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level, waits can be broken down into two categories: signal waits or resource waits. In SQL Server, signal waits occur when the scheduler is waiting on a processor resource to schedule the task, and resource waits occur when the task has been assigned to a processor resource but are waiting for disk or memory resources. When examining overall waits for an application, if there is a high ratio of signal to resource waits (that is, if there are many more signal waits than resource waits), it might signify an inefficient use of processor resources. If there is a high ratio of resource to signal waits, that can indicate an inefficient use of disk resources. To begin the process of evaluating application performance, developers need to understand which of these wait types is most prevalent. Fortunately, SQLOS provides a window into the system that is granular enough that developers are able to use it to answer the question.

Linked servers have two components that you need to be aware of. The linked server might require Open Database Connectivity (ODBC) drivers or OLE DB providers that are not loaded on the secondary. A login and password might also be embedded into the linked server definition. You need to install any ODBC drivers or OLE DB provid ers that are required by a linked server. The linked server also needs to be re-created with the correct login credentials. SSIS packages are generally used to load data into or extract data from a database. Any SSIS packages that depend upon the primary database have to be re-created on the secondary. Be careful to ensure that cross-dependencies are eliminated from these packages. For example, you could have an SSIS package that extracts or loads data

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With SQL Server 7 and SQL Server 2000 and the UMS, developers could never tell whether application performance problems were a result of signal waits or resource waits. Many times a developer would use a tool such as Windows System Monitor, notice that the processor was very busy, and assume that she needed to upgrade her machine to a faster processor. In reality, because of how UMS accomplishes thread manipulation, the problem was really caused by a slow disk subsystem, and upgrading to a faster processor simply exacerbated the problem. With SQLOS, this problem no longer exists, but developers must know how to utilize the new functionality in SQLOS to understand signal waits versus resource waits.

The SQL Server:Databases object provides the Transactions/sec counter. This counter records only transactions that change data, or explicit transactions. Queries that do not change data are implicit but nevertheless, they are transactions. In spite of this limitation, the Transactions/sec counter is useful for determining whether the number of transactions that run against a database has increased substantially. If the long-term average is (say) 20 transactions per second and you suddenly see readings of 200 transactions per second or more, the problem could be a faulty application, but more likely the server hardware can no longer cope with server activity. The Transactions/sec counter reading indicates how active your SQL Server 2005 system is, rather than any specific fault. A higher value indicates more activity is occurring.

into Database1, Database2, and Database3 If only Database2 were participating in log shipping, the SSIS package would fail if it were copied to the secondary In this case, you would need to redesign the SSIS package so that the extract or load process for each database is a separate package and then create a master package to call the appropriate subpackages Endpoints are used to control access to various resources within an instance or a data base Any endpoints that are used with the primary database need to be re-created on the secondary To control access to the secondary, each of these endpoints should be configured with STATE=STOPPED SQL Server Agent has several objects that might be needed on the secondary Any jobs that depend upon the primary database have to be re-created on the secondary.

The following query utilizes the sys.dm_os_wait_states DMV to query SQLOS and report on resource versus signal waits: