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Oracle gives you flexibility in the use of the buffer cache by allowing you to configure the database buffer cache into multiple buffer pools. A buffer pool in this context is simply a part of the total buffer cache that is subject to different retention criteria for database objects like tables. For example, you can take a total buffer cache of 500MB and divide it into three pools, with 200MB in the first two pools and 100MB in the third. Once you have created separate buffer pools, you can assign a table exclusively to that buffer pool when you create that table. You can also use the ALTER TABLE or ALTER INDEX command to modify the type of buffer pool that a table or an index should use. Table 5-2 lists the main types of buffer pools that you can configure. Note that any database objects that you haven t assigned to the keep or the recycle buffer pool will be assigned to the default buffer pool, which is sized according to the value you provide for the DB_CACHE_SIZE initialization parameter. The keep and the recycle buffer pools are purely optional, while the default buffer pool is mandatory. Remember that the main goal in assigning objects to multiple buffer pools is to minimize the misses in the data cache and thus minimize your disk I/O. In fact, all buffer-caching strategies have this as their main goal. If you aren t sure which objects in your database belong to the different types of buffer caches, just let the database run for a while with some best-guess multiple cache sizes and query the data dictionary view V$DB_CACHE_ADVICE to get some advice from Oracle itself.
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Table 5-2. Main Buffer Pool Types
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Keeps the data blocks always in memory. You may have small tables that are frequently accessed, so to prevent them from being aged out of the database buffer cache, you can assign the tables to the keep buffer cache when they are created. Removes the data from the cache immediately after use. You need to use this buffer pool carefully, if you decide to use it at all. The recycle buffer pool will cycle out the object from the cache as soon as the transaction is over. Obviously, you would use the recycle buffer pool only for large tables that are infrequently accessed and that do not need to be retained in the buffer cache indefinitely. Contains all data and objects that are not assigned to the keep and recycle buffer pools.
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DB_RECYCLE_CACHE_SIZE
Default buffer pool
DB_CACHE_SIZE
Multiple Database Block Sizes and the Buffer Cache
As was mentioned earlier, you can have multiple block sizes for your database. You have to choose a standard block size first, and then you can choose up to four other nonstandard cache sizes. The DB_BLOCK_SIZE parameter in your initialization parameter file determines your standard block size in the database and frequently is the only block size for the entire database. The DB_CACHE_SIZE parameter in your initialization parameter file specifies the size (in bytes) of the cache of the standard block sized buffers. Notice that you don t set the number of database buffers; rather, you specify the size of the buffer cache itself in the DB_CACHE_SIZE parameter.
CHAPTER 5 ORAC LE DATABA SE 1 1G AR CHITECTURE
You can have up to five different database block sizes in your databases. That is, you can create your tablespaces with any one of the five allowable database block sizes. Although most databases use only a single standard block size (such as 4KB, 8KB, or 16KB), you can choose to use some or all of the four nonstandard block sizes as well. For example, you may have some data warehouse type tables that will benefit from a high database block size, such as 32KB. However, most of the other tables in the database may serve online processing needs, and should use the standard block size of 4KB. If you happen to be using all four of the allowable nonstandard block sizes besides the standard block size buffers, you can create tablespaces with all five block sizes. However, before you can create these nonstandard block size tablespaces, you must configure nonstandard subcaches in the buffer caches for each nonstandard block size you wish to use. You can specify the nonstandard buffer cache subcaches by using the DB_nK_CACHE_SIZE initialization parameter, where n is the block size in kilobytes it can take a value of 2, 4, 8, 16, or 32. As you ve seen, the database buffer cache can be divided into three pools: the default, keep, and recycle buffer pools. The total size of the buffer cache is the sum of memory blocks assigned to all the components of the database buffer cache. The keep and recycle buffer pools can only be created with the standard block size, but you can use up to five different block sizes to configure the default buffer pool. Here s an example that shows how you can specify different values for each of the buffer cache s subcaches in your initialization parameter file. In the example, the numbers on the right show the memory allocated to a particular type of buffer cache. DB_KEEP_CACHE_SIZE = 48MB DB_RECYCLE_CACHE_SIZE = 24MB DB_CACHE_SIZE = 128MB /* standard 4KB block size */ DB_2k_CACHE_SIZE =48MB /* 2KB nonstandard block size */ DB_8k_CACHE_SIZE =192MB /* 8KB nonstandard block size */ DB_16k_CACHE_SIZE = 384MB /* 16KB nonstandard block size */ The total buffer cache size in this example will be the sum of all the preceding subcaches, which comes to about 824MB.
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