在10gR2下，物理限制参考下表：
|
Item |
Type of Limit |
Limit Value |
|
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) | |
|
Maximum per tablespace |
Operating system dependent; usually 1022 | |
|
Maximum per database |
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 | |
|
Database extents |
Maximum per dictionary managed tablespace |
4 GB * physical block size (with K/M modifier); 4 GB (without K/M modifier) |
|
Maximum per locally managed (uniform) tablespace |
2 GB * physical block size (with K/M modifier); 2 GB (without K/M modifier) | |
|
Database file size |
Maximum |
Operating system dependent. Limited by maximum operating system file size; typically 222 or 4 MB 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 statement Control 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 K Number of tablespaces cannot exceed the number of database files because each tablespace must include at least one file |
|
Bigfile Tablespaces |
Number of blocks |
A bigfile tablespace contains only one datafile or tempfile, which can contain up to approximately 4 billion ( 232 ) blocks. The maximum size of the single datafile or tempfile is 128 terabytes (TB) for a tablespace with 32K blocks and 32TB for a tablespace with 8K blocks. |
|
Smallfile (traditional) Tablespaces |
Number of blocks |
A smallfile tablespace is a traditional Oracle tablespace, which can contain 1022 datafiles or tempfiles, each of which can contain up to approximately 4 million (222) blocks. |
|
External Tables file |
Maximum size |
Dependent on the operating system. An external table can be composed of multiple files. |
在11gR2下，物理限制参考下表：
|
Item |
Type of Limit |
Limit Value |
|
Database Block Size |
Minimum |
2048 bytes; must be a multiple of operating system physical block size |
|
Database Block Size |
Maximum |
Operating system dependent; never more than 32 KB |
|
Database Blocks |
Minimum in initial extent of a segment |
2 blocks |
|
Database 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 |
|
Controlfiles |
Size of a control file |
Dependent on operating system and database creation options; maximum of 25,000 x (database block size) |
|
Database files |
Maximum per tablespace |
Operating system dependent; usually 1022 |
|
Database files |
Maximum per database |
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 |
|
Database extents |
Maximum per dictionary managed tablespace |
4 GB * physical block size (with K/M modifier); 4 GB (without K/M modifier) |
|
Database extents |
Maximum per locally managed (uniform) tablespace |
2 GB * physical block size (with K/M modifier); 2 GB (without K/M modifier) |
|
Database file size |
Maximum |
Operating system dependent. Limited by maximum operating system file size; typically 222 or 4 MB blocks |
|
MAXEXTENTS |
Default value |
Derived from tablespace default storage or DB_BLOCK_SIZE initialization parameter |
|
MAXEXTENTS |
Maximum |
Unlimited |
|
Redo Log Files |
Maximum number of logfiles |
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 |
|
Redo Log Files |
Maximum number of logfiles per group |
Unlimited |
|
Redo Log File Size |
Minimum size |
4 MB |
|
Redo Log File Size |
Maximum Size |
Operating system limit; typically 2 GB |
|
Tablespaces |
Maximum number per database |
64 K Number of tablespaces cannot exceed the number of database files because each tablespace must include at least one file |
|
Bigfile Tablespaces |
Number of blocks |
A bigfile tablespace contains only one datafile or tempfile, which can contain up to approximately 4 billion ( 232 ) blocks. The maximum size of the single datafile or tempfile is 128 terabytes (TB) for a tablespace with 32 K blocks and 32 TB for a tablespace with 8 K blocks. |
|
Smallfile (traditional) Tablespaces |
Number of blocks |
A smallfile tablespace is a traditional Oracle tablespace, which can contain 1022 datafiles or tempfiles, each of which can contain up to approximately 4 million (222) blocks. |
|
External Tables file |
Maximum size |
Dependent on the operating system. An external table can be composed of multiple files. |
对比了一下，Controlfiles最大块数由原来的20000增加至25000。（控制文件的block大小默认是16K）
Redo Log File Size最小值由原来的50KB增加至4MB。