December 2002
Intermediate to advanced
928 pages
85h 29m
English
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Name
Physical_Attributes_Clause
Synopsis
[INITRANS integer] [MAXTRANS integer] [PCTFREE integer] [PCTUSED integer]
Specifies schema object characteristics affecting space utilization in an Oracle block.
Keywords
- INITTRANS
Specifies the number of transaction entries allocated to each block of the object. The allowed range of values is 1 to 255 and should not normally be changed from the default of 1 (although a value as high as 4 to 8 may be beneficial for an OLTP system with a high transaction rate).
- MAXTRANS
Specifies the maximum number of concurrent transactions that can update a block of the object. Values are 1 to 255 and should not normally be changed from the default. The default is a function of the Oracle block size.
- PCTFREE
Specifies the percentage of space in each data block kept free for future updates to the object. The permissible range of values is 0 to 99. The default value is 10.
- PCTUSED
Specifies the percentage of space in each data block that Oracle attempts to keep filled. The permissible range of values is 0 to 99, and the default is 40. Note that this keyword does not apply to indexes.
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