Physical Database Limits in oracle

1)Data Block Size Limit
Minimum: 2048 bytes; must be a multiple of operating system physical block size
Maximum: Operating system dependent; Not more than 32 KB

2)Data Blocks Limit
Minimum in initial extent of a segment: 2 data blocks
Maximum per datafile: Platform dependent; typically power(2,22) - 1 blocks

3)Controlfiles Limit
Number of control files: 1 minimum; 2 or more (on separate devices) strongly recommended.
Size of a control file: Maximum of 20,000 * (database block size)

4)Datafiles Limit
Maximum per tablespace: 1022
Maximum per database: 65533

Also, limited by the DB_FILES initialization parameter for a particular instance.

5)Database extents Limit
Maximum per dictionary managed tablespace: 4 GB * physical block size.
Maximum per locally managed (uniform) tablespace: 2 GB * physical block size.

6)Database file size Limit
Limited by maximum operating system file size.

7)MAXEXTENTS Limit
Default value: Derived from tablespace default storage or DB_BLOCK_SIZE initialization parameter
Maximum: Unlimited

8)Redo Log Files Limit
Maximum number of logfiles: Limited by value of MAXLOGFILES parameter in the CREATE DATABASE statement.
Maximum number of logfiles per group: Unlimited

9)Redo Log File Size Limit
Minimum size: 50 KB
Maximum size: Operating system limit.

10)Tablespaces:
Maximum number per database: 65533

11)Bigfile Tablespaces
Number of blocks: power(2,32)

12)Smallfile Tablespaces:
Number of blocks: power(2,22)

13)External Tables file
Maximum size: OS dependent.

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