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A high number of recursive SQL statements may also indicate that Oracle is busy with space management activities, such as allocating extents. This has a detrimental effect on performance. You can avoid this problem by increasing the extent sizes for your database objects. This is another good reason to choose locally managed tablespaces, which cut down on the number of recursive SQL statements.
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Operating system physical memory holds all the data and programs by loading them from disk. System CPU executes programs only if they re loaded into the physical memory. If excessive memory usage occurs, the operating system will use virtual memory, which is storage space on secondary storage media such as disks, to hold temporarily some of the data and/or programs being used. The space for the virtual memory is called swap space. When the system needs room in the physical or main memory, it swaps out some programs to the swap area, thus freeing up additional physical memory for an executing program. The operating system swaps out data in units called pages, which are the smallest units of memory that can be used in transferring memory back and forth between physical memory and the swap area. When the operating system needs a page that has been swapped out to the swap area, a page fault is said to occur. Page faults are commonly referred to as simply paging, and involve the transfer of data from virtual memory back to the physical memory. An excessive amount of paging results in degradation of operating system performance, and thus affects Oracle instance performance as well. One of the best ways to check operating system memory performance is by using the vmstat utility, which was explained in 3.
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CHAPTER 22 PERFORMANCE TUNING: TUNING THE INSTANCE
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The way you configure your disk system has a profound impact on your I/O rates. You have to address several issues when you re planning your disk system. Important factors that have a bearing on your I/O are as follows: Choice of RAID configuration: 3 covered RAID system configuration in detail. Just remember that a RAID 5 configuration doesn t give you ideal I/O performance if your application involves a large number of writes. For faster performance, make sure you use a configuration that involves striping your disks, preferably according to the Oracle guidelines. Raw devices or operating system file systems: Under some circumstances, you can benefit by using raw devices, which bypass the operating system buffer cache. Raw devices have their own drawbacks, though, including limited backup features, and you want to be sure the benefits outweigh the drawbacks. Raw devices in general provide faster I/O capabilities and give better performance for a write-intensive application. You might also want to consider alternative file systems such as Veritas VXFSS, which helps large I/O operations through its direct I/O option. I/O size: I/O size is in terms of the Oracle block size. The minimum size of I/O depends on your block size, and the maximum size depends on the DB_FILE_MULTIBLOCK_READ_COUNT initialization parameter. If your application is OLTP based, the I/O size needs to be small, and if your application is oriented toward a DSS, the I/O size needs to be much larger. In Oracle Database 10.2, the database automatically tunes this parameter, if you don t set it. Logical volume stripe sizes: Stripe size (or stripe width) is a function of the stripe depth and the number of drives in the striped set. If you stripe across multiple disks, your database s I/O performance will be higher and its load balancing will be enhanced. Make sure that the stripe size is larger than the average I/O request; otherwise, you ll be making multiple I/Os for a single I/O request by Oracle. If you have multiple concurrent I/O requests, your stripe size should be much larger than the I/O size. Most modern LVMs can dynamically reconfigure the stripe size. Number of controllers and disks: The number of spindles and the number of controllers are both important variables in determining disk performance. Even if you have a large number of spindles, you could conceivably run into contention at the controller level. Distribution of I/O: Your goal should be to avoid a lopsided distribution of I/O in your disk system. If you re using an LVM or using striping at the hardware level, you don t have a whole lot to worry about in this area. However, if you aren t using an LVM or using striping at the hardware level, you should manually arrange your data files on the disks such that the I/O rate is fairly even across the system. Note that your tables and indexes are usually required to be in different tablespaces, but there is no rule that they have to be placed on different disks. Because the index is read before the table, they can coexist on the same disk.
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