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alexzeng.wordpress.com
| | www.bobbydurrettdba.com
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| | Sunday night we worked with Oracle Support on a performance issue with a query that had been running for over 14 hours even though it ran the previous weekend in five minutes. Oracle Support showe...
| | 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...
| | 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...
| | akorotkov.github.io
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| [AI summary] The article discusses the challenges and potential solutions for improving selectivity estimation in PostgreSQL's jsonb data type, focusing on statistics collection for efficient query planning.