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IOUG-A Live 2003

www.SageLogix.com. Syntax. Available in Oracle9i Release 2 (v9.2.0.x)Physical storage attribute for tables and materialized views[ CREATE | ALTER ] TABLE [ COMPRESS | NOCOMPRESS ] Can be used for RANGE or LIST partitionsBut cannot be used with HASH partitionsBut cannot be used for HASH or

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IOUG-A Live 2003

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    1. www.SageLogix.com Quick Tips #3 Table Compression Do’s and Don’ts Tim Gorman (tim@sagelogix.com) Principal SageLogix, Inc. IOUG-A “Live 2003”

    2. www.SageLogix.com Syntax Available in Oracle9i Release 2 (v9.2.0.x) Physical storage attribute for tables and materialized views [ CREATE | ALTER ] TABLE … [ COMPRESS | NOCOMPRESS ] … Can be used for RANGE or LIST partitions But cannot be used with HASH partitions But cannot be used for HASH or LIST sub-partitions Can be specified for NESTED tables But cannot be used with any LOB construct Such as CLOB, BLOB, BFILE, and VARRAY Not valid for index-organized or external tables

    3. www.SageLogix.com Syntax Can be set as a DEFAULT attribute on tablespaces Affects both tables and indexes in the tablespace Unless otherwise specified [ CREATE | ALTER ] TABLESPACE … DEFAULT [ COMPRESS | NOCOMPRESS ] STORAGE …

    4. www.SageLogix.com How does it work? Storing repeated data values once in each block A symbol table of data values created in each block The symbol table is stored as another table in the block Each column in a row in a block references back to an entry in the symbol table in the block

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