Cryptocurrency Q&A
What is /*+ in Oracle?
What is /*+ in Oracle?
Eleonora
Mon Oct 07 2024
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5 answers
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Can you please clarify what the /*+ */ syntax represents in the context of Oracle database management systems? Is it a specific command, a hint for the optimizer, or perhaps something else entirely? I'm particularly interested in understanding its purpose, how it's used, and any potential implications for query performance or overall database health. Thank you for your time and expertise in addressing this query.
5 answers
GalaxyGlider
Wed Oct 09 2024
The use of optimizer hints in SQL, particularly when denoted by special symbols such as "+", "/*+ */", or "--+", serves as a directive to the optimizer. These hints are essentially suggestions to the query optimizer, guiding it towards a potentially more efficient execution plan.
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Riccardo
Wed Oct 09 2024
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Nicola
Wed Oct 09 2024
The decision to heed or disregard these hints, however, lies solely with the optimizer itself. The optimizer is designed to evaluate the hints against the current database state, workload, and other factors, ultimately determining the best course of action.
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Michele
Wed Oct 09 2024
Oracle, being a sophisticated database management system, does not provide explicit feedback to the user if a hint is ignored. This absence of an error or warning message can be misleading, as it leaves the developer uncertain about the actual impact of the hint.
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CryptoVeteran
Wed Oct 09 2024
Despite this lack of direct communication, it's crucial for developers to understand that hints should be used judiciously and with caution. Misuse of hints can lead to suboptimal query performance, as well as increased maintenance costs over time.
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