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New technological architectures for data storage take advantage of all the previous factors to provide excellent storage support to today s Oracle databases. Two such storage architectures are Storage Area Networks (SANs) and Network Attached Storage Systems (NASs). Let s take a closer look at these storage architectures.

Today, large databases are ubiquitous, with terabyte (1,000GB) databases not being a rarity any longer Organizations tend to not only have several large databases for their OLTP work, but also use huge data warehouses and data marts for supporting management decision making Storage Area Networks (SANs) use high-performance connections and RAID storage techniques to achieve the high performance and reliability that today s information organizations demand Modern data centers use SANs to optimize performance and reliability SANs can be very small or extremely large, and they lend themselves to the latest technologies in disk storage and network communications Traditionally, storage devices were hooked up to the host computer through a SCSI device SANs can be connected to servers via high-speed fiber channel technology with the help of switches and hubs.

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many or as few rows as you like. The big_table.sql script is documented in the Setting Up section at the beginning of this book.

You can adapt legacy SCSI-based devices for use with a SAN, or you can use entirely new devices specially designed for the SAN A SAN is enabled by the use of fiber channel switches called brocade switches By using hubs, you can use SANs that are several miles away from your host servers The chances are that if you are not using one already, you ll be using a SAN in the very near future SANs offer many benefits to an organization They allow data to be stored independently of the servers that run the databases and other applications They enable backups that do not affect the performance of the network They facilitate data sharing among applications SANs are usually preconfigured, and depending on your company s policy, they could come mirrored or as a RAID 5 configuration.

Public Sub FireEvent() ' send a notification from Sender to Receiver senderFireEvent(DateTimeNowToString()) End Sub End Class The Receiver class fires a NotificationReceived event when a new file is found A problem with the numbered-file approach is that it requires the sender and receiver to remain in sync regarding the next file number to use If the sender or receiver crashes and restarts, the file numbers will get out of sync The sender could resynchronize by scanning the shared directory and getting the number of the most recent file it finds If no files were present, it would mean that there were no pending notifications, so the sender could start the number sequence from the beginning, saving the next file with the name SharedFile000.

The individual disks in the SANs are not directly controllable by the UNIX system administrator, who will see the LUN as a single disk the storage array s controllers map the LUNs to the underlying physical disks The administrator can use LVMs to create file systems on these LUNs after incorporating them into volume groups first When you use RAID-based storage arrays, the RAID controllers on the SAN will send the server I/O requests to the various physical drives, depending on the mirroring and parity level chosen..

Now, I ran that small query script against a database with a PGA_AGGREGATE_TARGET of 256MB, meaning I wanted Oracle to use up to about 256MB of PGA memory for sorting. I set up another script to be run in other sessions to generate a large sorting load on the machine. This script loops and uses a built-in package, DBMS_ALERT, to see if it should continue processing. If it should, it runs the same big query, sorting the entire BIG_TABLE table. When the simulation was over, a session could signal all of the sorting processes, the load generators, to stop and exit. The script used to perform the sort is as follows: declare l_msg long; l_status number; begin dbms_alert.register( 'WAITING' ); for i in 1 .. 999999 loop dbms_application_info.set_client_info( i ); dbms_alert.waitone( 'WAITING', l_msg, l_status, 0 );

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