Dominic Brooks on Oracle Performance, Tuning, Data Quality & Sensible Design ... (Now with added Sets Appeal)
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OraStory | Dominic Brooks on Oracle Performance, Tuning, Data Quality & Sensible Design … (Now with added Sets Appeal) | orastory.wordpress.com Reviews
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Dominic Brooks on Oracle Performance, Tuning, Data Quality & Sensible Design ... (Now with added Sets Appeal)
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External Resources | OraStory
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Dominic Brooks on Oracle Performance, Tuning, Data Quality and Sensible Design … (Now with added Sets Appeal). A list of resources that I frequently refer to and point others to:. Richard Foote: Index Internals Rebuilding The Truth. Jonathan Lewis: Unbalanced Indexes. Locking inc Unindexed Foreign Keys. Mark Bobak: Understanding and Interpreting Deadlocks. Interpreting LMD Global Wait-for-Graph. Tom Kyte on unindexes foreign keys. Jonathan Lewis: Lock Horror. Jonathan Lewis: Lock Modes. On SQL and PLSQL.
CBO Defaults | OraStory
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Dominic Brooks on Oracle Performance, Tuning, Data Quality and Sensible Design … (Now with added Sets Appeal). This information was posted on oracle-l at some point and was relevant to a version of Oracle at some point. 001 = = = = = = = = = = = = = = = = = = = = = = = = = = = = =. 003 /* defaults */. 005 /* Default selectivities are set low to. 007 1 keep cost values low for future resource limiter use. 009 2 keep cost values low for permutation cutoff in kko. 015 needed for bind variables. 043 #define ...
SQL Plan Management Choices | OraStory
https://orastory.wordpress.com/2015/08/11/sql-plan-management-choices
Dominic Brooks on Oracle Performance, Tuning, Data Quality and Sensible Design … (Now with added Sets Appeal). Quick Cross-Period AWR Comparison →. SQL Plan Management Choices. August 11, 2015. My thoughts on SQL plan management decision points:. Are also available, primarily to avoid a specific problem not to enforce a particular plan, and are not covered in the above flowchart. SQL Plan Management Choices. August 11, 2015 at 1:22 pm. Very nice job Dom. Leave a Reply Cancel reply. Enter your comment here.
Adaptive Cursor Sharing with SQL Plan Baselines | OraStory
https://orastory.wordpress.com/2012/03/22/adaptive-cursor-sharing-and-sql-plan-baselines
Dominic Brooks on Oracle Performance, Tuning, Data Quality and Sensible Design … (Now with added Sets Appeal). Bug with dynamic sampling in 11.2.0.3. SQL Patch IV – Why is the SQL Patch applied but not effective? Adaptive Cursor Sharing with SQL Plan Baselines. March 22, 2012. Maybe you, like me, have read documentation that says SQL Plan Baselines work together Adaptive Cursor Sharing and wondered what this means? ACS and baselines do work together. 1 The bind awareness will kick back in eventually.
Beware the compound trigger | OraStory
https://orastory.wordpress.com/2009/01/20/beware-the-compound-trigger
Dominic Brooks on Oracle Performance, Tuning, Data Quality and Sensible Design … (Now with added Sets Appeal). Adventures with VPD I: Result Cache →. Beware the compound trigger. January 20, 2009. In 11g, Oracle introduced a new feature in the compound trigger. Through many years and versions, the solution to the mutating table. Ora-04091 problem was often a clumsy combination of packaged global, before statement trigger, after row trigger and after statement trigger. New Features: Compound Triggers.
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12c « SQLMDX
https://sqlmdx.net/tag/12c
Eventually it's all about data. Dsvolk Oracle News [ru]. Posts Tagged ‘12c’. Fetch first … percent. On December 19, 2015. New syntax for so called “Top N” queries was introduced in Oracle 12c. It can be used to return either fixed number of rows or specified percent of rows in a table. Obviously latter requires to know the total number of rows to return the result so let’s check what is happening under the hood in this case. Read the rest of this entry ». Context switches may not be an issue any longer.
built-in packages « SQLMDX
https://sqlmdx.net/tag/built-in-packages
Eventually it's all about data. Dsvolk Oracle News [ru]. Posts Tagged ‘built-in packages’. On September 27, 2014. Dbms comparison was introduced in 11g as a powerful tool to compare and synchronize table data in different tables. Even though it’s quite flexible it has some limitations:. 1 The tables are supposed to be in different databases. Therefore if you want to compare tables in the same database you will need to create fake db link. 2 The tables must have unique indexes. Blog at WordPress.com.
2014 September « SQLMDX
https://sqlmdx.net/2014/09
Eventually it's all about data. Dsvolk Oracle News [ru]. Archive for September, 2014. On September 30, 2014. Almost everyone who has some experience with Oracle knows about notorious notion called “context switches” between SQL and PL/SQL engines. You can find a great explanation of context switches by Tom Kyte here. Read the rest of this entry ». On September 27, 2014. Dbms comparison was introduced in 11g as a powerful tool to compare and synchronize table data in different tables.
2014 May « SQLMDX
https://sqlmdx.net/2014/05
Eventually it's all about data. Dsvolk Oracle News [ru]. Archive for May, 2014. Amending statistics list for autotrace. On May 24, 2014. I wonder why Oracle has not added possibility to change the list of statistics for autotrace but unfortunately that’s a fact. You cannot change the default format of the statistics report. However there are at least three different ways to view the extended list of statistics for given session. Advantage is the ease of monitoring several sessions with the same client id.
2013 December « SQLMDX
https://sqlmdx.net/2013/12
Eventually it's all about data. Dsvolk Oracle News [ru]. Archive for December, 2013. Query transformations in Oracle: join elimination. On December 14, 2013. Join elimination appeared in Oracle version 10gR2. Read the rest of this entry ». Query transformations in Oracle: or-expansion. On December 8, 2013. As you may know there are two types of query transformations in Oracle: heuristic-based and cost-based. Read the rest of this entry ». Blog at WordPress.com.
2014 October « SQLMDX
https://sqlmdx.net/2014/10
Eventually it's all about data. Dsvolk Oracle News [ru]. Archive for October, 2014. Yet another approach to overcome bloom filter bug. On October 4, 2014. Bloom filter may help to dramatically reduce amount of data to be read from partitioned table by eliminating unneeded partitions. Is a nice introduction into bloom filters. Unfortunately bloom filter doesn’t work with DML which causes a lot of challenges in 11gR2. However that note doesn’t suggest any workarounds. Read the rest of this entry ».
PowerShell « SQLMDX
https://sqlmdx.net/category/powershell
Eventually it's all about data. Dsvolk Oracle News [ru]. Archive for the ‘PowerShell’ Category. Evolution of regular expressions. On July 2, 2016. Frankly speaking “evoulution” is not quite proper word to title this post. I’m going to show some extensions in regular expressions in different languages in compare to their implementation in Oracle. Oracle supports regular expressions according to POSIX standard draft 1003.2/D11.2 and two extensions. Matching capabilities for multilingual data.
Perl « SQLMDX
https://sqlmdx.net/category/perl
Eventually it's all about data. Dsvolk Oracle News [ru]. Archive for the ‘Perl’ Category. Evolution of regular expressions. On July 2, 2016. Frankly speaking “evoulution” is not quite proper word to title this post. I’m going to show some extensions in regular expressions in different languages in compare to their implementation in Oracle. Oracle supports regular expressions according to POSIX standard draft 1003.2/D11.2 and two extensions. Matching capabilities for multilingual data.
2013 November « SQLMDX
https://sqlmdx.net/2013/11
Eventually it's all about data. Dsvolk Oracle News [ru]. Archive for November, 2013. Query transformations in Oracle: view merging. On November 14, 2013. Query transformations in Oracle is a part of query optimization. In short, query optimization can be divided into three parts. 1 Logical optimization: query transformation. 2 Physical optimization: searching for optimal access paths, join methods, join orders. 3 Cost Estimator: choosing the optimal plan. Read the rest of this entry ».
CBO « SQLMDX
https://sqlmdx.net/tag/cbo
Eventually it's all about data. Dsvolk Oracle News [ru]. Posts Tagged ‘CBO’. Query transformations in Oracle: join elimination. On December 14, 2013. Join elimination appeared in Oracle version 10gR2. Read the rest of this entry ». Query transformations in Oracle: or-expansion. On December 8, 2013. As you may know there are two types of query transformations in Oracle: heuristic-based and cost-based. Read the rest of this entry ». Query transformations in Oracle: view merging. On November 14, 2013. 2 Phy...
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OraStory | Dominic Brooks on Oracle Performance, Tuning, Data Quality & Sensible Design … (Now with added Sets Appeal)
Dominic Brooks on Oracle Performance, Tuning, Data Quality and Sensible Design … (Now with added Sets Appeal). Blocking Prepared XA Transaction. January 20, 2018. There was an oracle-l thread. Last month about blocking sessions which could not be identified. I replied back about a very niche scenario which I’d seen a few times before. And it’s just happened again so I thought it would be useful to just post some evidence on this. Here are a couple of articles posted previously on XA transactions:. What I...
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