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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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CH A PT ER 2 0 PERF O RMAN CE TUNI NG: TUN ING TH E I NS TA NCE
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SQL> SELECT object_name FROM DBA_OBJECTS 2 WHERE object_id IN (1386,1412,613114); OBJECT_NAME ----------------EMPLOYEES EMPLOYEE_HISTORY FINANCE_RECS SQL> You can then assign these three objects to the reserved buffer cache pool. You can use a similar criterion to decide which objects should be part of your keep buffer pool. Say you want to pin all objects in the keep pool that occupy at least 25 buffers and have an average touch count of more than 5. Listing 20-6 shows the query that you should run as the user SYS. Listing 20-6. Determining Candidates for the Keep Buffer Cache SQL> 2 3 4 5 6 7 8* SELECT obj object, count(1) buffers, AVG(tch) average_touch_count FROM x$bh WHERE lru_flag = 8 GROUP BY obj HAVING avg(tch) > 5 AND count(1) > 25; BUFFERS ---------36 87 AVERAGE_TOUCH_COUNT -------------------67 57.137931
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OBJECT ---------1349785 4294967295 SQL>
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Again, querying the DBA_OBJECTS view provides you with the names of the objects that are candidates for the keep buffer cache pool. Here s a simple example to show how you can assign objects to specific buffer caches (keep and recycle). First, make sure you configure the keep and recycle pools in your database by using the following set of initialization parameters: DB_CACHE_SIZE=256MB DB_KEEP_CACHE_SIZE=16MB DB_RECYCLE_CACHE_SIZE=16MB In this example, the keep and recycle caches are 16MB each. Once you create the keep and recycle pools, it s easy to assign objects to these pools. All tables are originally in the default buffer cache, where all tables are cached automatically unless specified otherwise in the object creation statement. You can use the ALTER TABLE statement to assign any table or index to a particular type of buffer cache. For example, you can assign the following two tables to the keep and recycle buffer caches: SQL> ALTER TABLE test1 STORAGE (buffer_pool keep); Table altered. SQL> ALTER TABLE test2 STORAGE (buffer_pool recycle); Table altered. SQL>
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CHAPTER 20 PERFOR MAN CE TUNING: TUNING THE INSTA NCE
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Note For details about Oracle s touch-count buffer management, please download Craig A. Shallahamer s interesting paper All About Oracle s Touch-Count Data Block Buffer Algorithm using this URL: http:// resources.orapub.com/product_p/tc.htm.
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Tuning the Large Pool, Streams Pool, and Java Pool
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You mainly use the large pool, an optional component of the SGA, in shared server systems for session memory, for facilitating parallel execution for message buffers, and for backup processes for disk I/O buffers. Oracle recommends the use of the large pool if you re using shared server processes so you can keep the shared pool fragmentation low. If you re using shared server configurations, you should configure the large pool. The streams pool is relevant only if you re using the Oracle Streams feature. You don t have to bother with tuning the Java pool allocation unless you re using heavy Java applications.
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Note You size the large pool based on the number of active simultaneous sessions in a shared server environment. Remember that if you re using the shared server configuration and you don t specify a large pool, Oracle will allocate memory to the shared sessions out of your shared pool.
Tuning PGA Memory
Each server process serving a client is allocated a private memory area, the PGA, most of which is dedicated to memory-intensive tasks such as group by, order by, rollup, and hash joins. The PGA area is a nonshared area of memory created by Oracle when a server process is started, and it s automatically deallocated upon the end of that session. Operations such as in-memory sorting and building hash tables need specialized work areas. The memory you allocate to the PGA determines the size of these work areas for specialized tasks, such as sorting, and determines how fast the system can finish them. In the following sections you ll examine how you can decide on the optimal amount of PGA for your system.
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