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Locks are a fundamental component of any relational database management system and are used, among other purposes, to prevent access to data that s in the middle of being modified. Doing so avoids many different problems caused by inconsistent, or dirty, reads. By default, SQL Server reserves sufficient memory for a lock pool consisting of 2,500 locks. If required, and additional buffer space is available, the lock pool will grow using additional memory from the buffer pool. When the number of used locks reaches 40 percent of the size of the (non-AWE) buffer pool, SQL Server will consider lock escalation; for example, it will convert a number of row locks to a single page or table lock, therefore reducing the memory impact of lots of locks. When 60 percent of the buffer pool is used for locks, new lock requests will be denied, resulting in an error. SQL Server will also consider lock escalation at a statement level if the number of locks acquired by the statement on a single object exceeds approximately 5,000. A common (frequently misguided) suggestion is to enable trace flags1 to prevent lock escalation (trace flag 1211 and 1224). Such suggestions are often given in an attempt at avoiding blocking and deadlock scenarios. Such advice is normally a poor alternative to investigating and resolving database design and/or maintenance problems. Further, the large number of resulting locks often leads to significant memory pressure and overall stability issues. Like the Recovery Interval setting, the Locks value can be manually specified, but again, I don t recommend that for almost all cases.

When a query is submitted for execution, SQL Server first checks to see if there s already a cached query plan it can reuse. If no such plan exists, a new plan needs to be created. Avoiding this process through query parameterization is a key performancetuning goal, and one that we ll spend more time on in chapter 17. Regardless of whether the plan was selected from cache or re-created, it can t be executed until enough memory is obtained for the execution process. In systems with poor plan reuse, or those starved of memory (or both), a common occurrence is for queries to time out with the A time out occurred while waiting for memory resources to execute the query error. The estimated cost of the plan determines the length of time that SQL Server will wait for resources before the query times out. By default, SQL Server will wait for 25 times the estimated cost of the query. You can use the Query Wait option to override this default by specifying the amount of time to wait in seconds. The best value to use You guessed it the default.

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Through the ALTER TABLE command, SQL Server 2008 enables lock escalation to be disabled for an individual table.

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The computer operations personnel are responsible for the general operation of the equipment including the central console, its online equipment, and its offline (peripheral) equipment This involves setting up the machine and mounting and removing the tapes, disks, and cartridges as required by the jobs being processed Constantly monitoring the control panel, the operators adjust the equipment as directed by messages from the operating system and according to instructions in operations documentation Troubleshooting if problems arise is

directly attached to a server. It s increasingly common for organizations to use a mixture of both SCSI drives for performance-sensitive applications and SATA drives for applications requiring high amounts of storage. An example of this for a database application is to use SCSI drives for storing the database and SATA drives for storing online disk backups. SAS Serial Attached SCSI (SAS) disks connect directly to a SAS port, unlike traditional SCSI disks, which share a common bus. Borrowing from aspects of Fibre Channel technology, SAS was designed to break past the current performance barrier of the existing Ultra320 SCSI technology, and offers numerous advantages owing to its smaller form factor and backward compatibility with SATA disks. As a result, SAS drives are growing in popularity as an alternative to SCSI.

Fibre Channel Fibre Channel allows high-speed, serial duplex communications between storage systems and server hosts. Typically found on SANs, Fibre Channel offers more flexibility than a SCSI bus, with support for more physical disks, more connected servers, and longer cable lengths. Solid-state disks Used today primarily in laptops and consumer devices, solid-state disks (SSDs) are gaining momentum in the desktop and server space. As the name suggests, SSDs use solid-state memory to persist data in contrast to rotating platters in a conventional hard disk. With no moving parts, SSDs are more robust and promise near-zero seek time, high performance, and low power consumption. We ll cover SSDs in more depth later in this chapter.

In another stock purchase plan one share of stock is offered each month starting at $40 The history of the stock indicates the price will follow C = 40 + 082 for the next year where t is in months If twelve shares are purchased according to this plan, what will be the average price of the stock

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