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The error logging table contains the following information about errors that it logs: Username Time of the error Name of the script, if there is one An identifier defined by the user The error message The statement that resulted in the error Error logging isn t enabled by default, as shown here: SQL> show errorlogging errorlogging is OFF SQL> To set error logging on, issue the following command in SQL*Plus: SQL> set errorlogging on; Once you turn error logging on, confirm that by issuing the following command: SQ> connect hr/hr Connected. SQL> show errorlogging errorlogging is ON TABLE HR.SPERRORLOG SQL> Notice that the database not only confirms that error logging is turned on, but also shows the table (hr.sperrorlog) that ll store the error messages. The database grants ownership of the error logging table to the user who turns error logging on. In this case, the user is HR. Once you turn error logging on as shown here, you can query the error logging table to check the error messages and other information connected to an erroneous SQL or PL/SQL statement. Here s an example: SQL> select username,statement,message from sperrorlog; USERNAME --------HR HR STATEMENT --------------------------create table employees as select * from employees select names from employees MESSAGE -------------------------ORA-00955: name is already used by an existing object ORA-00904: "NAMES": invalid identifier



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SQL> The first error message shows that the create table statement issued by the user HR failed because there s already a table with the name EMPLOYEES. The second error message shows that a SELECT statement errored out because it was referring to a nonexistent column in the EMPLOYEES table. As you can see, the error logging table can be very useful when you re troubleshooting SQL and PL/SQL code errors.

shown in Figure 1-26. Click the medium gray on the left (#999999), and the stage will turn gray. You have just changed the color property of the stage.





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Let s say you encounter a situation where one of your key nightly batch jobs is running past its time window and continuing on into the daytime, where it s going to hurt the online OLTP performance. You know the batch job used to finish within the stipulated time, but now it s tending to take a much longer time. As of Oracle Database 10g Release 2, you can use the Database Control s Compare Periods Report to compare the changes in key database metrics between two time intervals. As you know, an AWR snapshot captures information between two points in time. However, you can use the Time Periods Comparison feature to examine the difference in database metrics between two different time intervals or periods, by analyzing performance statistics captured by two sets of AWR snapshots. If your nightly batch job ran just fine on Tuesday but was slow on Wednesday, you can find out why, using the Compare Periods Report. To use the Compare Periods Report, use the following steps: 1. In the Database Control home page, click the Performance tab. 2. Under the Additional Monitoring Links group, click the Snapshots link. 3. In the drop-down list for Actions, select Compare Periods and click Go. 4. The Compare Periods: First Period End page appears. You must select the start time for the comparison analysis by selecting an ending snapshot ID for the first period. You may also choose a time period, if you wish, instead of the ending snapshot ID. Click Next. 5. The Compare Periods: Second Period Start page is next. You must select a snapshot ID to mark the beginning of the second period. Click Next.

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As a result, by issuing such a GET request, the attacker would be able to traverse up the directory tree to the root directory, and then access a file such as /etc/shadow, which, on UNIX, contains a list of all usernames and encrypted versions of their passwords Even though the passwords are encrypted, an attacker may then attempt to mount a dictionary attack against the password file, especially if the password system was not designed well We will cover dictionary attacks and how to build good password systems in 9 To prevent this attack, you need to canonicalize and validate the pathname that the client specifies in the GET request Writing such code can often be tricky business.

6. The Compare Periods: Second Period End page is next. You select the ending snapshot for the second period on this page and click Next. 7. The Compare Periods: Review page is next, as shown in Figure 20-9. It shows the first period and second period beginning and ending snapshot IDs. After confirming that the first and second period ranges are correct, click Finish.

Figure 1-27, that can be changed. Click the color chip to open the Color Picker. When it opens, click the white chip once. The text turns white.

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