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Columns, Columns Everywhere | Oracle Tips and Tricks -- David Fitzjarrell
https://dfitzjarrell.wordpress.com/2015/04/14/columns-columns-everywhere
Oracle Tips and Tricks — David Fitzjarrell. April 14, 2015. Columns, Columns Everywhere. 8212; dfitzjarrell @ 08:54. Many of the things which can never be, often are." - Norton Juster, The Phantom Tollbooth. Select a.* from a join b on . join c on . Throws an ORA-01792 even though none of the involved tables has 1000 columns defined. Let’s look at an example and see what Oracle is doing with the ANSI join:.
Let Me Say That Another Way … | Oracle Tips and Tricks -- David Fitzjarrell
https://dfitzjarrell.wordpress.com/2015/06/17/let-me-say-that-another-way
Oracle Tips and Tricks — David Fitzjarrell. June 17, 2015. Let Me Say That Another Way …. 8212; dfitzjarrell @ 08:50. I never knew words could be so confusing," Milo said to Tock as he bent down to scratch the dog's ear. "Only when you use a lot to say a little," answered Tock. Milo thought this was quite the wisest thing he'd heard all day. - Norton Juster, The Phantom Tollbooth. Http:/ docs.oracle.com/cd/E11882 01/server.112/e26088/statements 10002.htm#SQLRF01702. SQL select * 2 from 3 (select name, qu...
Resurrecting The Dead (or Gee, I Thought That Data Was Gone Forever) | Oracle Tips and Tricks -- David Fitzjarrell
https://dfitzjarrell.wordpress.com/2008/01/09/resurrecting-the-dead-or-gee-i-thought-that-data-was-gone-forever
Oracle Tips and Tricks — David Fitzjarrell. January 9, 2008. Resurrecting The Dead (or Gee, I Thought That Data Was Gone Forever). 8212; dfitzjarrell @ 16:29. Occasionally an end-user does the unthinkable, and changes data permanently (or so it appears) without checking the results before issuing a commit. Ooops. It used to be that to restore that data one had basically two choices:. A) Restore the data from a known good copy made before the changes were enacted. Enter Oracle 10g and later releases where...
Too Much Time | Oracle Tips and Tricks -- David Fitzjarrell
https://dfitzjarrell.wordpress.com/2015/05/01/too-much-time
Oracle Tips and Tricks — David Fitzjarrell. May 1, 2015. 8212; dfitzjarrell @ 12:44. It's bad enough wasting time without killing it." Norton Juster, The Phantom Tollbooth. Let’s create a copy of EMP that has a non-0 degree of parallelism:. SQL CREATE TABLE EMP 2 (EMPNO NUMBER(4) NOT NULL, 3 ENAME VARCHAR2(10), 4 JOB VARCHAR2(9), 5 MGR NUMBER(4), 6 HIREDATE DATE, 7 SAL NUMBER(7, 2), 8 COMM NUMBER(7, 2), 9 DEPTNO NUMBER(2) 10 parallel 4; Table created. SQL. Now let’s make it a fairly large table:. SELECT ...
Some People’s Kids | Oracle Tips and Tricks -- David Fitzjarrell
https://dfitzjarrell.wordpress.com/2015/05/14/some-peoples-kids
Oracle Tips and Tricks — David Fitzjarrell. May 14, 2015. Some People’s Kids. 8212; dfitzjarrell @ 13:39. Expectations is the place you must always go to before you get to where you're going. Of course, some people never go beyond Expectations, but my job is to hurry them along whether they like it or not." - Norton Juster, The Phantom Tollbooth. From time to time I find a situation where a developer believes that:. So far, so good, but let’s look at the second session:. SQL - SQL - Using a sequence and ...
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Oracle SQL | Tag Archives: 12c
http://orasql.org/tag/12c
12c: New SQL PLAN OPERATIONS and HINTS. July 8, 2015. This post is just a compilation of the links to other people’s articles and short descriptions about new SQL PLAN OPERATIONS and HINTS with a couple little additions from me. Continue reading →. 12c: Little test of “TABLE ACCESS INMEMORY FULL” with count stopkey. March 17, 2015. The table has 9M rows:. Oracle 12c: behavior tests of the Inline functions, “Identities” and “defaults”. July 13, 2013. I have done several minitests:. 3 How IDENTITY works?
Oracle SQL | Tag Archives: result_cache
http://orasql.org/tag/result_cache
Tag Archives: result cache. RESULT CACHE: run-time dependency tracking. July 5, 2015. As you know, since 11.2. 8220;relies on”. Clause was deprecated and oracle tracks dependencies at runtime now. Test function and tables. And it works fine with normal tables:. But don’t forget that the result cache also caches such functions with the objects, that usually should not be cached, and such objects will not be listed in the result cache dependencies list:. Note that there is no “RESULT CACHE” line. Recently ...
Oracle SQL | RESULT_CACHE: run-time dependency tracking
http://orasql.org/2015/07/05/result_cache-run-time-dependency-tracking
RESULT CACHE: run-time dependency tracking. July 5, 2015. As you know, since 11.2. 8220;relies on”. Clause was deprecated and oracle tracks dependencies at runtime now. Test function and tables. And it works fine with normal tables:. But don’t forget that the result cache also caches such functions with the objects, that usually should not be cached, and such objects will not be listed in the result cache dependencies list:. The results were cached and the dependencies do not include system objects.
Oracle SQL | Category Archives: CBO
http://orasql.org/category/oracle/cbo-oracle
WINDOW NOSORT STOPKEY RANK(). March 12, 2016. Recently I found that WINDOW NOSORT STOPKEY with RANK()OVER() works very inefficiently: http:/ www.freelists.org/post/oracle-l/RANKWINDOW-NOSORT-STOPKEY-stopkey-doesnt-work. The root cause of this behaviour is that Oracle optimizes WINDOW NOSORT STOPKEY with RANK the same way as with DENSE RANK:. As you can see, A-Rows in plan step 2 = 30 – ie, that is the number of rows where DENSE RANK. 12c: New SQL PLAN OPERATIONS and HINTS. July 8, 2015. February 9, 2015.
Oracle SQL | SQL*Plus tips #7: How to find the current script directory
http://orasql.org/2015/06/26/sqlplus-tips-7-how-to-find-current-script-directory
SQL*Plus tips #7: How to find the current script directory. June 26, 2015. You know that if we want to execute another script from the current script directory, we can call it through @. But sometimes we want to know the current path exactly, for example if we want to spool something into the file in the same directory. So we can simply get this path from the error text:. I used here the reading file content into variable, that I already showed in the “SQL*Plus tips. #1”. Also I did it with. Differences ...
Oracle SQL | Author Archives
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Author Archives: Sayan Malakshinov. WINDOW NOSORT STOPKEY RANK(). March 12, 2016. Recently I found that WINDOW NOSORT STOPKEY with RANK()OVER() works very inefficiently: http:/ www.freelists.org/post/oracle-l/RANKWINDOW-NOSORT-STOPKEY-stopkey-doesnt-work. The root cause of this behaviour is that Oracle optimizes WINDOW NOSORT STOPKEY with RANK the same way as with DENSE RANK:. As you can see, A-Rows in plan step 2 = 30 – ie, that is the number of rows where DENSE RANK. Thanks to all #odevchoice voters!
Oracle SQL | Category Archives: PL/SQL
http://orasql.org/category/oracle/plsql
Oracle package for HTTPS/HTTP[version 0.2]. October 12, 2015. Posted in java stored procedures. Oracle database developer choice award. A couple days ago i created simple package for HTTPS/HTTP. But I’ve decided now to improve it:. 8211; it would be better to control connection time;. Simple page parsing with PCRE regular expressions. 8211; the tool for automatically generating documentation in HTML format.( javadoc. Parameter – so you can choose POST. Added function get last response. October 9, 2015.
Oracle SQL | Category Archives: curious
http://orasql.org/category/curious
A function gets called twice if the result cache is used. July 5, 2015. Recently I showed simple example how result cache works with non-deterministic functions and observed strange behaviour: a function gets fired once in the normal query, but twice with the result cache hint. Moreover, only third and subsequent query executions return same cached results as second query execution. But later I was asked to explain this, so this post is just a short description with test case. With result cache statistics.
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Oracle Tips and Tricks -- David Fitzjarrell | Oracle Tips, Tricks and Information
Oracle Tips and Tricks — David Fitzjarrell. July 31, 2015. What’s In A (User) Name? 8212; dfitzjarrell @ 13:44. So each one of you agrees to disagree with whatever the other one agrees with, but if you both disagree with the same thing, aren't you really in agreement? Norton Juster, The Phantom Tollbooth. Recently a blog post. Nothing unusual there, but now the fun part begins. The business rules for usernames are as follows:. A procedure, like this one, could be written:. This certainly isn’t the ...
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