Written by There are situations where approximate results are superior than exact results. Typically, this is the case when two conditions are met. First, when the time and/or resources needed to produce exact results are much higher than for approximate results. Second, when approximate results are good enough. Approximate results are for example superior in case of […]
Read MoreAdaptive Query Optimization Configuration: Parameters, Preferences and Fix Controls
The aim of this post is to summarize the knowledge about the 12.1 and 12.2 adaptive query optimizer configuration that, as far as I know, is spread over a number of (too many) different sources. First of all, let’s shortly review which adaptive query optimization features exist: Adaptive plans, which are only available in Enterprise […]
Read MoreSQL Trace in Oracle Database Exadata Express Cloud Service
Today I started having a look to the Oracle Database Exadata Express Cloud Service announced last week at Oracle OpenWorld. Note that since the amount of resources provided (in summary, 1 OCPU, 20 or 50 GB of database storage) is very limited, in general, in my opinion that service will only be useful for functional […]
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