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You can set the optimizer mode at the instance, session, or statement level. You set the optimizer mode at the instance level by setting the initialization parameter OPTIMIZER_MODE to ALL_ROWS, FIRST_ROWS_n, or FIRST_ROWS, as explained in the previous section. For example, you can set the goal of the query optimizer for the entire instance by adding the following line in your initialization parameter file: OPTIMIZER_MODE = ALL_ROWS Setting the initialization parameter OPTIMIZER_MODE to ALL_ROWS ensures that we can get the complete result set of the query as soon as feasible. You can also set the optimizer mode for a single session by using the following ALTER SESSION statement: SQL> ALTER SESSION SET optimizer_mode = first_rows_10; Session altered. SQL> The previous statement directs the optimizer to base its decisions on the goal of the best response time for getting the first ten rows of the output of every SQL statement that is executed.

Sender FireEvent() AddNotification()

RAID systems, it must be understood, do not guarantee nonstop access to your mission-critical data. The way to ensure that is to go beyond the basic RAID architecture and build a system that is disaster-tolerant.

Oracle uses several different kinds of files as part of its database. You may need a combination of several of the RAID configurations to optimize the performance of your database while keeping the total cost of the disk arrays reasonable. An important thing to remember here is that when you use a RAID 3 or RAID 5 system, there is no one-to-one correspondence between the physical disks in the array and the logical disks, or logical unit numbers (LUNs), that are used by your system administrator to create logical volumes, which are in turn mounted for your file systems. Advise your system administrator to try and create as many logical volumes on each LUN as there are physical drives in the LUN. This way, the Oracle optimizer will have a more realistic idea about the physical disk setup that the database is using. Logical volumes are deceptive and could mislead the optimizer.

Today s storage technologies are vastly superior to the technologies of even five years ago. Disk drives themselves have gotten faster it is not difficult to find disks with 10,000 RPM and 15,000 RPM spindle speeds today. These disks have seek speeds of about 3.5 milliseconds. In addition, advanced SCSI interfaces and the increasing use of fiber channel interfaces between servers and storage devices have increased data transfer rates to 100MB per second and faster. The capacity of individual disks has also risen considerably, with 180GB disks being fairly common today. The average MTBF for these new-generation disks is also very high sometimes more than a million hours. 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 (NAS) systems. Let s take a closer look at these storage architectures.

Rendezvous Wait For Notifications()

Today, large databases are ubiquitous, with terabyte (1,000GB) databases no longer a rarity. 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. 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. 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.