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The outlines themselves are managed through the DBMS_OUTLN and DBMS_OUTLN_EDIT Oracle packages. To create outlines for all your current SQL queries, you simply set the initialization parameter CREATE_STORED_OUTLINES to TRUE. The OUTLN user is part of the database when it is created and owns the stored outlines in the database. The outlines are stored in the table OL$. Listing 19-1 shows the structure of the OL$ table. Listing 19-1. The OL$ Table SQL> DESC OL$ Name -----------OL_NAME SQL_TEXT TEXTLEN SIGNATURE HASH_VALUE HASH_VALUE2 CATEGORY VERSION CREATOR TIMESTAMP FLAGS HINTCOUNT SPARE1 SPARE2 SQL> Null ----Type -----------VARCHAR2(30) LONG NUMBER RAW(16) NUMBER NUMBER VARCHAR2(30) VARCHAR2(64) VARCHAR2(30) DATE NUMBER NUMBER NUMBER VARCHAR2(1000)

The SQL_TEXT column has the SQL statement that is outlined. In addition to the OL$ table, the user OUTLN uses the OL$HINTS and OL$NODES tables to manage stored outlines. Create a special tablespace for the user OUTLN and the tables OL$, OL$HINTS, and OL$NODES. By default, they re created in the System tablespace. After you create a new tablespace for user OUTLN, you can use the export and import utilities to move the tables.

To let Oracle automatically create outlines for all SQL statements, use the CREATE_STORED_OUTLINES initialization parameter, as shown here: CREATE_STORED_OUTLINES = TRUE You can also dynamically enable the creation of stored outlines for the entire database by using the ALTER SYSTEM statement, as shown here: SQL> ALTER SYSTEM SET CREATE_STORED_OUTLINES=TRUE; System altered. SQL> In both the preceding cases, the outlines that Oracle creates are assigned to a category called DEFAULT. You also have the option of specifying a named category for your stored outlines. Setting the CREATE_STORED_OUTLINES parameter means that the database creates a stored outline for every distinct SQL statement. This means that the System tablespace could potentially run out of space if you have a large number of SQL statements that are being processed. For this reason, use the CREATE_STORED_ OUTLINES initialization parameter with care. To keep the overhead low, you may instead use the option to create stored outlines at the session level, or just for a lone SQL statement, as shown in the next section.

If an event has multiple subscribers, what order should be used to notify subscribers One approach is to allow subscribers to provide a notification priority when they subscribe. Subscribers can then be notified in order of priority. But what happens if two subscribers have the same priority (or no priority) The most natural order is first-come, first-serve. Ensuring this order is not as easy as one might think. If you chose to manage the list of subscribers using a collection like a C# ArrayList or a Java Vector, you could use the Add method to add a reference to each new subscriber. Subscribers would then be ordered in the collection according to their subscription order. Say there are three subscribers: S1, S2, and S3. Let s see what would happen if S1 later unsubscribed and a new subscriber S4 showed up. When adding S4 to the collection, the collection s Add method might put S4 in S1 s old slot, which is available. If this happened, the subscribers would subsequently be notified in the order S4, S2, S3, which isn t the order you wanted. To prevent this, the collection would have to be normalized each time a subscriber is removed. The normalization process would remove all the empty slots created by Remove operations from the collection.

You can create outlines for a specific statement or a set of statements by using the ALTER SESSION statement, as shown here: SQL> ALTER SESSION SET create_stored_outlines = true; Session altered. SQL> Any statements you issue after the ALTER SESSION statement is processed will have outlines stored for them. To create a stored outline for a specific SQL statement, you use the CREATE OUTLINE statement. The user issuing this command must have the CREATE OUTLINE privilege. The following statement shows how to create a simple outline for a SELECT operation on the employees table: SQL> CREATE OUTLINE test_outline 2 ON SELECT employee_id, last_name 3 FROM hr.employees; Outline created. SQL> You can use the DROP OUTLINE statement to drop an outline, as shown here: SQL> DROP OUTLINE test_outline; Outline dropped. SQL>