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record, which uses the table as a cursor template, or you can create your own records. Here s a simple example of a record: DECLARE TYPE MeetingTyp IS RECORD ( date_held DATE, location VARCHAR2(20), purpose VARCHAR2(50)); To reference an individual field in a record, you use dot notation, as shown here: MeetingTyp.location

For example, to retrieve the record for employee 123, I can use this query: select * from emp where empno = 123; Alternatively, I can set the bind variable :empno to 123 and execute the following query: select * from emp where empno = :empno; In a typical system, you would query up employee 123 maybe once and then never again Later, you would query employee 456, then 789, and so on If you use literals (constants) in the query, then each and every query is a brand-new query, never before seen by the database It will have to be parsed, qualified (names resolved), security checked, optimized, and so on in short, each and every unique statement you execute will have to be compiled every time it is executed The second query uses a bind variable, :empno, the value of which is supplied at query execution time.

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An Oracle cursor is a handle to an area in memory that holds the result set of a SQL query, enabling you to individually process the rows in the result set. Oracle uses implicit cursors for all DML statements. Explicit cursors are created and used by application coders.

This is generally considered the most restrictive level of transaction isolation, but it provides the highest degree of isolation. A SERIALIZABLE transaction operates in an environment that makes it appear as if there are no other users modifying data in the database. Any row we read is assured to be the same upon a reread, and any query we execute is guaranteed to return the same results for the life of a transaction. For example, if we execute Select * from T; Begin dbms_lock.sleep( 60*60*24 ); end; Select * from T; the answers returned from T would be the same, even though we just slept for 24 hours (or we might get an ORA-01555, snapshot too old error, which is discussed in 8). The isolation level SERIALIZABLE assures us these two queries will always return the same results. Side effects (changes) made by other transactions are not visible to the query regardless of how long it has been running. In Oracle, a SERIALIZABLE transaction is implemented so that the read consistency we normally get at the statement level is extended to the transaction.

Implicit cursors are automatically used by Oracle every time you use a SELECT statement in PL/SQL. You can use implicit cursors in statements that return just one row. If your SQL statement returns more than one row, an error will result. In the following PL/SQL code block, the SELECT statement makes use of an implicit cursor: DECLARE emp_name varchar2(40); salary float; BEGIN SELECT emp_name, salary FROM employees WHERE employee_id=9999; dbms_output.put_line('employee_name : '||emp_name||' salary :'||salary); END; /

This query is compiled once, and then the query plan is stored in a shared pool (the library cache), from which it can be retrieved and reused The difference between the two in terms of performance and scalability is huge dramatic, even From the previous description, it should be fairly obvious that parsing a statement with hard-coded variables (called a hard parse) will take longer and consume many more resources than reusing an already parsed query plan (called a soft parse) What may not be so obvious is the extent to which the former will reduce the number of users your system can support This is due in part to the increased resource consumption, but an even larger factor arises due to the latching mechanisms for the library cache.

ONLY. It has all of the qualities of the SERIALIZABLE isolation level, but it prohibits modifications. It should be noted that the SYS user (or users connected as SYSDBA) can t have a READ ONLY or SERIALIZABLE transaction. SYS is special in this regard.

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