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As we discussed in the previous chapter, many developers artificially constrain the size of their transactions, committing every so many rows, instead of committing when a logical unit of work has been performed They do this in the mistaken belief that they are preserving scarce system resources, when in fact they are increasing them If a COMMIT of one row takes X units of time, and the COMMIT of 1,000 rows takes the same X units of time, then performing work in a manner that does 1,000 one-row COMMITs will take an additional 1,000*X units of time to perform By committing only when you have to (when the logical unit of work is complete), you will not only increase performance, but also reduce contention for shared resources (log files, various internal latches, and the like) A simple example demonstrates that it necessarily takes longer.

Listing 4-19 shows how to use the COPY command. Note that the hyphen (-) is the continue character, and it lets you break up long SQL statements over multiple lines. Make sure you use the continue character and don t hit Enter after the first line! Listing 4-19. Using the COPY Command SQL> COPY FROM sysadm/sysadm1@finance1> CREATE test01 > USING SELECT * FROM employee; Array fetch/bind size is 15. (arraysize is 15) Will commit when done. (copycommit is 0) Maximum long size is 80. (long is 80) Table TEST01 created. 4954 rows selected from sysadm@finance1 4954 rows inserted into TEST01. 4954 rows committed into TEST01 at DEFAULT HOST connection. SQL> You can make the COPY command s execution faster by increasing the size of the SQL*Plus parameters ARRAYSIZE, COPYCOMMIT, and LONG, if necessary. Using the CREATE TABLE AS SELECT method is usually faster than using the COPY command when you re copying data from one table to another on the same server using the COPY command involves copying data from the server to the client SQL*Plus interface before copying it back to the database again. Obviously this will increase the overhead and take longer to process than directly copying from the server to the same server.

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The first thing that pops out should be Our trigger fired twice! We had a one-row table with a BEFORE FOR EACH ROW trigger on it. We updated one row, yet the trigger fired two times. Think of the potential implications of this. If you have a trigger that does anything nontransactional, this could be a fairly serious issue. For example, consider a trigger that sends an update where the body of the e-mail is This is what the data used to look like. It has been modified to look like this now. If you sent the e-mail directly from the trigger, using UTL_SMTP in Oracle9i or UTL_MAIL in Oracle 10g and above, then the user would receive two e-mails, with one of them reporting an update that never actually happened. Anything you do in a trigger that is nontransactional will be impacted by a restart. Consider the following implications: Consider a trigger that maintains some PL/SQL global variables, such as for the number of rows processed. When a statement that restarts rolls back, the modifications to PL/SQL variables won t roll back.

When you use SQL*Plus, you can enter DML statements either separately or as part of a named or an anonymous block of PL/SQL code. Here are the different ways in which DML changes are made permanent: You can commit the results of a transaction by using the COMMIT keyword at the end of the transaction. You can set the AUTOCOMMIT setting to ON in your SQL*Plus session, which results in an automatic COMMIT statement being appended to every SQL statement you issue in that session.

Virtually any function that starts with UTL_ (UTL_FILE, UTL_HTTP, UTL_SMTP, and so on) should be considered susceptible to a statement restart. When the statement restarts, UTL_FILE won t un-write to the file it was writing to. Any trigger that is part of an autonomous transaction must be suspect. When the statement restarts and rolls back, the autonomous transaction can t be rolled back.

We ll use a Java application, although you should expect similar results from most any client except, in this case, PL/SQL (we ll discuss why that is after the example) To start, here is the sample table we ll be inserting into: scott@ORA10G> desc test Name Null ----------------- -------ID CODE DESCR INSERT_USER INSERT_DATE Type -----------NUMBER VARCHAR2(20) VARCHAR2(20) VARCHAR2(30) DATE.

OCA: The Oracle Certification Program begins with the Associate level. At this apprentice skill level, Oracle Associates have a foundation knowledge that will allow them to act as junior team members working with database administrators or application developers. The two exams you are required to take expect knowledge of basic database administration tasks and an understanding of the Oracle database architecture and how its components work and interact with one another. The OCA is also a prerequisite to becoming an OCP. OCP: The exam ensures that the OCP with the 11g credential can competently address critical database functions, such as manageability, performance, reliability, security, and availability using the latest Oracle technology. The OCP is a prerequisite to becoming an Oracle Certified Master.

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