Oracle Rule Based Optimizer (RBO)
Versions prior to 10.10

General Information
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For how many years have you been working with physical servers that are starving your database of the memory necessary to deploy important new performance features such as the Result Cache, Memoptimize Pool, In-Memory Aggregation, In-Memory Column Store, and Full Database Caching? Too long? Contact me to learn how to improve all queries ... not just some queries.
 
Access paths and their ranking
Path 1 Single Row by Rowid
Path 2 Single Row by Cluster Join
Path 3 Single Row by Hash Cluster key with Unique or Primary Key
Path 4 Single Row by Unique or Primary Key
Path 5 Clustered Join
Path 6 Hash Cluster Key
Path 7 Indexed Cluster Key
Path 8 Composite Index
Path 9 Single-Column Index
Path 10 Bounded Range Search on Indexed Columns
Path 11 Unbounded Range Search on Indexed Columns
Path 12 Sort-Merge Join
Path 13 MAX or MIN of Indexed Column
Path 14 ORDER BY on Indexed Column
Path 15 Full Table Scan

Related Topics
Tuning

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