GyeongjuGlory
Thu Oct 03 2024
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6 answers
1370
What is the All_rows hint?
Could you please elaborate on what exactly the 'All_rows' hint represents in the context of database queries? I'm curious to understand its purpose, when it's typically used, and how it might affect query performance. Additionally, are there any scenarios where it's advisable to avoid using the 'All_rows' hint, and if so, why?
DondaejiDelight
Wed Oct 02 2024
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6 answers
929
What is a hint in SQL?
Could you please explain to me what exactly a hint in SQL is? I've heard of it being used to provide the database optimizer with suggestions on how to execute a query, but I'm not entirely clear on the specifics. Are hints mandatory for writing efficient SQL queries? How do they differ from other query optimization techniques? Are there any potential drawbacks or risks associated with using hints in SQL? I'd appreciate any insights you can provide on this topic.
BlockchainVisionary
Tue Oct 01 2024
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5 answers
781
What is /*+ parallel */ in SQL?
Could you please explain what exactly is "/*+ parallel */" in SQL, and how it is used? I'm curious to know how it can help in improving query performance and what are the considerations one should make before using it. Is it a common practice in SQL optimization, and are there any potential drawbacks or limitations to be aware of? Thank you in advance for your insights.
