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OPT_PARAM and OPTIMIZER_FEATURES_ENABLE
Here’s a question appeared on the oracle-l mailing list recently: Does anyone know if opt_param hint works with optimizer_features_enable in 11.1.0.7? My first thought was “it should work”. Even though...
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Edition name as a property for JDBC thin client
A question on Edition-Based Redefinition appeared on the OTN forum: The purpose is to try to upgrade an app in production. For most application users they will keep using the pre-upgrade app connecting...
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Extended statistics and function-based indexes
About a year ago I’ve discovered nice feature of Oracle 10gR2 CBO: to overcome an issue with calculated selectivity for predicates on multiple columns, it can use DISTINCT_KEYS of the available index....
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ORDER BY
This is a quick note on the importance of ORDER BY for the order of the result set produced by a SELECT. The mantra is very simple: Without an order_by_clause, no guarantee exists that the same query...
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JIT
Starting with Oracle 11gR1 Oracle JVM includes Just-in-Time compiler. Its goal is to convert JVM bytecode into platform-specific native code based on the performance data gathered in run-time. It is...
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