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It can sometimes be downright chaotic when things come to a standstill in the database. You might be swamped with phone calls and anxious visitors to your office who are wondering why things are slow. Oftentimes, especially when serious unknown locking issues are holding up database activity, it s tempting just to bounce the database because usually that clears up the problem. Unfortunately, you don t know what caused the problem, so when it happens again, you re still just as ignorant as you were the first time. Bouncing the database also means that you re disconnecting all active users, which may not always be a smart strategy. It s important that you collect some information quickly for two reasons. First, you might be able to prevent the problem next time or have someone in Oracle tech support (or a private firm) diagnose the problem using their specialized tools and expertise in these matters. Second, most likely a quick shutdown and restart of the database will fix the problem for sure (as in the case of some locking situations, for example). But a database bounce is too mighty a weapon to bring to bear on every similar situation. If you diagnose the problem correctly, simple measures may prevent the problem or help you fix it when it does occur. The following sections describe what you need to do to collect information on a slow or hanging database.

These segments blocks could get flushed from the cache to make room for some blocks you used infrequently (the do not care to cache blocks) To keep these warm segments blocks cached, you could do one of the following: Assign these segments to the Keep pool, in an attempt to let the warm blocks stay in the buffer cache longer Assign the do not care to cache segments to the Recycle pool, keeping the Recycle pool fairly small so as to let the blocks come into the cache and leave the cache rapidly (decrease the overhead of managing them all) This increased the management work the DBA had to perform, as there were three caches to think about, size, and assign objects to.

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Messages that create objects are connected to the object s top box instead of the vertical lifeline. You can put a gray box over certain sections of a lifeline to indicate which object is active at a given time. The box is called the focus of control. A large X at the end of the lifeline denotes the destruction of an object. Figure 6-11 shows a Sequence diagram in which an object is created, activated for a short operation, and then destroyed.

You can use OEM s Database Control during an instance slowdown to see a color-coded view of all sessions in the database. The Hang Analysis page provides the following information: Instantaneously blocked sessions Sessions in a prolonged wait state Sessions that are hung Figure 22-1 shows the Database Control Hang Analysis page, which you can access from the Performance page. Click the Hang Analysis link under the Additional Monitoring Links section.

The first thing you do when you find out the database suddenly slowed down or is hanging is to look in some of the log files where Oracle might have sent a message. Quickly look in the alert log file to see if there are any Oracle error messages or any other information that could pinpoint any problems. You can check the background dump directory (bdump) for any other trace files with error messages in them. I summarize these areas in the following discussion.

Remember also that there is no sharing between them, so if the Keep pool has lots of unused space, it won t give it to the overworked Default or Recycle pool All in all, these pools were generally regarded as a very fine, low-level tuning.

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