Oracle PL/SQL UROWID is a data type used to store the unique row ID of a row in a table. The UROWID data type is a binary data type that is used to uniquely identify a row in a table. It is a pseudo column that is automatically created by Oracle for each row in a table.
The UROWID data type has a fixed length of 16 bytes and contains a binary representation of the physical address of the row. It is unique across all tables and all rows within a database, and is guaranteed to remain the same for the life of the row.
One of the primary uses of the UROWID data type is for efficient access to a specific row in a table. It can be used in queries to quickly retrieve a specific row based on its unique row ID. The UROWID can also be used in PL/SQL code to quickly and efficiently manipulate a specific row.
It is important to note that the UROWID data type should be used with caution, as it exposes internal information about the database structure that could potentially be used to compromise security. For this reason, it is recommended that UROWID values should not be used in URLs or exposed in any way to end users.
In summary, the Oracle PL/SQL UROWID data type is a binary data type that is used to uniquely identify a row in a table. It provides efficient access to specific rows in a table and can be used in PL/SQL code to manipulate specific rows. However, it should be used with caution due to potential security risks.