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We have, in fact, already seen a couple of cases where we might want to use manual locking. The SELECT...FOR UPDATE statement is the predominant method of manually locking data. We used it in previous examples to avoid the lost update issue, whereby one session would overwrite another session s changes. We ve seen it used as a method to serialize access to detail records to enforce business rules (e.g., the resource scheduler example from 1). We can also manually lock data using the LOCK TABLE statement. This statement is actually used rarely, because of the coarseness of the lock. It simply locks the table, not the rows in the table. If you start modifying the rows, they will be locked as normal. So, this is not a method to save on resources (as it might be in other RDBMSs). You might use the LOCK TABLE IN EXCLUSIVE MODE statement if you were writing a large batch update that would affect most of the rows in a given table and you wanted to be sure that no one would block you. By locking the table in this manner, you can be assured that your update will be able to do all of its work without getting blocked by other transactions. It would be the rare application, however, that has a LOCK TABLE statement in it.

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Suppose you want to create an index on a database table that s already in use. You issue the CREATE INDEX command and get the following message: SQL> CREATE INDEX neims_history_idx ON neims_history(nsaorg_id); NEIMS_HISTORY (NSAORG_ID) * ERROR at line 2: ORA-00054: resource busy and acquire with NOWAIT specified SQL> You can t begin to create the index until you find out which session is locking the neims_history table, and either ask the user to log off or kill the session as a last resort. You can use the V$LOCKED_ OBJECT view to help you get rid of the session locking up the table. First, go to the DBA_OBJECTS data dictionary view and get the object_id of the neims_history table. Once you have the object_id column value for the locked table, you can query the V$LOCKED_OBJECT view, as shown in the following code. Once you have the username and session id (SID), you can use the V$SESSION view to get the corresponding serial number (SERIAL#) and kill the session, thus releasing the lock that s preventing you from creating the index. SQL> SELECT object_id, session_id, oracle_username FROM V$LOCKED_OBJECT;

Oracle actually exposes to developers the enqueue lock mechanism that it uses internally, via the DBMS_LOCK package. You might be wondering why you would want to create your own locks. The answer is typically application specific. For example, you might use this package to serialize access to some resource external to Oracle. Say you are using the UTL_FILE routine that allows you to write to a file on the server s file system. You might have developed a common message routine that every application calls to record messages. Since the file is external, Oracle won t coordinate the many users trying to modify it simultaneously. In comes the DBMS_LOCK package. Now, before you open, write, and close the file, you will request a lock named after the file in exclusive mode, and after you close the file, you will manually release the lock. In this fashion, only one person at a time will be able to write a message to this file. Everyone else will queue up. The DBMS_LOCK package allows you to manually release a lock when you are done with it, or to give it up automatically when you commit, or even to keep it as long as you are logged in.

Assume P1 calls P2 to execute a command. During execution, it may be necessary for P1 to abort execution for any number of reasons, such as excessive time to complete, errors detected in other parts of the system, or unexpected partial results. An interaction is interruptible if the caller can interrupt it before the command has been completed. In theory, either the caller or the callee could interrupt command execution; however, you only consider an interaction to be an interruptible interaction pattern if the caller has control over command termination. If the callee terminates the command prematurely, you consider this to be an ordinary error condition, because no special interactions between caller and callee are necessary in this case. Figure 9-15 shows the basic steps in an interruptible interaction.

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