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Is Oracle the Problem
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Just because your database users are complaining, you shouldn t be in a hurry to conclude that the problem lies within the database. After all, the database doesn t work in a vacuum it runs on the server and is subject to the resource constraints and bottlenecks of that server. If the non-Oracle users on the server are using up critical resources such as CPU processing and disk I/O, your database may be the victim of circumstances, and you need to look for answers outside the database. That s why it s critical that DBAs understand how to measure general system performance, including memory, the disk storage subsystem, the network, and the processors. In the following sections you ll take a look at the system resources you should focus on.
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Is the Network Okay
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One of the first things you need to do when you re investigating slowdowns is to rule out networkrelated problems. Quite often, users complain of being unable to connect to the system, or being abruptly disconnected from the system. Check your round-trip ping times and the number of collisions. Your network administrator should check the Internet connections and routers. On the Oracle end, you can check the following dynamic views to find out if there s a slowdown due to a network problem. The V$SESSION_EVENT view shows the average amount of time Oracle waits between messages in the average wait column. The V$SESSION_WAIT view, as you ve seen, shows what a session is waiting for, and you can see whether waits for network message transport are higher than normal. If the time for SQL round-trips is extremely long, it could reflect itself as a high amount of networkrelated wait time in the V$ views. Check to see whether your ping time for network round-trips has gone up appreciably. You should discuss with your network administrator what you can do to decrease the waits for network traffic. You may explore the possibility of setting the parameter TCP,NODELAY=TRUE in your sqlnet.ora file. This results in TCP sending packets without waiting, thus increasing response time for real-time applications. If the network seems like one of your constant bottlenecks, you may want to investigate the possibility of using the shared server approach instead of the dedicated server approach for connecting users to your database. By using a shared server and its connection pooling feature, you can reduce the number of physical network connections and thus help your application scale more efficiently to large user bases.
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Is the System CPU Bound
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Check the CPU performance to make sure a runaway process or a valid Oracle process isn t hogging one or more processes and contributing to the system slowdown. Often, killing the runaway processes or the resource-hogging sessions will bring matters to a more even keel. Using the OEM Database Control, you can get a quick idea about the breakdown of CPU usage among parse, recursive, and other usage components. Normally, you should expect to see no more than 20 to 25 percent of total CPU usage by the system itself, and about 60 to 65 percent usage by the Oracle application. If the system usage is close to 50 percent, it s an indication that there are too many system calls, for example, which leads to excessive use of the processors. As you learned earlier in this chapter, the V$SESSTAT view shows CPU usage by session. Using the following query, you can find out the top CPU-using Oracle sessions. You may want to look into the actual SQL that these sessions are executing.
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CHAPTER 20 PERFOR MAN CE TUNING: TUNING THE INSTA NCE
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SQL> SELECT a.sid,a.username, s.sql_text FROM V$SESSION a, V$SQLTEXT s WHERE a.sql_address = s.address AND a.sql_hash_value = s.hash_value AND a.username = '&USERNAME' AND A.STATUS='ACTIVE' ORDER BY a.username,a.sid,s.piece;
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