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Also, as they are reused over time, when the buffer cache is effectively full, and some block with a small touch count is freed, it will be placed back into approximately the middle of the list with the new data block The whole algorithm used to manage these lists is fairly complex and changes subtly from release to release of Oracle as improvements are made The actual full details are not relevant to us as developers, beyond the fact that heavily used blocks will be cached, and blocks that are not used heavily will not be cached for long..

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Figure 22-6. The Top Activity page of the Database Control If you suspect that an individual session is wait bound or you get complaints from particular users that their sessions are running slowly, you can examine the Top Sessions page. You can go the Top Sessions page by clicking the Top Sessions link under the Additional Monitoring Links group on the Performance page. Once you get to the Top Sessions page, click the username and SID you re interested in. That takes you to the Session Details page for that session. By clicking the Wait Event History tab in the Session Details page, you can see the nature of the recent waits for that session. Figure 22-7 shows the Wait Event History for a session.

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You can get to the Performance Data Report page by clicking the Create ASH Report button in the Average Active Sessions screen on the Database Control s Performance home page. The AWR reports are good for analyzing instance performance, but they re usually collected at 30 minute or 1 hour intervals. What if you have a three-to-four minute performance spike that s not shown in the aggregated AWR report ASH reports focus on session-sampling data over a recent period of time. When you click the Create ASH Report button, you re given a choice as to the time period over which you want to create your ASH report. You can choose a time period that lies within the last seven days, because that s how long the AWR saves its statistics. Remember that ASH statistics are saved in the AWR repository. Figure 22-8 shows the ASH report, which relies on the V$ACTIVE_ SESSION_HISTORY view. This is the same ASH report that you can produce by running the ashrpt.sql script. It contains information about the following items: Top Events Load Profile Top SQL Top Sessions, including Top Blocking Sessions Other entities causing contention in the instance, including Top Database Objects, Top Database Files, and Top Latches Activity Over Time

Starting in Oracle9i, you can have multiple database blocksizes in the same database. Previously, all blocks in a single database were the same size and in order to have a different blocksize, you had to rebuild the entire database. Now you can have a mixture of the default blocksize (the blocksize you used when you initially created the database; the size that is used for the SYSTEM and all TEMPORARY tablespaces) and up to four other blocksizes. Each unique blocksize must have its own buffer cache area. The Default, Keep, and Recycle pools will only cache blocks of the default size. In order to have nondefault blocksizes in your database, you will need to have configured a buffer pool to hold them. In this example, my default blocksize is 8KB. I will attempt to create a tablespace with a 16KB blocksize: ops$tkyte@ORA10G> create tablespace ts_16k 2 datafile size 5m 3 blocksize 16k; create tablespace ts_16k * ERROR at line 1: ORA-29339: tablespace blocksize 16384 does not match configured blocksizes ops$tkyte@ORA10G> show parameter 16k NAME TYPE VALUE ------------------------------------ ----------- -----------------------------db_16k_cache_size big integer 0 Right now, since I have not configured a 16KB cache, I cannot create such a tablespace. I could do one of a couple things right now to rectify this situation. I could set the DB_16K_ CACHE_SIZE parameter and restart the database. I could shrink one of my other SGA components in order to make room for a 16KB cache in the existing SGA. Or, I might be able to just allocate a 16KB cache if the SGA_MAX_SIZE parameter was larger than my current SGA size.

You can use the V$SQL view, as shown in the following example, to find out which of the SQL statements in the instance are taking the most time to finish and are the most resource intensive. The

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