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So the record that was Y=5 when you began the UPDATE is no longer Y=5 The consistent read component of the UPDATE says, You want to update this record because Y was 5 when we began, but the current version of the block makes you think, Oh, no, I can t update this row because Y isn t 5 anymore It would be wrong If we just skipped this record at this point and ignored it, then we would have a nondeterministic update It would be throwing data consistency and integrity out the window The outcome of the update (how many and which rows were modified) would depend on the order in which rows got hit in the table and what other activity just happened to be going on.

Often, you ll need to use nonexecutable comments in your SQL*Plus scripts and reports. Here s a brief description of the commenting features available in SQL*Plus: The /* . . . */ delimiters: You can enclose one or more lines in your script with these delimiters to indicate that those lines are comments. The -- notation: You can preface the lines you want commented by a pair of hyphens. Developers often use these at the end of a code line to place comments. The REMARK (or just REM) command: The REMARK command before the beginning of a line indicates that the line is not to be executed.

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As an example, we will investigate what might happen with a set of statements like this: insert into t (x,y) values (1,1); update t set x = x+1 where x = 1; delete from t where x = 2; We will follow this transaction down different paths and discover the answers to the following questions: What happens if the system fails at various points in the processing of these statements What happens if we ROLLBACK at any point What happens if we succeed and COMMIT

SQL*Plus stores your most recently issued SQL statement in an area of memory called the SQL buffer. Unfortunately, SQL*Plus lets you save only the last command you issued in the buffer. Every new statement that you enter replaces the previous statement in the buffer. If you want to see the previous command you issued, type the word LIST or just the letter l. SQL> 1 2 3* SQL> l SELECT username, status, process, sid, serial# FROM v$session WHERE status = 'ACTIVE'

You could take the same exact set of rows and in two different databases, each one running the transactions in exactly the same mix, you could observe different results, just because the rows were in different places on the disk In this case, Oracle will choose to restart the update When the row that was Y=5 when you started is found to contain the value Y=10, Oracle will silently roll back your update (just the update, not any other part of the transaction) and restart it, assuming you are using READ COMMITTED isolation If you are using SERIALIZABLE isolation, then at this point you would receive an ORA-08177: can't serialize access for this transaction error In READ COMMITTED mode, after the transaction rolls back your update, the database will restart the update (ie.

If you want to see what s in your SQL script before you execute it, load it from the operating system into the SQL buffer by using the GET command, as follows: SQL> 1 2 3* SQL> GET status.sql SELECT username,status,process,sid,serial# FROM v$session WHERE status = 'ACTIVE'

The initial INSERT INTO T statement will generate both redo and undo. The undo generated will be enough information to make the INSERT go away. The redo generated by the INSERT INTO T will be enough information to make the insert happen again. After the insert has occurred, we have the scenario illustrated in Figure 9-1.

Caution If you just enter the slash (/) command in your SQL*Plus session, you ll execute the last command you entered, which is always stored in the SQL buffer. It s a very good idea to always use the LIST command to first see what you re actually executing.

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