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It could be that you are restarting queries you never used in the past Or the addition of a tiny program that updates just a single row here and there makes a batch process that used to run in an hour suddenly run in many hours due to restarts that never used to take place This is not a new feature of Oracle it has been in the database since version 40, when read consistency was introduced I myself was not totally aware of how it worked until the summer of 2003 and, after I discovered what it implied, I was able to answer a lot of How could that have happened questions from my own past It has made me swear off using autonomous transactions in triggers almost entirely, and it has made me rethink the way some of my applications have been implemented.

import java.sql.*; import oracle.jdbc.OracleDriver; import java.util.Date; public class perftest { public static void main (String arr[]) throws Exception { DriverManager.registerDriver(new oracle.jdbc.OracleDriver()); Connection con = DriverManager.getConnection ("jdbc:oracle:thin:@localhost.localdomain:1521:ora10g", "scott", "tiger"); Integer iters = new Integer(arr[0]); Integer commitCnt = new Integer(arr[1]); con.setAutoCommit(false); doInserts( con, 1, 1 ); doInserts( con, iters.intValue(), commitCnt.intValue() ); doInserts( con, iters.intValue(), iters.intValue() ); con.commit(); con.close(); } Now, the method doInserts() is fairly straightforward. It starts by preparing (parsing) an INSERT statement so we can repeatedly bind/execute it over and over: static void doInserts(Connection con, int count, int commitCount ) throws Exception { PreparedStatement ps = con.prepareStatement ("insert into test " + "(id, code, descr, insert_user, insert_date)" + " values ( , , , user, sysdate)"); It then loops over the number of rows to insert, binding and executing the INSERT over and over. Additionally, it is checking a row counter to see if it needs to COMMIT or not inside the loop. Note also that before and after the loop we are retrieving the time, so we can monitor elapsed times and report them: int rowcnt = 0; int committed = 0; long start = new Date().getTime(); for (int i = 0; i < count; i++ ) { ps.setInt(1,i); ps.setString(2,"PS - code" + i); ps.setString(3,"PS - desc" + i); ps.executeUpdate();

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Some small entities adopt Windows as an operating system, as it isn t quite as complex to manage as the UNIX operating system Although the system administrators usually are very helpful, it s in your best interest to acquire as much skill in this field as you can This will help you in more ways than you can imagine It will help you in working effectively with the UNIX administrator, because you can both speak the same language when it comes to fancy topics such as the logical volume manager and subnet masks More important, a good understanding of the UNIX disk structure will help you make the proper choice of disks when you design the physical layout of your database By understanding concepts such as UNIX disk volumes and the usage of system memory, you can improve the performance of your databases and avoid bottlenecks that slow databases down.

For example, I ll never send e-mail from a trigger directly; rather, I ll always use DBMS_JOB or something similar to send the e-mail after my transaction commits This makes the sending of the e-mail transactional; that is, if the statement that caused the trigger to fire and send the e-mail is restarted, the rollback it performs will roll back the DBMS_JOB request Most everything nontransactional that I did in triggers was modified to be done in a job after the fact, making it all transactionally consistent..

You can also write excellent monitoring scripts by being well steeped in the UNIX shell scripting and the related awk and sed programming languages..

rowcnt++; if ( rowcnt == commitCount ) { concommit(); rowcnt = 0; committed++; } } concommit(); long end = new Date()getTime(); Systemout.

You can issue a DDL command, such as DROP INDEX, that will also automatically ensure that any pending transaction is followed with either a COMMIT or ROLLBACK statement. You can exit gracefully from SQL*Plus by typing in EXIT or QUIT, which are identical in their effects. When you issue the EXIT command, Oracle will automatically commit all changes you made in that session, even if you never issued a commit request, or even if the AUTOCOMMIT setting has been set to OFF. When you use either the EXIT or QUIT command, the following will happen: All pending changes are rolled back or committed. The user is logged out of Oracle. The SQL*Plus session is terminated. Control is returned to the operating system.

Summary

When you embed SQL*Plus in program scripts, you can use the MARKUP command in the following way to produce HTML output: SQLPLUS -MARKUP "HTML ON" Before executing any SQL commands, this command outputs the HTML and BODY tags. If you want to output an HTML page that can be embedded in an existing web page, you can use the MARKUP command as follows: SQL> SET MARKUP HTML ON SPOOL ON SQL> commands here . . . SQL> SET MARKUP HTML OFF SPOOL OFF

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