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performed on them is direct I/O, without any OS buffering of data (which, for a database, is generally a positive attribute) Automatic Storage Management (ASM): This is a new feature of Oracle 10g Release 1 (for both Standard and Enterprise editions) In releases prior to 11g Release 2, ASM is a file system designed exclusively for use by the database An easy way to think about it is as a database file system You won t store your shopping list in a text file on this particular file system you ll store only database-related information here: tables, indexes, backups, control files, parameter files, redo logs, archives, and more But even in ASM, the equivalent of a data file exists; conceptually, data is still stored in files, but the file system is ASM ASM is designed to work in either a single machine or clustered environment.

package banking; import logging.*;

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Since Oracle 11g Release 2, ASM provides not only this database file system but optionally a clustered file system as well, which is described next Clustered file system: This is specifically for a RAC (clustered) environment and provides what looks like a cooked file system that is shared by many nodes (computers) in a clustered environment A traditional cooked file system is usable by only one computer in a clustered environment So, while it is true that you could NFS mount or Samba share (a method of sharing disks in a Windows/UNIX environment similar to NFS) a cooked file system among many nodes in a cluster, it represents a single point of failure If the node owning the file system and performing the sharing failed, that file system would be unavailable.

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In releases of Oracle prior to 11g Release 2, the Oracle Cluster File System (OCFS) is Oracle s offering in this area and is currently available for Windows and Linux only Other third-party vendors provide certified clustered file systems that work with Oracle as well Oracle Database 11g Release 2 provides another option in the form of ACFS, the ASM Clustered File System A clustered file system brings the comfort of a cooked file system to a clustered environment..

public aspect LogAccountActivities extends IndentedLogging { declare precedence : LogAccountActivities, *; pointcut accountActivity(Account account, float amount) : ((execution(void Account.credit(float)) || execution(void Account.debit(float))) && this(account) && args(amount)) || (execution(void CheckClearanceSystem.*(Account, float)) && args(account, amount)); protected pointcut loggedOperations() : accountActivity(Account, float); void around(Account account, float amount) : accountActivity(account, amount) { try { System.out.println("[" + thisJoinPointStaticPart.getSignature().toShortString() + "] " + account + " " + amount); System.out.println("Before: " + account.getBalance()); proceed(account, amount); } finally { System.out.println("After: " + account.getBalance()); } } }

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Note As of Oracle Database 11g Release 1 (11.1.0.7), there is yet another file system available Exadata.

The accountActivity() pointcut simply captures the Account interface s debit() and credit() methods as well as the CheckClearanceSystem class s methods that take Account and float arguments. The around advice prints the context information before and after the captured transactions. Running the program At this point, let s compile the code without including either a minimum balance or an overdraft protection aspect. We will, however, include the logging aspect so that we can understand the steps of the transaction. When we run the test program, we get this output:

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Exadata is a storage area network for Oracle specifically designed for the database. It is beyond the scope of this book to describe that piece of hardware however, so we will not be discussing it in any detail.

The interesting thing is that a database might consist of files from any or all of the preceding file systems you don t need to pick just one. You could have a database whereby portions of the data were stored in conventional cooked file systems, some on raw partitions, others in ASM, and yet other components in a clustered file system. This makes it rather easy to move from technology to technology, or to just get your feet wet in a new file system type without moving the entire database into it. Now, since a full discussion of file systems and all of their detailed attributes is beyond the scope of this book, we ll dive back into the Oracle file types. Regardless of whether the file is stored on cooked file systems, in raw partitions, within ASM, or on a clustered file system, the following concepts always apply.

Note You might wonder why only 2MB of RAM is reported in use by the system with one active user. It

> ajc banking\*.java logging\*.java > java banking.Test [AccountSimpleImpl.credit(..)] SavingsAccount(1) 1000.0 Before: 0.0 After: 1000.0 [AccountSimpleImpl.credit(..)] CheckingAccount(2) 1000.0 Before: 0.0 After: 1000.0

A database is made up of one or more tablespaces. A tablespace is a logical storage container in Oracle that comes at the top of the storage hierarchy and is made up of one or more data files. These files might be cooked files in a file system, raw partitions, ASM-managed database files, or files on a clustered file system. A tablespace contains segments, as described next.

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