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