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The addProject procedure is called to add a record to the Projects table, as follows: CREATE PROCEDURE addProject ( @id uniqueidentifier, @name varchar(50), @started datetime, @ended datetime, @description varchar(MAX), @newLastChanged timestamp output ) AS INSERT INTO Projects (Id,Name,Started,Ended,Description) VALUES (@id,@name,@started,@ended,@description) SELECT @newLastChanged = LastChanged FROM Projects WHERE Id=@id RETURN Note that this adds only the record to the Projects table; a separate stored procedure adds records to the Assignments table. This stored procedure includes not only an INSERT statement but also a SELECT statement that loads an output parameter value. This is required to support concurrency. Recall that all the tables in the database include a timestamp column, which is incremented automatically each time a row is inserted or updated. As you ll see in 18, the business object must keep track of this value. Since the value changes any time the row changes, the value is returned as the result of any INSERT or UPDATE operation.

That is a typical serial plan. No parallelism is involved because we did not request parallel query to be enabled, and by default it will not be. We may enable parallel query in a variety of ways, including use of a hint directly in the query or by altering the table to enable the consideration of parallel execution paths (which is the option we use here). We can specifically dictate the degree of parallelism to be considered in execution paths against this table. For example, we can tell Oracle, We would like you to use parallel degree 4 when creating execution plans against this table. This translates into the following code: big_table@ORA11GR2> alter table big_table parallel 4; Table altered. I prefer to just tell Oracle, Please consider parallel execution, but you figure out the appropriate degree of parallelism based on the current system workload and the query itself. That is, let the degree of parallelism vary over time as the workload on the system increases and decreases. If we have plenty of free resources, the degree of parallelism will go up; in times of limited available resources, the degree of parallelism will go down. Rather than overload the machine with a fixed degree of parallelism, this approach allows Oracle to dynamically increase or decrease the amount of concurrent resources required by the query. We simply enable parallel query against this table via the ALTER TABLE command:

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big_table@ORA11GR2> alter table big_table parallel; Table altered. That is all there is to it parallel query will now be considered for operations against this table. When we rerun the explain plan, this time we see the following: big_table@ORA11GR2> explain plan for 2 select count(status) from big_table; Explained. big_table@ORA11GR2> select * from table(dbms_xplan.display); PLAN_TABLE_OUTPUT ----------------------------------------Plan hash value: 1651916128 ---------------------------------------------------------------------------|Id | Operation | Name |Cost(%CPU)| TQ |IN-OUT|PQ Distrib | ---------------------------------------------------------------------------| 0| SELECT STATEMENT | | 4465 (1)| | | | | 1| SORT AGGREGATE | | | | | | | 2| PX COORDINATOR | | | | | | | 3| PX SEND QC (RANDOM) | :TQ10000 | |Q1,00| P->S |QC (RAND) | | 4| SORT AGGREGATE | | |Q1,00| PCWP | | | 5| PX BLOCK ITERATOR | | 4465 (1)|Q1,00| PCWC | | | 6| TABLE ACCESS FULL| BIG_TABLE| 4465 (1)|Q1,00| PCWP | | ----------------------------------------------------------------------------

Since those who are at rest with respect to a frame of reference appear to experience time at its normal or fastest rate, the experience of time by a network administrator on board a space station ferrying an NTP stratum 1 reference clock into the vastness of outer space should vary from that of his or her compatriot observing the space vehicle from the safe and secure surroundings of an earthly lab Sam did not have to be convinced that without a relativistic NTP the earthbound , administrators might experience time-related problems in their attempts to maintain NTP synchronization with the distant fast-moving space vehicles and satellites His current point of vantage offered him that perspective already, even without delving into their theories But even that wasn t quite it for NTP To escape the planetary gravity and .

Note The ROWS, BYTES, and TIME columns were removed from this plan output to allow it to fit on the page.

Not only are records added to the Projects table, but the application must allow them to be changed. The updateProject procedure provides this capability, as shown here: CREATE PROCEDURE updateProject ( @id uniqueidentifier, @name varchar(50), @started datetime, @ended datetime, @description varchar(MAX), @lastChanged timestamp, @newLastChanged timestamp output ) AS UPDATE Projects SET Name=@name, Started=@started, Ended=@ended, Description=@description

The aggregate time for the query, however, was 00:00:54 as opposed to the previous estimate of 00:06:29 for the serial plan. Remember, these are estimates, not promises! Also, this is the plan output from Oracle 11g Release 2 the plan output from Oracle9i would have less detail (four steps instead of seven), but the net effect is identical.

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