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alexzeng.wordpress.com | ||
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jonathanlewis.wordpress.com
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| | | | | Following yesterday's note on SQL Profiles, someone asked how I detect that an opt_estimate hint had been used - with specific reference to the "index_scan" option. The reason for this particular choice is that other opt_estimate hints have a highly visible impact in the 10053 trace files, but this one doesn't. Here are a few... | |
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carlos-sierra.net
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| | | | | SQLTXPLAIN, also know as SQLT, is a tool that helps to diagnose SQL statements performing poorly in an Oracle database. This tool is free to download and use. You only need to have access to My Oracle Support (MOS) and search for Document Id: 215187.1. Q: What do you get from this tool? A: In... | |
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orastory.wordpress.com
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| | | | | There have been some interesting posts from Marcin Przepiorowski and Kerry Osborne about mapping sql plan management (spm) baselines to a corresponding sql id. The key to sql plan baselines (DBA_SQL_PLAN_BASELINES) is SIGNATURE. And why signature? It's not just another change to the key to identifying sql statements (HASH_VALUE -> (NEW_)HASH_VALUE / OLD_HASH_VALUE -> SQL_ID).... | |
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tanelpoder.com
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| | | Update: As this original article is from 2007, there are better options available in the modern times for example DBMS_UTILITY.EXPAND_SQL_TEXT as explained by Maria Colgans blog entry here. If you have been involved in tuning SQL code which you have never seen before, you are probably familiar with the challenges of understanding what the code is trying to do. This can be especially time consuming when the SQL references lots of views, which reference views, which reference more views etc. So there may ... | ||
