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You ll learn how to perform each of these tasks in 5 There is no hard and fast rule regarding the number of tablespaces you can have in an Oracle database The following five tablespaces are generally the default tablespaces that all databases must have, even though it s possible to create and use a database with just the first two: System tablespace Sysaux tablespace Undo tablespace Temporary tablespace Default permanent tablespace Traditionally, Oracle DBAs have used dozens and sometimes even hundreds of tablespaces to store all their application tables and indexes, and if you really think you need a large number of tablespaces to group all related application tables and indexes together, that s okay However, you aren t required to use a large number of tablespaces.

Today, most organizations use logical volume managers (which were discussed in 3) to stripe the logical volumes and the data files over a number of physical disks Thus, a large tablespace could span several physical disks Previously, it was necessary to create tablespaces on different physical disks to avoid I/O contention, but with today s disk organization structures you don t have that problem, and you can make do with fewer tablespaces if you wish You can use just one tablespace for all your application data if you wish, since the data files that are part of the tablespace are going to be spread out over several disks anyway This is also why the traditional requirement to separate tables and index data in different tablespaces isn t really valid anymore..

Oracle DBAs have traditionally used a large number of tablespaces for managing database objects. Unfortunately, the larger the number of tablespaces in your database, the more time you ll have to spend on mundane tasks, such as monitoring space and allocating space to the tablespaces. Disk contention between indexes and tables and other objects were pointed out as the reason for creating large numbers of tablespaces, but with the types of disk management used today in most places, where Logical Volume Managers stripe operating system files over several disk spindles, traditional tablespace-creation rules don t apply. You re better off using a very small number of tablespaces perhaps just four or five to hold all your data.

You can assign a user a tablespace quota, thus limiting the user to a certain amount of storage space in the tablespace. You can do this when you create the user, or by using the ALTER USER statement at a later time. 11 shows you how to assign tablespace quotas to users. In 6, I discuss Oracle s Resumable Space Allocation feature. User-quota-exceeded errors are an important type of resumable statement. When a user exceeds the assigned quota, Oracle will automatically raise a space-quota-exceeded error.

C++/CLI s interoperability features pretty much bind you to the CLR. No other CLI implementation supports the features required for executing mixed-code assemblies. Since most Visual C++ developers build code for Windows desktop and server operating systems, a dependency to the CLR is typically not a problem. However, if you want to migrate projects created in eMbedded Visual C++, you cannot use C++/CLI. This restriction exists because the Compact Framework (the CLI implementation for Windows CE based platforms) is not capable of executing managed code generated by /clr and /clr:pure. At the time of this writing, it is unclear whether a future version of the Compact Framework will support all the features required by C++/CLI interoperability. Without a CLR installed on the client machine, your application startup will fail, and you ll get the message shown in Figure 7-1.

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