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You can view the Performance page in the default mode, which is called the SQL Access Mode, or the new Memory Access Mode. The SQL Access Mode works through SQL statements that mostly query the V$ dynamic performance view to obtain instance performance data. However, when the database is running painfully slowly, or is completely hung, running in the SQL Access Mode puts further stress due to the additional parsing and execution load of the SQL statements run by the OEM interface to diagnose instance performance. If your instance is already facing heavy library cache contention, your attempt to diagnose the problem will exacerbate the situation. Oracle recommends that you switch to the Memory Access Mode while diagnosing slow or hung systems. Under this mode, the database gets its diagnostic information straight from the SGA, using more lightweight system calls than the resource-intensive SQL statements that are employed during the default SQL Access Mode. Because the data is sampled more frequently under the Memory Access Mode, you re less likely to miss events that span short intervals of time as well. Figure 22-4 shows how to use the drop-down window to switch between the Memory Access Mode and the SQL Access Mode.

sys@ORA9IR2> / TCH FILE# DBABLK D ---------- ---------- ---------- 2 1 1617 X 0 1 1618 X sys@ORA9IR2> exec dbms_locksleep(32); PL/SQL procedure successfully completed sys@ORA9IR2> / TCH FILE# DBABLK D ---------- ---------- ---------- 3 1 1617 X 0 1 1618 X sys@ORA9IR2> exec dbms_locksleep(32); PL/SQL procedure successfully completed sys@ORA9IR2> / TCH FILE# DBABLK D ---------- ---------- ---------- 4 1 1617 X 0 1 1618 X I expect output to vary by Oracle release you may well see more than two rows returned You might observe TCH not getting incremented every time On a multiuser system, the results will be even more unpredictable Oracle will attempt to increment the TCH once every three seconds (there is a TIM column that shows the last update time to the TCH column), but it is not considered important that the number be 100 percent accurate, as it is close.

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Figure 22-4. Using the Performance page in the Memory Access Mode The following sections describe the main charts you ll see on the Database Performance page.

The Host chart indicates if there is a CPU bottleneck. If the number of users is low while the Host section shows a high run-queue length, it means that the database users may not be the main contributing factor for high CPU consumption. Look at what else may be running on your system and consuming the CPU resources.

Create()

Also, Oracle will intentionally cool blocks and decrement the TCH count over time So, if you run this query on your system, be prepared to see potentially different results So, in Oracle8i and above, a block buffer no longer moves to the head of the list as it used to; rather, it stays where it is in the list and has its touch count incremented Blocks will naturally tend to move in the list over time, however I put the word move in quotes because the block doesn t physically move; rather, multiple lists are maintained that point to the blocks and the block will move from list to list For example, modified blocks are pointed to by a dirty list (to be written to disk by DBWn).

The Average Active Sessions chart shows performance problems within your instance, by focusing on the wait events in your instance. This is the key chart in the Performance page and should be the starting point of a performance analysis using the OEM. Figure 22-5 shows the Average Active Sessions chart. The chart shows you which of the active sessions are waiting on CPU and which are waiting on an event. The Average Active Sessions chart is color coded for your benefit. Green represents users on the CPU and the other colors show users waiting on various events such as disk I/O, locks, or network communications. Here s how you can tell if you have too many waits in your instance: if the level of waits is twice the Max CPU line, you have too many waits, and should look at tuning the instance. To the right of the Average Active Sessions screen, you can see the breakdown of the components that contribute to session time. For example, if you see user I/O as the main culprit for high waits, you can click this component to find out details about the wait. Figure 22-5 also shows the buttons you can click to run the ADDM or get an ASH report.

Figure 22-5. The Average Active Sessions page of the Database Control You can also click the link for Top Activity to find out details about the sessions that are most responsible for waits in your instance right now. Figure 22-6 shows the Top Activity page of the Database Control. Database activity is ranked into Top SQL and Top Sessions. You can run the SQL Tuning Advisor from here to get tuning recommendations about the top SQL statements.

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