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Its capabilities are similar to those provided by other object-relational databases, such as Informix Universal Server When a stored procedure reads an Oracle LOB column from a table, Oracle does not actually return the contents of the column Instead, a locator for the LOB data (in object parlance, a handle for the LOB) is returned The locator is used in conjunction with more than 35 special LOB-processing functions that the stored procedure DBMS_LOB can then use.

want the names repeated. You can use the DISTINCT keyword to ensure that your query returns the name of each CD only one time, or you can use the ALL keyword to specify that all rows be returned, even if there are duplicates. If you don t specify either of the keywords, the ALL keyword is assumed.

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to manipulate the actual data stored in the LOB column of the database Here is a brief description of some of LOB-processing functions available in the DBMS_LOB stored procedure: DBMS_LOBREAD(locator, length, offset, buffer) Reads into the PL/SQL buffer the indicated number of bytes/characters from the LOB identified by the locator, starting at the offset DBMS_LOBWRITE(locator, length, offset, buffer) Writes the indicated number of bytes/characters from the PL/SQL buffer into the LOB identified by the locator, starting at the offset DBMS_LOBAPPEND(locator1, locator2) Appends the entire contents of the LOB identified by locator2 to the end of the contents of the LOB identified by locator1 DBMS_LOBERASE(locator, length, offset) Erases the contents of the LOB identified by the locator at offset for length bytes/characters; for characterbased LOBs, spaces are inserted, and for binary LOBs, binary zeroes are inserted DBMS_LOB.

COPY(locator1, locator2, length, offset1, offset2) Copies length bytes/characters from the LOB identified by locator2 at offset2 into the LOB identified by locator1 at offset1 DBMS_LOBTRIM(locator, length) Trims the LOB identified by the locator to the indicated number of bytes/characters DBMS_LOBSUBSTR(locator, length, offset) Returns (as a text string return value) the indicated number of bytes/characters from the LOB identified by the locator, starting at the offset; the return value from this function may be assigned into a PL/SQL VARCHAR variable DBMS_LOBGETLENGTH(locator) Returns (as an integer value) the length in bytes/characters of the LOB identified by the locator DBMS_LOBCOMPARE(locator1, locator2, length, offset1, offset2) Compares the LOB identified by locator1 to the LOB identified by locator2, starting at offset1 and offset2, respectively, for length bytes/ characters; returns zero if they are the same and nonzero if they are not DBMS_LOB.

depending on system activity and configuration. A pool of threads handles each of the networks that SQL Server simultaneously supports, another thread handles database checkpoints, another handles the lazywriter process, while another handles the log writer. A separate thread is also available for general database cleanup tasks, such as periodically shrinking a database that is in auto-shrink mode. Finally, a pool of threads handles all user commands.

You state that you can use an asterisk to include all columns in the query result. Does this ever present a problem if the number of columns changes Yes, this can present a problem. In fact, it is generally recommended that you use the asterisk only when you re accessing an SQL database through direct invocation. If you use the asterisk in embedded SQL and the number of columns changes, you might find that your application no longer responds correctly because the application program was coded to expect a specific response. If an asterisk is used and specific columns are expected to be returned, then you could run into a number of surprises if the database has been changed. For this reason, you should avoid the asterisk unless directly invoking a SELECT statement. However, in the case of direct invocation, the asterisk is a handy way to return all columns without having to specify the name of each one. In fact, many of the examples in the chapter use the asterisk to avoid having to repeat column names unnecessarily.

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