Instructor InputsSession 9..Session OverviewThis session includes the following topics: Linked pps

Instructor Inputs Session 9 ¤NIIT Instructor Inputs 9.3 This session includes the following topics:  Linked servers  Types of replication  Monitoring and improving replication performance  Resolving conflicts in merge replication  Recovering from a failure in replication  Using KILL statement  Best practices  Tips and Tricks  FAQs Slide 1 Installing Windows XP Professional Using Attended Installation Slide 1 of 19 Ver. 1.0 Querying, Managing, and Administering Databases Using SQL Server 2005 Collaborate Session 9 Objectives In this session, you will learn about: Linked servers Types of replication Monitoring and improving replication performance Resolving conflicts in merge replication Recovering from a failure in replication Using KILL statement Best practices that can be considered while replicating databases in SQL Server 2005 Tips and tricks that will help you use import and export utilities in SQL Server 2005 FAQs related to replication concepts of SQL Server 2005 Session Overview 9.4 Instructor Inputs ¤NIIT Slide 2 Installing Windows XP Professional Using Attended Installation Slide 2 of 19 Ver. 1.0 Querying, Managing, and Administering Databases Using SQL Server 2005 Colla borate Session 9 Knowledge Byte Linked server: Is like an alias on a local SQL Server that points to an external data source. Offers the following advantages: Remote server access. The ability to issue distributed queries, updates, commands, and tr ansactions on heter ogeneous data sourc es across the enterprise. The ability to address diverse data sources similarly. Specifies the following objects: An OLE DB provider An OLE DB data source Slide 3 Installing Windows XP Professional Using Attended Installation Slide 3 of 19 Ver. 1.0 Querying, Managing, and Administering Databases Using SQL Server 2005 Colla borate Session 9 Knowledge Byte (Contd.) SQL Server 2005 provides the following types of replications: Snapshot replication: is used to replicate data that does not change frequently. is also used when the subscribers require read-only data with a high degree of latency time. Transactional replication: is used when the subscribers require the updated data with minimal delay. is generally implemented at the server-to-server level. Merge replication: is used when both the publishers as well as the subscribers can change the data. In this case, changes are replicated to all the subscribers and publishers until all the servers have the same data. ¤NIIT Instructor Inputs 9.5 Slide 4 Installing Windows XP Professional Using Attended Installation Slide 4 of 19 Ver. 1.0 Querying, Managing, and Administering Databases Using SQL Server 2005 Collaborate Session 9 Knowledge Byte (Contd.) Replication Monitor: Is a graphical tool that allows you to track the overall activity of a replication. Provides information on the status and performance of publications and subscriptions. Window has two panes, the left and the right pane. The left pane shows the list of publishers and its associated publications. The right pane contains three tabs, All Subscriptions, Tracer Tokens, and Warnings and Agents. Slide 5 Installing Windows XP Professional Using Attended Installation Slide 5 of 19 Ver. 1.0 Querying, Managing, and Administering Databases Using SQL Server 2005 Collaborate Session 9 Knowledge Byte (Contd.) Replication conflict occurs in merge replication when copies of an article that are part of a subscription are updated at two subscriber locations or on a publisher and a subscriber. The articles can be updated by any of the INSERT, UPDATE, or DELETE DML statements. The detection of replication conflict is done by the merge agent. 9.6 Instructor Inputs ¤NIIT Slide 6 Installing Windows XP Professional Using Attended Installation Slide 6 of 19 Ver. 1.0 Querying, Managing, and Administering Databases Using SQL Server 2005 Colla borate Session 9 Knowledge Byte (Contd.) To recover from a failure in replication: A best practice is to maintain back ups of the publisher and subscriber data. Take a full backup of the publisher database and maintain regular backups at regular intervals after short periods. Maintain backup of distribution database. Set the minimum transaction retention period at the distributor. This retention period should be greater than the transaction log backup period at publisher. Slide 7 Installing Windows XP Professional Using Attended Installation Slide 7 of 19 Ver. 1.0 Querying, Managing, and Administering Databases Using SQL Server 2005 Colla borate Session 9 Knowledge Byte (Contd.) The KILL statement is used to terminate a process on the basis of the session ID. The KILL statement can also be used to terminate a normal connection, which internally terminates the transactions that are associated with the specified session ID. The syntax of using a KILL statement is: KILL { session ID } [ WITH STATUSONLY ] where, session_ID is the session ID of the process to terminate. session_ID is a unique integer that is assigned to each user connection when the connection is made. ¤NIIT Instructor Inputs 9.7 Slide 8 Installing Windows XP Professional Using Attended Installation Slide 8 of 19 Ver. 1.0 Querying, Managing, and Administering Databases Using SQL Server 2005 Collaborate Session 9 Best Practices Program your application to use stand by server in case of database failover. Backup replication databases regularly. The following databases should be backed up regularly: Publication database Distribution database Subscription databases msdb database and master database at the Publisher, Distributor, and Subscribers server Validate data periodically to verify the replication between Subscriber and Publisher. Slide 9 Installing Windows XP Professional Using Attended Installation Slide 9 of 19 Ver. 1.0 Querying, Managing, and Administering Databases Using SQL Server 2005 Collaborate Session 9 Tips and Tricks When the bcp utility is connecting to SQL Server with a trusted connection using integrated security, use the -T option (trusted connection) instead of the user name and password combination. While using bcp utility do not use a blank password, use a strong password. While using bcp utility, if the file name includes a space or quotation mark at the command prompt, enclose the identifier in quotation marks (""). 9.8 Instructor Inputs ¤NIIT Slide 10 Installing Windows XP Professional Using Attended Installation Slide 10 of 19 Ver. 1.0 Querying, Managing, and Administering Databases Using SQL Server 2005 Colla borate Session 9 Do you need to stop an Activity on a database when it is published? No, Activity can continue on a database while a publication is being created. FAQs Slide 11 Installing Windows XP Professional Using Attended Installation Slide 11 of 19 Ver. 1.0 Querying, Managing, and Administering Databases Using SQL Server 2005 Colla borate Session 9 When is a subscription available? A subscription is available after a snapshot has been applied to the subscription database. FAQs (Contd.) ¤NIIT Instructor Inputs 9.9 Slide 12 Installing Windows XP Professional Using Attended Installation Slide 12 of 19 Ver. 1.0 Querying, Managing, and Administering Databases Using SQL Server 2005 Collaborate Session 9 What recovery model is required on a replicated database? Replication functions properly using any of the recovery models: simple, bulk-logged, or full. FAQs (Contd.) Slide 13 Installing Windows XP Professional Using Attended Installation Slide 13 of 19 Ver. 1.0 Querying, Managing, and Administering Databases Using SQL Server 2005 Collaborate Session 9 Does replication encrypt data? No, replication does not encrypt data that is stored in the database or transferred over the network. FAQs (Contd.) 9.10 Instructor Inputs ¤NIIT Slide 14 Installing Windows XP Professional Using Attended Installation Slide 14 of 19 Ver. 1.0 Querying, Managing, and Administering Databases Using SQL Server 2005 Colla borate Session 9 Does replication resume if a connection is dropped? Yes, replication processing resumes at the point at which it left off if a connection is dropped. FAQs (Contd.) Slide 15 Installing Windows XP Professional Using Attended Installation Slide 15 of 19 Ver. 1.0 Querying, Managing, and Administering Databases Using SQL Server 2005 Colla borate Session 9 Challenge Which of the following editions of SQL Server 2005 allows database snapshots? Standard edition Enterprise edition Express edition Workgroup edition Answer: Enterprise edition [...]... implemented at the server-to-server level Consider an example of a sales organization The inventory data is maintained at the corporate office The regional offices of the organization also have their own servers containing the same data Whenever any change is made at the corporate server, the changes will be replicated to the servers at the regional offices using transactional replication 9.16 Instructor. .. openquery() method Instructor Inputs 9.13 Home Assignment 1 Which of the following is the publisher in replication implementation by using SQL Server 2005? a Database server that replicates the data and database objects b Database objects that are to be replicated c Database data that is replicated d Database server that takes the publication 2 Which of the following creates the snapshot of data in the primary... replicating data in an enterprise In addition, discuss the different replication types and their respective uses Instructor Inputs You can conduct the discussion as follows: Encourage the students to discuss the need for replication in an enterprise Ask the students to discuss the different replication types with the help of different situations in which each replication type is useful Solution Replicating... Replication Merge replication is used when both the publishers as well as the subscribers can change the data In this case, changes are replicated to all the subscribers and publishers until all the servers have the same data Consider an example of a book store, which has various regional offices Every office has its own database server The transaction details at the regional offices need to be synchronized... seconds It provides the BCP GET and BCP SET operations Bulk Import Tool Instructor Inputs 9.15 Collaborative Exercise Replication refers to a set of technologies used for copying and distributing data and database objects from one database to another and then synchronizing the databases to maintain consistency Discuss the need for replicating data in an enterprise In addition, discuss the different replication... change frequently It is also used when the subscribers require read-only data with a high degree of latency time For example, the price list of a sales organization changes once or twice a year In this case, you can replicate the snapshot of the data after it has changed Transactional Replication Transactional replication is used when the subscribers require the updated data with minimal delay Transactional... Collaborate Session 9 Ver 1.0 Slide 18 of 19 Slide 19 Querying, Managing, and Administering Databases Using SQL Server 2005 Installing Windows XP Professional Using Attended Installation Challenge (Contd.) Which of the following method is used to query against a linked server? openlink() openquery() createquery() createlink() Answer: openquery() Ver 1.0 9.12 Instructor Inputs Collaborate Session 9 Slide... through a snapshot Create snapshot on the same server instance as the source database Answer: Drop files from database snapshot Ver 1.0 NIIT Collaborate Session 9 Slide 17 of 19 Instructor Inputs 9.11 Slide 18 Querying, Managing, and Administering Databases Using SQL Server 2005 Installing Windows XP Professional Using Attended Installation Challenge (Contd.) Which of the following command reverts back a... used to copy the SQL Server data to or from an operating system data file c It provides the BCP GET and BCP SET operations d BCP parameters are case-sensitive 10 Which of the following tool/command is not used to import and export data in SQL Server 2005? a SSIS Tool b BCP Utility c OPENROWSET Function d Bulk Import Tool Solutions 1 2 3 4 5 6 7 8 9 10 NIIT Database server that replicates the data and... Distribution replication 6 Consider the following stages of a replication process: a Configuring a publisher and distributor b Identifying a publication c Initializing replication Which stage is missing in the preceding list of stages of a replication process? a Creating and initializing the publisher b Creating and initializing subscriptions c Creating subscriptions 9.14 Instructor Inputs NIIT d Initializing . Instructor Inputs Session 9 ¤NIIT Instructor Inputs 9. 3 This session includes the following topics:  Linked servers  Types of replication  Monitoring. of the session ID. The KILL statement can also be used to terminate a normal connection, which internally terminates the transactions that are associated with the specified session ID. The. is: KILL { session ID } [ WITH STATUSONLY ] where, session_ ID is the session ID of the process to terminate. session_ ID is a unique integer that is assigned to each user connection when the connection