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The previous query doesn t reveal any significant contention for resources all the waits are for idle events. If your database is performing an extremely high number of updates, contention for resources such as undo segments and latches could potentially be a major source of database-wide slowdowns, making it seem sometimes like the database is hanging. In the early part of this chapter, you learned how to analyze database contention and wait issues using the V$SESSION_WAIT view and the AWR output. On Windows servers, you can use the Performance Monitor and Event Monitor to locate possible high resource usage. Check for excessive library cache contention if you re confronted by a database-wide slowdown.



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We do not think it makes sense to put security sufficient for version five of your software in the alpha version. Certainly, you may have trouble predicting what the threats to version five of your software will be, because you may have more and different users, and your software may even be deployed in a different environment (i.e., operating system). Also, even though you design security into the alpha version based on your estimation of the expected threats, you might find that attackers find unusual ways to exploit your alpha version. As Fred Brooks says, plan to throw the first version, your alpha version, away. Then, design the beta version, again with security in mind from the beginning to deal with the threats that you anticipated in the alpha, as well as the unusual threats that you learned about once you tested and deployed the alpha (Brooks 1995). So, the message is: design it with security in mind. Design it so that your alpha version is secure enough. Have a discussion with a security person even before you design the alpha to make sure that your design is reasonable and will not preclude your ability to strengthen your software against attacks in the future. Design so that there is enough flexibility for you to build a secure beta version if the alpha version is successful.





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If a major table or tables are locked unbeknownst to you, the database could slow down dramatically in short order. Try running a command such as SELECT * FROM persons, for example, where persons is your largest table and is part of just about every SQL statement. If you aren t sure which tables (if any) might be locked, you can run the following statement to identify the table or index that s being locked, leading to a slow database: SQL> 2 3 4 5 6* SELECT l.object_id, l.session_id, l.oracle_username, l.locked_mode, o.object_name FROM V$LOCKED_OBJECT l, DBA_OBJECTS o WHERE o.object_id=l.object_id; SESSION_ID ---------22 ORACLE_USERNAME --------------NICHOLAS LOCKED_MODE ----------6 OBJECT_NAME ----------EMPLOYEES

Figure 8-25. Use the Subselection tool to treat the path as a vector line. Not only can you reshape the motion path, but you can also move it, rotate, skew it, and treat it like any other shape or object on the stage. Let s keep experimenting.

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As the preceding query and its output show, user Nicholas has locked up the Employees table. If this is preventing other users from accessing the table, you have to remove the lock quickly by killing the locking user s session. You can get the locking user s SID from the session_id column in the preceding output, and the V$SESSION view gives you the SERIAL# that goes with it. Using the ALTER SYSTEM KILL . . . command, you can then kill the offending session. The same analysis applies to a locked index, which prevents users from using the base table. For example, an attempt to create an index or rebuild it when users are accessing the table can end up inadvertently locking up the table. If there s a table or index corruption, that could cause a problem with accessing that object(s). You can quickly check for corruption by running the following statement:

On occasion, there might be a problem because of an alarming increase in the size of one or more Oracle processes. You have to be cautious in measuring Oracle process size, because traditional UNIX-based tools can give you a misleading idea about process size. The following sections explain how to measure Oracle process memory usage accurately.

panel. Twirl down the Path options. Scrub across the X, Y, W, and H values, and you will see that you can move and resize the path. Impressed Hang on it gets better.

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