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SQL Tuning: practice and annotations

SQL Tuning: practice and annotations. Cитуации из жизни, эксперименты, исследования на тему настройки производительности СУБД Oracle. Пятница, 11 июля 2014 г. Materialize subquery on Active DataGuard. Due to some bug Oracle can fail to materialize subquery from with . as clause on Active DataGuard with error. ORA-00604: error occurred at recursive SQL level 2. ORA-16000: database open for read-only access. Please consult Oracle Support before using this on production system. Посилання на цей допис. This ...

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SQL Tuning: practice and annotations | practical-sql-tuning.blogspot.com Reviews

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SQL Tuning: practice and annotations. Cитуации из жизни, эксперименты, исследования на тему настройки производительности СУБД Oracle. Пятница, 11 июля 2014 г. Materialize subquery on Active DataGuard. Due to some bug Oracle can fail to materialize subquery from with . as clause on Active DataGuard with error. ORA-00604: error occurred at recursive SQL level 2. ORA-16000: database open for read-only access. Please consult Oracle Support before using this on production system. Посилання на цей допис. This ...

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3 опубліковано yuri pedan

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SQL Tuning: practice and annotations | practical-sql-tuning.blogspot.com Reviews

https://practical-sql-tuning.blogspot.com

SQL Tuning: practice and annotations. Cитуации из жизни, эксперименты, исследования на тему настройки производительности СУБД Oracle. Пятница, 11 июля 2014 г. Materialize subquery on Active DataGuard. Due to some bug Oracle can fail to materialize subquery from with . as clause on Active DataGuard with error. ORA-00604: error occurred at recursive SQL level 2. ORA-16000: database open for read-only access. Please consult Oracle Support before using this on production system. Посилання на цей допис. This ...

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practical-sql-tuning.blogspot.com

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SQL Tuning Blog: July 2014

http://www.practical-sql-tuning.blogspot.com/2014_07_01_archive.html

Sometimes it is a rocket science. Materialize subquery on Active DataGuard. Due to some bug Oracle can fail to materialize subquery from with . as clause on Active DataGuard with error. ORA-00604: error occurred at recursive SQL level 2. ORA-16000: database open for read-only access. If subquery does not have materialize hint, the situation can be fixed by setting " with subquery"=INLINE on session or system level. Please consult Oracle Support before using this on production system.

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SQL Tuning Blog: FOR UPDATE SKIP LOCKED

http://www.practical-sql-tuning.blogspot.com/2013/12/for-update-skip-locked.html

Sometimes it is a rocket science. FOR UPDATE SKIP LOCKED. One new thing I`ve learned from recent PL/SQL Challenge quiz is about how SELECT FOR UPDATE SKIP LOCKED works. It does not really lock rows on EXEC phase of query execution (open cursor), when ordinary FOR UPDATE does. Here are two excerpts from SQL Trace:. PARSING IN CURSOR #47354360485408 len=72 dep=1 uid=63 oct=3 lid=63 tim=1386839485248389 hv=4069083409 ad='539eab670' sqlid='csw3rbvt8kk8j'. EXEC #47354360485408:c=0,e=31,p=0, cr=0,cu=0.

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SQL Tuning Blog: August 2011

http://www.practical-sql-tuning.blogspot.com/2011_08_01_archive.html

Sometimes it is a rocket science. TM enqueue with mode=3. There is yet another case when INSERT statement can be blocked. Oracle doesn`t acquire table locks on the child table during insert into parent table. But I`ve discovered something else. Suppose you have a MASTER table and a DETAIL table with UNINDEXED foreign key constraint which references the MASTER table. Foreign key has been created with ON DELETE CASCADE option. And there are some rows in both tables. Session 1 does the following:. Owner, ob...

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SQL Tuning Blog: October 2010

http://www.practical-sql-tuning.blogspot.com/2010_10_01_archive.html

Sometimes it is a rocket science. Preparing a tablespace to become read only. Now I am reading the Oracle Database Administrator's Guide 11g Release 2 (11.2). And I have found some interesting detail here. That chapter says about preparing a tablespace to move in readonly state. And it proposes to take some action for doing blocks cleanout. But documentation suggests using something like this "select count(*) from table". It is not enough! I will use "test" table to demonstrate my point.

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SQL Tuning Blog: May 2010

http://www.practical-sql-tuning.blogspot.com/2010_05_01_archive.html

Sometimes it is a rocket science. Recently I have been rereading Effective Oracle by Design. And I realized something new for myself. Inter alia I reread "Modification DML from Start to Finish" section:. In general, these statement have a query component. In general, a modification statement will find data it needs to update using the consistent-read mechanism described in the previous section. Then it will get that information again in current (as of right now) mode in order to modify it. Engineered Sys...

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2014 November « Sokrates on Oracle

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An answer to everything. Annals of Oracle's Improbable Errors. Frank Zhou's collection. Inside the black magic. Sayan's sql observations. Select concepts from sql. Archive for November, 2014. Why is it not possible to raise an exception when handling no data needed? Posted by Matthias Rogel. On 8 November 2014. It seems impossible to raise an exception when handling no data needed. As expected, we handle exception raised by division by zero, there we dbms output some info and then raise program error.

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2015 March « Sokrates on Oracle

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An answer to everything. Annals of Oracle's Improbable Errors. Frank Zhou's collection. Inside the black magic. Sayan's sql observations. Select concepts from sql. Archive for March, 2015. Overview of all time changes this year via SQL. Posted by Matthias Rogel. On 30 March 2015. Inspired by Laurent Schneider’s remark concerning special time changes in Lord Howe Island. Create a free website or blog at WordPress.com. Follow “Sokrates on Oracle”. Get every new post delivered to your Inbox.

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2014 May « Sokrates on Oracle

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An answer to everything. Annals of Oracle's Improbable Errors. Frank Zhou's collection. Inside the black magic. Sayan's sql observations. Select concepts from sql. Archive for May, 2014. Posted by Matthias Rogel. On 12 May 2014. Blog at WordPress.com. Follow “Sokrates on Oracle”. Get every new post delivered to your Inbox. Build a website with WordPress.com.

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2015 May « Sokrates on Oracle

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An answer to everything. Annals of Oracle's Improbable Errors. Frank Zhou's collection. Inside the black magic. Sayan's sql observations. Select concepts from sql. Archive for May, 2015. The Fundamental theorem of arithmetic – SQL version. Posted by Matthias Rogel. On 26 May 2015. Every positive integer (except the number 1) can be represented in exactly one way apart from rearrangement as a product of one or more primes, see for example Wolfram MathWorld. Posted by Matthias Rogel. On 22 May 2015. After ...

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An answer to everything. Annals of Oracle's Improbable Errors. Frank Zhou's collection. Inside the black magic. Sayan's sql observations. Select concepts from sql. Ἓν οἶδα ὅτι οὐδὲν οἶδα – I know that I don’t know. Oracle enthusiast since 1992. I like java, prefer PL/SQL and love SQL ),. But also DBA, architect, …. Employer http:/ www.vwd.com. Leave a Reply Cancel reply. Enter your comment here. Fill in your details below or click an icon to log in:. Address never made public). Blog at WordPress.com.

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practical-sql-tuning.blogspot.com

SQL Tuning: practice and annotations

SQL Tuning: practice and annotations. Cитуации из жизни, эксперименты, исследования на тему настройки производительности СУБД Oracle. Пятница, 11 июля 2014 г. Materialize subquery on Active DataGuard. Due to some bug Oracle can fail to materialize subquery from with . as clause on Active DataGuard with error. ORA-00604: error occurred at recursive SQL level 2. ORA-16000: database open for read-only access. Please consult Oracle Support before using this on production system. Посилання на цей допис. This ...

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