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CHAPTER 4 TRANSACTIONS
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The procedure _doInsertCommitOutsideLoop() does the same thing, except the commit is outside the loop (shown in bold): private static void _doInsertCommitOutsideLoop( Connection conn ) throws SQLException { String stmtString = "insert into t1( x ) values ( )"; PreparedStatement pstmt = null; try { pstmt = conn.prepareStatement( stmtString ); for( int i=0; i < NUM_OF_RECORDS; i++ ) { pstmt.setInt( 1, 1 ); pstmt.executeUpdate(); } conn.commit(); } finally { JDBCUtil.close( pstmt ); } } private static final int NUM_OF_RECORDS = 10000; } Note that the PreparedStatement interface just used is covered in more detail in 5. When we run the program BenchmarkIntermittentCommits, we get the following output: B:\>java BenchmarkIntermittentCommits URL:jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp) (PORT=1521)(HOST=rmenon-lap))(CONNECT_DATA=(SID=ora10g))) ------- Benchmark Results -------Results from RUNSTATS utility Run1 ran in 1300 hsecs Run2 ran in 363 hsecs run 1 ran in 358.13% of the time Name STAT...commit txn count during <- trimmed to conserve space -> STAT...redo size Run1 Run2 0 Diff 1 2,462,672 1 -2,898,876
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5,361,548
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CHAPTER 4 TRANSACTIONS
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Run1 latches total versus runs -- difference and pct Run1 Run2 Diff Pct 585,190 126,639 -458,551 462.09%
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Runtime Execution Time Differences as seen by the client Run1 ran in 1318 hsecs Run2 ran in 365 hsecs Run1 ran in 361% of the time As you can see, the method _doInsertCommitInLoop() took around 360% of the time and consumed approximately 460% of latches as compared to the method _doInsertCommitOutsideLoop(). From the previous discussion, we can conclude that in Oracle we should issue commits based on our transaction needs, not based on the amount of resources (such as disk space) that would be consumed. This is because issuing intermittent commits in the misguided attempt to save resources leads to compromised data integrity, an overall increase in resource consumption, and more complex and bug-ridden code that runs slowly and does not scale. Thus, we should adjust the Oracle resources consumed in a transaction according to our transaction needs (which, in turn, are based on business requirements), not the other way around. Of course, we should strive to use all Oracle resources optimally.
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Note Splitting a transaction seems to be a common (and possibly sound) performance optimization
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technique in many other databases, such as Microsoft SQL Server, since these databases have a large transaction overhead. Note, however, that even for these databases, other disadvantages such as compromised data integrity and increased code complexity still remain. Oracle was designed from the ground up to deal with large transactions and, as we ve seen in this section, using this technique in Oracle isn t required and isn t a good idea.
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The Autocommit Feature and Turning It Off
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In JDBC, when we obtain a connection, by default it is in autocommit mode. This means that a commit is automatically issued after every SQL statement has been successfully executed. In other words, every SQL statement we issue is treated as a separate transaction. From the discussion in the previous section, you should know why this is not a good idea. Thus, after getting a connection, we should always turn this feature off by invoking the setAutoCommit() method on the Connection object, as highlighted in the following code snippet: Connection connection = null; try {
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CHAPTER 4 TRANSACTIONS
// ods is an initialized OracleDataSource object elsewhere connection = ods.getConnection(); connection.setAutoCommit( false ); . . . } . . . In fact, we do this in the getConnection() method in the JDBCUtil class. One implication of turning off autocommit is that if we have made any changes, we need to explicitly commit them in case of success or roll them back in case of error (since we would be turning off the autocommit feature). The commit and rollback methods could throw a SQLException, though this is a rare situation and cannot typically be handled by the application. Note that when autocommit is off, and a connection is closed without a commit or a rollback, an implicit commit is issued by Oracle, thus committing any uncommitted changes.
Note There is an inconsistency in the Oracle JDBC driver (including the 10g driver) wherein if you commit once (with autocommit off), execute some other DMLs, and then forget to commit, the DMLs are rolled back (as opposed to being implicitly committed as the document Oracle Database JDBC Developer s Guide and Reference states).
However, we should always explicitly commit or roll back our transactions, since the default action may not be what we desire. Typically, we commit at the end of the transaction and roll back if there is an exception before reaching the commit statement in our program.
Turn off the JDBC autocommit feature right after you obtain a connection in your JDBC application Tip
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