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Edit PDF files for free with our online PDF editor ! You can add text, images, and signatures, white-out and highlight content, and more. 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. easy pdf text editor online free: PDFzorro | edit pdf -files online edit pdf title online pyroPDF | edit pdf -files online
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Free online PDF editor that allows you to draw onto your PDF files, add text, highlight passages and add watermarks. Edit your PDF online and for free. 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$SESSTAT view shows CPU usage by session. Using the following query, you can find out the top CPU-using Oracle sessions. You may want to look into the actual SQL that these sessions are executing. 8-29). SQL> SELECT a.sid,a.username, s.sql_text FROM V$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; pdf metadata editor online The best free PDF editor 2019 | TechRadar
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