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Database Block Size
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Minimum
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2048 bytes; must be a multiple of operating system physical block size
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Maximum
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Operating system dependent; never more than 32 KB
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Database Blocks
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Minimum in initial extent of a segment.
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2 blocks
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Maximum per datafile
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Platform dependent; typically 222-1 blocks
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Controlfiles
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Number of control files
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1 minimum; 2 or more (on separate devices) strongly recommended
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Size of a control file
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Dependent on operating system and database creation options; maximum of 20,000 x (database block size)
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Database files
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Maximum per tablespace
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Operating system dependent; usually 1022
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Maximum per database
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65533
May be less on some operating systems
Limited also by size of database blocks and by the DB_FILES initialization parameter for a particular instance
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Database extents
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Maximum
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4 GB, regardless of the maximum file size allowed by the operating system
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Database file size
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Maximum
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Operating system dependent. Limited by maximum operating system file size; typically 222 or 4M blocks
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MAXEXTENTS
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Default value
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Derived from tablespace default storage or DB_BLOCK_SIZE initialization parameter
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Maximum
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Unlimited
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Redo Log Files
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Maximum number of logfiles
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Limited by value of MAXLOGFILES parameter in the CREATE DATABASE statement
Control file can be resized to allow more entries; ultimately an operating system limit
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Maximum number of logfiles per group
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Unlimited
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Redo Log File Size
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Minimum size
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50 KB
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Maximum size
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Operating system limit; typically 2 GB
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Tablespaces
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Maximum number per database
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64 K
Number of tablespaces cannot exceed the number of database files, as each tablespace must include at least one file
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