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Each of these jobs should be disabled to ensure that the jobs do not run If you have any job categories, job schedules, operators, or alerts configured that are associated to the pri mary database, you have to re-create each of these objects on the secondary DDL triggers can be created at an instance level as well as at a database level Databaselevel DDL triggers already exist on the secondary because the triggers are part of the database However, instance-level DDL triggers need to be re-created on the secondary A primary database can participate as either a publisher or a subscriber within a rep lication architecture The replication configuration directly codes the instance and database names for publisher, subscriber, and distributor Although the database name is usually the same on the secondary, the instance name is different.

Even though all the replication objects already exist within the secondary database, they are not usable Upon failing over to the secondary, you need to plan to reconfigure your replication architecture after the secondary is online..

SELECT signal_wait_time_ms=sum(signal_wait_time_ms) ,'%signal waits' = cast(100.0 * sum(signal_wait_time_ms) / sum (wait_time_ms) AS NUMERIC (20,2)) ,resource_wait_time_ms=sum(wait_time_ms - signal_wait_time_ms) ,'%resource waits'= cast(100.0 * sum(wait_time_ms - signal_wait_time_ms) / sum (wait_time_ms) AS NUMERIC(20,2)) FROM sys.dm_os_wait_stats;

The SQL Server:SQL Statistics object provides counters to monitor compilation and the type of requests sent to an instance of SQL Server. Monitoring the number of query compilations and recompilations as well as the number of batches received by an instance of SQL Server gives you an indication of how quickly SQL Server is processing user queries and how effectively the query optimizer is processing the queries. The Transactions/sec counter does not measure activity unless it is inside an explicit transaction. However, the SQL Server:SQL Statistics: Batch Requests/sec counter measures all batches you send to the server even if they do not participate in a transaction. SQL Server Books Online identifies the latter counter as a good indicator of throughput, although Transactions/sec is the counter that many people use in the field. SQL Server Agent alerts, however, are typically triggered on Batch Requests/sec rather than Transactions/sec.

Any instance-level objects that are copied to the secondary have to be maintained. For example, if you make a change to the SSIS package on the primary, the change must also be saved to the secondary.

Executing this query on a SQL Server 2005 machine will return a result set that provides details on the percentage of overall waits and whether they are signal or resource waits, as shown in Figure B-7. Generally, systems that exhibit a low signal-to-resource wait exhibit the best overall performance.

1. Changing the primary database into which recovery model breaks log shipping 2. On which type of backup is log shipping based 3. Which operation cannot be performed against the secondary database to continue to apply transaction log backups

1. Changing the recovery model of a database to Simple breaks the transaction log chain and does not allow transaction log backups to be executed. 2. Transaction log backups. 3. The database cannot be recovered, so you cannot issue RESTORE DATA BASE WITH RECOVERY.

When performing normal performance-monitoring tasks (for a discussion of normal performance monitoring, see 8, Improving Database Application Performance, Lesson 2, Resolving Performance Problems ), database developers can isolate a specific SPID that is causing performance issues, such as excessive blocking or excessive memory consumption. Using SQLOS, developers can dig deeper into the process to determine the exact statement that is executing, as well as the resource utilization by the process. The following query utilizes the sys.dm_exec_requests DMV to query all non-system processes and report on specific resource utilization (to isolate a specific process, replace the >50 in the WHERE clause with the specific process ID you wish to view):

2

In this exercise, you will configure a log shipping session for the AdventureWorks data base between two instances of SQL Server.

For consistency, we will refer to the instance that will be hosting the primary database as INSTP and the instance that will be hosting the secondary database as INSTS.

SELECT r.session_id ,status ,substring(qt.text,r.statement_start_offset/2, (CASE WHEN r.statement_end_offset = -1 then len(convert(nvarchar(max), qt.text)) * 2 ELSE r.statement_end_offset END - r.statement_start_offset)/2) AS query_text ,qt.dbid ,qt.objectid ,r.cpu_time ,r.total_elapsed_time ,r.reads ,r.writes