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Suppose you have a tablespace that has a block size of 8KB, as shown in the following example: SQL> SELECT NAME, VALUE FROM V$SPPARAMETER 2 WHERE NAME='db_block_size'; NAME VALUE ------------------------------db_block_size 8192 SQL> Because the block size is 8KB and you have only a single block size, all your tablespaces are created with this default size. Suppose that you now want to create a tablespace with a higher block size for example, 16KB. Creating a database consisting of tablespaces with different block sizes is easy each of the tablespace block sizes in the database should correspond to a DB_nK_CACHE_SIZE parameter value. Thus, if you want five tablespaces with different sized blocks, you must have all five of the buffer cache sizes configured. In Listing 17-15, which shows the results of a query in my test database, you don t see any values under any of the five possible DB_nK_CACHE_SIZE parameters. This is because I chose only one block size, the standard block size of 8KB, and none of the other optional cache sizes. My total DB_CACHE_SIZE value is shown as 25MB (2,516,824 bytes) in the listing, and it s composed of the standard 8KB blocks.
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Listing 17-15. The Buffer Cache nK Size Components SQL> SELECT NAME, VALUE FROM V$PARAMETER 2 WHERE NAME LIKE '%cache_size%'; NAME VALUE ---------------------------------------------db_keep_cache_size 0 db_recycle_cache_size 0 db_2k_cache_size 0 db_4k_cache_size 0 db_8k_cache_size 0 db_16k_cache_size 0 db_32k_cache_size 0 db_cache_size 25165824 8 rows selected. SQL> You can easily create a new buffer cache size of 16KB online and create a new tablespace with that block size. You can then create your objects in this new tablespace or move any existing objects into this tablespace, all online. Here s what you have to do. First, create a new 16KB buffer cache, so you can create a tablespace with a 16KB block size. SQL> ALTER SYSTEM SET DB_16K_CACHE_SIZE =1024M; System altered. SQL> Now you can create your new tablespace with the 16KB block size, because you have a matching 16KB buffer cache size. Here s the CREATE TABLESPACE statement: SQL> CREATE TABLESPACE big_block 3 DATAFILE '/test01/app/oracle/big_block_01.dbf' SIZE 1000M 4* BLOCKSIZE 16K; Tablespace created. SQL> If you have a table that you want to move to the new big_block tablespace with the 16KB block size, all you have to do is use the MOVE command: SQL> ALTER TABLE test MOVE TABLESPACE big_block; Table altered. SQL> Of course, you can also use the online table redefinition method to move your table to the new tablespace.
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Suppose you want to change the schema of a table. If a transaction is currently using this table, you can t perform this task. If a PL/SQL procedure is later updated to reflect the change in the schema, users currently trying to execute the procedure will receive an error. Fortunately, Oracle has a great quiescing feature, whereby you don t have to shut down the database and open it in restricted mode.
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You can use this feature when you need to perform actions that require that no active transactions are running in the database. Users will remain logged in and they can execute their requests while the database is in the quiesced state. The database, however, will block all transactional requests except those made by the users SYS and SYSTEM. Users can continue to query the database, which means the database is more available than a database in the restricted mode. Quiescing thus puts the database in a partially available state. When you take the database out of the quiesced state, any user requests that were blocked are processed automatically. The following commands perform the quiescing and unquiescing of the database: SQL> ALTER SYSTEM QUIESCE RESTRICTED; SQL> ALTER SYSTEM UNQUIESCE;
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