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They processed the same exact number of rows and very similar numbers of blocks (minor variations coming from accidental ordering of rows in the table and consequential optimizations made by Oracle), used equivalent amounts of CPU time, and ran in about the same elapsed time (run this same test again and the CPU and ELAPSED numbers will be a little different, but on average they will be the same). There are no inherent efficiencies to be gained by placing the columns in order of how discriminating they are, and as stated previously, with index key compression there is an argument for putting the least selective first. If you run the preceding example with COMPRESS 2 on the indexes, you ll find that the first index will perform about two-thirds the I/O of the second, given the nature of the query in this case. However, the fact is that the decision to put column C1 before C2 must be driven by how the index is used. 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This is very similar to the previous version column method, but it uses the base data itself to compute a virtual version column I ll quote the Oracle 10g PL/SQL Supplied Packages Guide (before showing how to use one of the supplied packages!) to help explain the goal and concepts behind a checksum or hash function: A one-way hash function takes a variable-length input string, the data, and converts it to a fixed-length (generally smaller) output string called a hash value The hash value serves as a unique identifier (like a fingerprint) of the input data You can use the hash value to verify whether data has been changed or not Note that a one-way hash function is a hash function that works in one direction. In this case study, I ve shown a fairly small distributed system, whose individual components are all very simple. The complexity of the overall system like most distributed systems is due mainly to the interactions between the various parts. 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