Topic: Database Administration >> rowid,urowid
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| joshi |
Posted: Apr 29, 2007 01:40:56 AM |
Total Post: 24
Joined: Apr, 2007
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what manse rowid,urowid
char(n),nchare(date types) |
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 Sabdar Syed |
| Posted: Apr 29, 2007 04:07:33 AM |  |
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Total Post: 35
Joined: Mar, 2007
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A rowid is a pseudo-column that uniquely identifies a row in a table and attached to each row of a table. It is 18 character long, blockno, rownumber are the components of ROWID.
Oracle uses a ROWID datatype to store the address (rowid) of every row in the database.
* Physical rowids store the addresses of rows in ordinary tables (excluding index-organized tables), clustered tables, table partitions and subpartitions, indexes, and index partitions and subpartitions.
* Logical rowids store the addresses of rows in index-organized tables.
A single datatype called the universal rowid, or UROWID, supports both logical and physical rowids, as well as rowids of foreign tables such as non-Oracle tables accessed through a gateway.
A column of the UROWID datatype can store all kinds of rowids. The value of the COMPATIBLE initialization parameter (for file format compatibility) must be set to 8.1 or higher to use UROWID columns.
Regards,
Sabdar Syed,
http://sabdarsyed.blogspot.com
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