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TABLE SPACE
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Table space is a storage location where the actual data underlying database object
can be kept.
A common use of table space is to optimize performance.
Tables paces to store their data in a system file, a single file must be part of a single
tables pace.
It provides a layer of abstraction between physical layer and logical data, and serves
to allocate storage for all DBMS managed segments
A database segment is a database object which occupies physical space such as
table and index
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Table space can be referred by name when creating database segments.
Table space specify only the database location [not the logical structure or database
schema]
Different objects in the same schema may have different underlying table space.
Similarly a table space may service segments for more than one schema. Sometimes
it can be used to specify schema as to form bond between logical and physical data.
ADMINISTATOR :
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By using table space admin can control disk layout of an installation. A common
use of table space is to optimize performance. For example a heavily used index can
be placed on a fast SCSI disk. A DB table which contains archived data that is rarely
accessed could be stored on a less expensive but slower IDE disk.
SCSI disk :
Small Computer System Interface. It is a set of standard for physically connecting
and transferring data between computers and peripheral device.
IDE:
Integrated Drive Electronics
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RAW DEVICE:
Some database management systems allow table spaces to be configured
directly over operating-system device entries, called raw devices, providing better
performance by avoiding the OS file system overheads.