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One of your primary goals as a DBA is to optimize the expensive I/O involved in reading from and writing to disk If you have tables with very long rows, you are better off with a larger block size each read will fetch more data than you d get with a smaller block size, and you ll need fewer read operations to get the same amount of data Tables with large object (LOB) data will also benefit from a very large block size On the other hand, tables with small row lengths can use a small block size as the building block for the tablespace If you have large indexes in your database, you will need a large block size for their tablespace, so that each read will fetch a larger number of index pointers.

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Optimal caching of data: Oracle provides separate pools for the various block sizes, and this leads to a better use of Oracle s memory I discuss this in the following sections Easier transport of tablespaces: If you have tablespaces with multiple block sizes, it s easier to use Oracle s transport tablespaces feature In 13, you ll find examples showing you how to transport tablespaces between databases..

Note Each Oracle tablespace consists of one or more operating system data files, and a data file can only belong to one tablespace. At database creation time, the only two tablespaces you must have are the System tablespace (the key Oracle tablespace, which contains Oracle s data dictionary), and the Sysaux tablespace (which is auxiliary to the System tablespace and contains data used by various Oracle products and features). Oracle will automatically create the System tablespace first, followed by the Sysaux tablespace, but you provide a data file for each. Later on, you can add and drop tablespaces as you wish, but you can t drop or rename the System and Sysaux tablespaces.

"pcpu") curr_proc_cpu=`echo $pid_string | awk '{print $4}' | \ awk -F. '{print $1}'` test $debug -gt 0 && echo "Current percent cpu of \ $process pid $pid is $curr_proc_cpu"

SQL> SELECT table_name FROM dba_tables 2 WHERE owner ='OUTLN'; TABLE_NAME ----------OL$ OL$HINTS OL$NODES SQL>

You can use the USER_OUTLINES (or DBA_OUTLINES) and USER_OUTLINE_HINTS views to get information about the stored outlines in your database. The following code shows the output of such a query: SQL> SELECT name,used, 2* timestamp, sql_text FROM user_outlines; NAME USED TIMESTAMP SQL_TEXT -------------------------------------SYS_02283 SQL> USED 25-JUL-05 SELECT * FROM EMP

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Installing a verifiable assembly in a SQL Server 2005 database can be done by using a new command named CREATE ASSEMBLY. Installing assemblies compiled with /clr:pure is more complicated because /clr:pure assemblies are unverifiable. This sidebar describes all the necessary steps. To install an unverifiable assembly in a SQL Server 2005 database, you first need to create an asynchronous key that describes the public key of your assembly: USE master GO IF EXISTS (SELECT * FROM sys.asymmetric_keys WHERE name=N'MyAssemblyStrongName') DROP ASYMMETRIC KEY [MyAssemblyStrongName] GO CREATE ASYMMETRIC KEY [MyAssemblyStrongName] FROM EXECUTABLE FILE='c:\ MyUnverifiableAssembly.dll' GO Once you have done that, you can create a new login from the new asymmetric key: IF EXISTS (SELECT * FROM sys.server_principals WHERE name = N'MyStrongNamedAssemblies') DROP LOGIN [MyStrongNamedAssemblies] GO CREATE LOGIN [MyStrongNamedAssemblies] FROM ASYMMETRIC KEY [MyAssemblyStrongName]

For Oracle to use stored outlines consistently, you need to turn the USE_STORED_OUTLINES parameter on by setting its value to TRUE. By doing this, you re ensuring that the CBO is stable and won t change its plans over time. If the system tablespace is being filled up with too many stored outlines, you can drop some of the outlines by using the DBMS_OUTLN.DROP_UNUSED procedure. This procedure, which doesn t need any parameters, removes all literal SQL outlines from the OUTLN tables. The DBMS_OUTLN_EDIT.CREATE_EDIT_TABLES procedure. creates tables in a user s schema if you need to edit any private outlines. The DBMS_OUTLN_EDIT.DROP_TABLES procedure enables you to drop the outlined editing tables.

Once again, we compare the percentage CPU value with the configured low and high thresholds and call the notify() function to alert the user and perform any required process termination. If the CPU percentage is below either of these values, the code outputs an OK message.