Friday, January 24, 2014. Insert Statement Re-starts on Cursor Invalidation. Here’s a little problem I’ve recently stumbled across when was writing a piece of ETL functionality. The problem is that Oracle restarts an Insert statement over and over when certain criteria is met. Although the full conditions list is known only to Oracle engineers, here are those I was able to deterministically reproduce the issue on Oracle 11.2.0.3 (Linux x64):. The destination table (one to be inserting into) is partitioned.

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