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You saw the V$ROWCACHE view in 22 as part of the discussion of the data dictionary cache. The row cache, also known as the dictionary cache, captures all data dictionary activity. 22 also includes a formula for computing the data-dictionary hit ratio, which indicates if the sizing of the row cache is appropriate for your instance.

You don t have to allocate all the buffer cache memory to a single pool As 10 showed you, you can use three separate pools: the keep buffer pool, the recycle buffer pool, and the default buffer pool Although you don t have to use the keep and default buffer pools, it s a good idea to configure all three pools so you can assign objects to them based on their access patterns In general, you follow these rules of thumb when you use the multiple buffer pools: Use the recycle cache for large objects that are infrequently accessed You don t want these objects to occupy a large amount of space unnecessarily in the default pool Use the keep cache for small objects that you want in memory at all times Oracle automatically uses the default pool for all objects not assigned to either the recycle or keep cache.

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The V$DB_OBJECT_CACHE view lets you see all objects (such as tables, procedures, triggers, packages, and so on), that are cached in the library cache. This is a highly useful view that indicates, for example, if an object is being reloaded multiple times because it can t be cached in the shared pool. The script shown in Listing 23-27 illustrates how you can get information on the number of executions, and whether an object is kept in the shared pool. Listing 23-27. Using the V$DB_OBJECT_CACHE View SQL> SELECT name, executions, sharable_mem, kept FROM V$DB_OBJECT_CACHE WHERE type='PACKAGE' AND owner='&OWNER' ORDER BY EXECUTIONS DESC; NAME ----------SALARY_PKG NEW_PKG STD_PKG SEL_PKG SQL> EXECUTIONS SHARABLE_MEM KEPT ---------- ------------ ---10149 23169 NO 9111 19858 NO 7550 32964 NO 4537 21549 NO

Since version 81, Oracle has used a concept called touch count to measure how many times an object is accessed in the buffer cache This algorithm of using touch counts for managing the buffer cache is somewhat different from the traditional modified LRU algorithm that Oracle used to employ for managing the cache Each time a buffer is accessed, the touch count is incremented A low touch count means that the block isn t being reused frequently, and therefore is wasting database buffer cache space If you have large objects that have a low touch count but occupy a significant proportion of the buffer cache, you can consider them ideal candidates for the recycle pool Listing 20-5 contains a query that shows you how to find out which objects have a low touch count.

The V$PGASTAT view is analogous the V$SGASTAT view. It shows the usage of the PGA memory. If you have the PGA_AGGREGATE_TARGET initialization parameter set, the view will also show information about the automatic PGA memory management. The following SQL statement will reveal the contents of the V$PGASTAT view: SQL> SELECT * FROM V$PGASTAT;

The TCH column in the x$bh table owned by the user SYS indicates the touch count Listing 20-5 Determining Candidates for the Recycle Buffer Pool SQL> 2 3 4 5 6 7 8 9 10 11 12* SELECT obj object, count(1) buffers, (count(1)/totsize) * 100 percent_cache FROMx$bh, (select value totsize FROM v$parameter WHERE name ='db_block_buffers') WHERE tch=1 OR (tch = 0 and lru_flag <10) GROUP BY obj, totsize HAVING (count(1)/totsize) * 100 > 5 BUFFERS ------14288 12616 22459 PERCENT_CACHE ------------595333333 525666667 935791667.

If you have set the PGA_AGGREGATE_TARGET initialization parameter, you can use the V$PGA_TARGET_ ADVICE view to figure out the optimal size of the PGA memory. The view contains a prediction of the cache-hit performance for various hypothetical values of the PGA_AGGREGATE_TARGET parameter.

The preceding query shows you that three objects, each with a low touch count, are taking up about 20 percent of the total buffer cache. Obviously, they re good candidates for the recycle buffer pool. In effect, you re limiting the number of buffers the infrequently used blocks from these three tables can use up in the buffer cache. The following query on the DBA_OBJECTS view gives you the names of the objects:

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