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CHAPTER 2 ORACLE FUNDAMENTALS
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So, in Oracle, in the default transaction mode of READ COMMITTED (you ll learn about transactions and transaction modes in 4), the data a query sees and returns comes from a single point in time. In other words, the results are consistent with respect to the point in time at which the query began execution. This phenomenon is called statement-level read consistency. The vast majority of Oracle applications use the default transaction mode of READ COMMITTED. Oracle can also provide transaction-level read consistency, which means all queries within a transaction see and return data from a single point of time the point at which the transaction began. Transaction-level read consistency is triggered when you set the transaction mode to either SERIALIZABLE or READ ONLY. The term multiversion read consistency encapsulates both statement-level and transaction-level read consistency. Because multiversion read consistency directly impacts the results of a query that developers write, you must take it into account when designing your system. Let s now look at an example that illustrates statement-level read consistency. In this example, we first create a simple table, t1, with one number column, x, as follows: benchmark@ORA10G> create table t1 2 ( 3 x number 4 ); Table created. We insert and commit a record in this table next: benchmark@ORA10G> insert into t1 values ( 1 ); 1 row created. benchmark@ORA10G> commit; Commit complete. We then create a PL/SQL procedure, p, which returns in its out parameter, p_cursor, a ref cursor pointing to a query that selects all records from table t1. In the same procedure, we insert and commit four more records into table t1 after opening the cursor: benchmark@ORA10G> create or replace procedure p ( p_cursor out sys_refcursor ) is 2 begin 3 open p_cursor for 4 select * from t1; 5 insert into t1 values ( 5 ); 6 insert into t1 values ( 2 ); 7 insert into t1 values ( 3 ); 8 insert into t1 values ( 4 ); 9 commit; 10 end; 11 / Procedure created.
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We then execute the procedure and print the results of the ref cursor we opened (representing the result set of the query): benchmark@ORA10G> variable c refcursor; benchmark@ORA10G> exec p( :c ) PL/SQL procedure successfully completed. benchmark@ORA10G> print c; 1 If we were not aware of the multiversion read consistency feature, we might expect the cursor to print all five records that we know exist in table t1 at this point of time. After all, at the point where we retrieve the cursor values, there are five records inserted and committed in table t1. But the results show that only one record is printed. This demonstrates the concept of multiversion read consistency, due to which our query s result set was preordained at the time its execution began (or in this case, at the time we opened the cursor pointing to the query).
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Note For further details on this very important concept, please see s 4 and 13 of Oracle Database
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Concepts Guide (10g Release 1).
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By writing effective code, I mean writing application code that uses the Oracle database in the most efficient manner. It is quite easy to write code that works with the Oracle database, but you will often find, if you investigate, that your code is performing much slower than with other available alternatives, is hogging shared resources in the database (thus affecting performance and scalability), or is simply making the database do unnecessary work in achieving a particular task. The mantra in this book is that we should not just produce code that works ; we should produce code that works well. We test our code rigorously at every stage, using the tools described in 1, and we prove that it doesn t consume too many system resources, and that it doesn t make the database perform more work than is necessary to complete a given task. The following sections cover techniques to help you achieve these goals.
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