uCertify Articles » MCTS SQL Server 2005 http://www.ucertify.com/article Just another WordPress weblog Wed, 04 Nov 2009 00:00:00 +0000 http://wordpress.org/?v=2.8.4 en hourly 1 Replication http://www.ucertify.com/article/replication_3601460-2.html http://www.ucertify.com/article/replication_3601460-2.html#comments Tue, 29 Sep 2009 00:00:00 +0000 uCertify 3601460

Replication is a type of configuration used to copy data and database objects from one database instance to another. A database administrator has to configure a server for replication, and monitor it in order to detect and resolve issues regarding replication.

Requirements for replication: The following roles are required for replication configuration:

  • Distributor: The server that is configured to the Distributor role distributes data to Subscribers. It creates tables and files to store the data for replication. The computer to be used as a Distributor should have a large amount of storage space.

  • Publisher: The server that is configured to the Publisher role stores data for replication. It detects data changes and maintains information about all publications.

  • Subscriber: The server that is configured to the Subscriber role receives data published by either Publisher or Distributor. The Subscriber configuration depends on the type of replication chosen to replicate data. Each replication type should have a different configuration for a Subscriber.

Replication objects: After the configuration of Publisher, Distributor, and Subscriber servers, various objects are needed to replicate the data. These objects are as follows:

  • Article: Article is an object that includes various database objects such as tables, views, stored procedures, etc. Each of the database objects can be selected as an article. All the articles are combined to create a publication.

  • Publication: Publication is a combination of articles. The data to be received by the Subscriber is sent as a publication. An article must be placed in a publication in order to send the data to the Subscriber.

  • Subscription: Subscription receives the publication sent by the Publisher or Distributor. Subscription is of the following two types:
    • Push subscription: A push subscription is created at the Publisher. Data is pushed to the Subscribers by the Merge or the Distribution agent.

    • Pull subscription: A pull subscription is created at the Subscriber. Data is pulled by the Merge or the Distribution agent from the Publisher.

Replication Models: A DBA has to decide the type of replication model before replicating the data. He has to decide the configuration for the Publisher, Distributor, and Subscriber databases. The following replication models can be applied before data replication:

  • Peer-to-Peer: It is a type of replication model in which a single database is hosted by multiple servers. The purpose of this model is to maintain a database and manage database failures. If a server containing the database is unavailable, the applications can access the data through other servers hosting the database.

  • Central Publisher: The Central Publisher is a replication model in which the Publisher and the Distributor roles are maintained on the same SQL Server 2005/2008 computer. The Subscriber role is configured on other servers. The maintenance of the server is easy, but it adds additional load on the server.

  • Central Publisher with Remote Distributor: The Central Publisher with Remote Distributor is a replication model in which the Publisher and the Distributor roles are maintained on separate SQL Server 2005/2008 computers. The Subscriber role is configured on other servers. The workload of the Publisher server is distributed, but an additional Distributor server is to be maintained.

  • Central Subscriber: Central Subscriber is a replication model in which the Subscriber role is configured on a single server. It is used to collect data from several Publisher servers. It can also be configured to send data to other servers.

  • Publishing Subscriber: Publishing Subscriber is a replication model in which data is obtained from a Publisher and transferred to other Subscribers. This replication model can be used with other replication models for the replication of data.

Types of replication: There are different types of replication and a DBA has to choose which type of replication he needs to configure. Some applications need only a snapshot of the database, whereas others need incremental data changes. The different types of replication are as follows:

  • Transactional Replication: Transactional replication starts with a snapshot of the Publication database objects and data. The modifications made in the data and in the schema are delivered to the Subscriber database, simultaneously. Transactional replication is used in a server-to-server environment in the following conditions:

    • When a Publisher or Subscriber is a non-SQL Server database, such as Oracle.

    • When incremental changes are to be made at the Subscriber.

    • When an application requires low latency.

    • When an application requires access to data changes.

    • When the Publisher has a high volume of insert, update, or delete operations.
  • Merge Replication: Merge replication starts with a snapshot of the Publication database. Triggers track the modifications in the data and the schema at the Publisher or the Subscriber server. Merge replication is performed in a server-to-client environment. It should be performed in the following conditions:
    • When same data is to be updated by multiple Subscribers.

    • When data changes are to be propagated to the Publisher and other Subscribers.

    • When offline data changes are to be synchronized on the Publisher and other Subscribers.

    • When conflicts are to be detected and resolved.

    • When each Subscriber needs different partitions of data.

    Merge replication does not take place if a Publisher or Subscriber is a non-SQL Server database.

  • Snapshot Replication: Snapshot replication distributes data at a specific moment. It does not monitor the modifications in data or schema. The entire snapshot is sent to Subscribers when synchronization occurs. The snapshot replication can be performed in the following conditions:
    • When data changes infrequently.

    • When small volumes of data are to be replicated.

    • When large volumes of changes occur over a short period of time.

    It does not take place when a Publisher or a Subscriber is a non-SQL Server database.

Replication Agents: Replication agents are used during the replication of data. They store data published by a Publisher. They also initialize and monitor the replication. Replication agents are as follows:

  • Queue Reader Agent: The Queue Reader agent runs with a transactional replication. It runs at the Distributor database and transfers the changes from the Subscribers to the Publisher database. Only one instance of this agent exists to serve all the Publishers.

  • Snapshot Agent: The Snapshot agent is used with all types of replication. It is used to prepare snapshot files that contain the schema and the data of published tables and database objects in the publication database. It also records synchronization jobs in the distribution database. It runs at the Distributor database instance.

  • Log Reader Agent: The Log Reader agent is used with a transactional replication. It is used to monitor the transaction log of each database configured for transactional replication. It copies the transactions that are marked for replication to the Distribution database.

  • Distribution Agent: The Distribution agent is used with transactional and snapshot replications. It is used in a transactional replication to move transaction files and data to the Subscribers database. It runs at the Subscribers database for pull subscriptions or at the Distributors database for push subscriptions.

  • Merge Agent: The Merge agent is used with the merge replication. It applies the snapshot to the Subscriber database instance, and the changes in the Subscriber are reflected in the Publisher database. The Merge agent uploads data changes from Subscribers to Publishers, and downloads data from Publishers to Subscribers.
Share/Bookmark]]> http://www.ucertify.com/article/replication_3601460-2.html/feed 0 How to change the authentication mode of a database server? http://www.ucertify.com/article/how-to-change-the-authentication-mode-of-a-database-server_5608464.html http://www.ucertify.com/article/how-to-change-the-authentication-mode-of-a-database-server_5608464.html#comments Sat, 12 Sep 2009 00:00:00 +0000 uCertify 5608464 Download practice question and study guide for mcitp-database-administrator for exam. Website : http://www.mkyong.com Get certified in first attempt download mcp - MCP simulation. -->

Take the following steps to change the authentication mode of a database server:

  1. Run SQL Server Management Studio from Start > Programs > Microsoft SQL Server 2005 > SQL Server Management Studio.

  2. In the Connect to Server window, click the Connect button.

  3. In the Microsoft SQL Server Management Studio window, right-click the server and click the Properties option.

  4. On the Server Properties dialog box, click the Security page. Select SQL Server and Windows Authentication mode radio button. Click the OK button.

  5. In the Microsoft SQL Server Management Studio window, right-click the server and click the Restart option.

      6. Get certified in first attempt download mcts-sql-server-2005 - MCTS SQL Server 2005 simulation. Get certified in first attempt download 70-447 - SQL Server 2005 Design simulation. Share/Bookmark]]> http://www.ucertify.com/article/how-to-change-the-authentication-mode-of-a-database-server_5608464.html/feed 0 How to create a role? http://www.ucertify.com/article/how-to-create-a-role_5608468.html http://www.ucertify.com/article/how-to-create-a-role_5608468.html#comments Sat, 12 Sep 2009 00:00:00 +0000 uCertify 5608468 Pass MCITP Database Administrator in first attampt. Website : http://www.mkyong.com Best exam simulation Microsoft mcp download free trial. -->

      Take the following steps to create a role:

      1. Run SQL Server Management Studio from Start > Programs > Microsoft SQL Server 2005 > SQL Server Management Studio.

      2. In the Connect to Server window, click the Connect button.

      3. In the SQL Server Management Studio window, double-click the Databases folder.

      4. In the SQL Server Management Studio window, double-click the database in which role is to be created.

      5. In the SQL Server Management Studio window, right-click the Security folder and select the New > Database Role option.

      6. In the Database Role dialog box, mention the name and owner of the role and click the OK button.

      .

      Pass MCTS SQL Server 2005 in first attampt. Get certified in first attempt download 70-447 - SQL Server 2005 Design simulation. Share/Bookmark]]>       http://www.ucertify.com/article/how-to-create-a-role_5608468.html/feed 0       Note for creating a role http://www.ucertify.com/article/note-for-creating-a-role.html http://www.ucertify.com/article/note-for-creating-a-role.html#comments Sat, 12 Sep 2009 00:00:00 +0000 uCertify 5608469 Get certified in first attempt download mcitp-database-administrator - MCITP Database Administrator simulation. Website : http://www.mkyong.com Click here to get free mcp MCP exam practice questions. -->

      Before a role is created, the owner of the role should be added to the required database. If this is not done, an error occurs and the role is not created. The user can be added to the database through the Security page in the Database Properties dialog box.

      Download free practice test for Microsoft MCTS SQL Server 2005 exam. Click here to get free 70-447 SQL Server 2005 Design exam practice questions. Share/Bookmark]]>       http://www.ucertify.com/article/note-for-creating-a-role.html/feed 0       Study Tips for Microsoft test 70-447 http://www.ucertify.com/article/study-tips-for-microsoft-test-70-447.html http://www.ucertify.com/article/study-tips-for-microsoft-test-70-447.html#comments Fri, 11 Sep 2009 00:00:00 +0000 uCertify 5608456 Click here to get free mcitp-database-administrator MCITP Database Administrator exam practice questions. Website : http://www.mkyong.com Download free practice test for mcp MCP exam. -->

      The objective of Microsoft test 70-447 is to measure your ability to install and manage database servers and databases to test the skills of a user, and to optimize, manage, and administer the SQL Server 2005 databases. Your capability of database designing and administration are also measured. You should be able to work with different tools present in SQL Server 2005 to create and manage databases. Before taking the test, you should remember the following study tips:

      1. Always remember that the System Monitor tool is used to measure the counters of database servers and databases.

      2. Always remember that the counter values give you an idea of whether to upgrade or replace a hardware resource.

      3. Always remember that the storage and performance of a database can be improved by using different levels of RAIDs.

      4. Always remember that SQL Server Management Studio is used to create and manage a database and database objects.

      5. Always remember that SQL Server 2005 have different editions.

      6. Always remember that a server having SQL Server 2005 Enterprise Edition can have fifty instances of SQL Server 2005.

      7. Always remember that roles and permissions should be used to secure the database server from external and internal attacks.

      8. Always remember that server-level, database-level, and schema-level security can be used to protect the server and the database.

      9. Always remember that tables should have a primary key and foreign key relationship to retrieve data from more than one table.

      10. Always remember that the traces can be used to view the cause of locks and deadlocks.

      11. Always remember that Dynamic Management Views (DMVs) are used to view and resolve the issues related to different database objects such as tables, indexes, stored procedures, views, and triggers, etc.

      12. Always remember that SQL Server Profiler provides event classes that are used to trace events occurring in SQL Server.

      13. Always remember that transactions fail due to locks and deadlocks.

      14. Always remember that locks and deadlocks are caused due to unavailable resources.

      15. Always remember that traces can be created and managed through SQL Server Profiler.

      16. Always remember that Backup and Restore processes help recover damaged databases and their objects.

      17. Always remember that Failover Clustering helps maintain the performance in case a server in the cluster fails.

      To derive maximum value from the uCertify PrepKit, you should take a diagnostic test and find out your weak areas. Read all the study notes and remove your weaknesses. Use the uCertify PrepKit several times for the preparation of the test. Buy the PrepKit with 200+ questions and 100+ study notes. Practice all the tests several times until you get 100% in all the tests.

      Pass Microsoft mcts-sql-server-2005 - MCTS SQL Server 2005 Download free practice test for Microsoft SQL Server 2005 Design exam. Share/Bookmark]]>       http://www.ucertify.com/article/study-tips-for-microsoft-test-70-447.html/feed 0       Things to practice for Microsoft test 70-447 http://www.ucertify.com/article/things-to-practice-for-microsoft-test-70-447.html http://www.ucertify.com/article/things-to-practice-for-microsoft-test-70-447.html#comments Fri, 11 Sep 2009 00:00:00 +0000 uCertify 5608457 Best exam simulation Microsoft mcitp-database-administrator download free trial. Website : http://www.mkyong.com Best exam simulation Microsoft mcp download free trial. -->

      The Microsoft test 70-447 measures your ability to design the infrastructure of database servers and databases, and to optimize, manage, and administer SQL Server databases. It covers a range of database technologies. You must understand the ways of planning to install database servers and databases, and know about the cost of hardware and software resources to develop the infrastructure. You should also consider the security of the database servers and usage of SQL Server services and objects. It requires you to have a good knowledge of the SQL Server objects and troubleshooting issues related to SQL Server. Before taking the 70-447 test, you should practice the following:

      1. Use capacity planning to plan the infrastructure.

      2. Know the hardware and the software resources to be used.

      3. Know the installation of the default and named instances.

      4. Analyze the security requirements on the basis of server-level, database-level, and schema-level.

      5. Know the procedures for creating databases and database objects.

      6. Know the strategy for creating high-availability for a business.

      7. Know replication and its types.

      8. Know about database mirroring.

      9. Know about log shipping.

      10. Know about the different data recovery models.

      11. Know about the different types of replication topologies.

      12. Know about the backup and restore processes.

      13. Know about the different modes of backing up a database.

      14. Understand the usage of System Monitor.

      15. Manage counters and performance logs.

      16. Understand the usage of SQL Server Profiler.

      17. Understand the usage of Dynamic Management Views.

      18. Create and maintain statistics.

      19. Maintain transaction logs.

      20. Know the usage of Query Editor.

      21. Analyze queries using Graphical Execution Plan.

      22. Create and manage a trace.

      23. Trigger events and notification processes.

      24. Use different tools and services of SQL Server to diagnose database problems.

      25. Understand Failover Clustering.

      26. Understand Database Mirroring.

      27. Restore system databases.

      28. Understand snapshots.

      29. Use reporting services.

      30. Understand linked servers.

      31. Configure a linked server.

      32. Use SQL Server integration services.

      33. Secure databases.

      34. Understand Denial of Service attacks.

      35. Resolve Denial of Service attacks.
      Click here to download mcts-sql-server-2005 test study guide and practice question. Get certified in first attempt download 70-447 - SQL Server 2005 Design simulation. Share/Bookmark]]>       http://www.ucertify.com/article/things-to-practice-for-microsoft-test-70-447.html/feed 0       Note for SQL Server Editions http://www.ucertify.com/article/note-for-sql-server-editions.html http://www.ucertify.com/article/note-for-sql-server-editions.html#comments Fri, 11 Sep 2009 00:00:00 +0000 uCertify 5608458 Download free practice test for mcitp-database-administrator MCITP Database Administrator exam. Website : http://www.mkyong.com Download free practice test for mcp MCP exam. -->

      The following query is used to know about the currently installed SQL Server Edition on a computer:

      SELECT SERVERPROPERTY(’edition’)

      Become Microsoft MCTS SQL Server 2005 certified. Download practice question and study guide for 70-447 for exam. Share/Bookmark]]>       http://www.ucertify.com/article/note-for-sql-server-editions.html/feed 0       What is Database Engine Tuning Advisor? http://www.ucertify.com/article/what-is-database-engine-tuning-advisor.html http://www.ucertify.com/article/what-is-database-engine-tuning-advisor.html#comments Thu, 03 Sep 2009 00:00:00 +0000 uCertify 7101039

      Database Engine Tuning Advisor is a tool that tunes a database for better query performance by analyzing a workload that is a set of T-SQL statements. It suggests clustered indexes, nonclustered indexes, indexed views, and partitioning. Database Engine Tuning Advisor in SQL Server 2005 replaces the Index Tuning Wizard of SQL Server 2000. This tool provides two user interfaces: a graphical user interface (GUI) and the dta command prompt utility.

      Share/Bookmark]]>       http://www.ucertify.com/article/what-is-database-engine-tuning-advisor.html/feed 0       What is the binary datatype? http://www.ucertify.com/article/what-is-the-binary-datatype.html http://www.ucertify.com/article/what-is-the-binary-datatype.html#comments Tue, 01 Sep 2009 00:00:00 +0000 uCertify 5608380

      The binary datatype is a fixed-length non-Unicode datatype. It is used to store binary data. It uses a fixed amount of memory. The usage of memory does not depend on the size of file in bytes present in a field having the binary datatype. The definition of the binary datatype is as follows:

      binary(n)

      Here, n refers to the size of file present in a field having the binary datatype. The maximum length of this datatype is 8000.

      Share/Bookmark]]>       http://www.ucertify.com/article/what-is-the-binary-datatype.html/feed 0       How to disable recursion of trigger through Server Properties dialog box? http://www.ucertify.com/article/how-to-disable-recursion-of-trigger-through-server-properties-dialog-box_5608382.html http://www.ucertify.com/article/how-to-disable-recursion-of-trigger-through-server-properties-dialog-box_5608382.html#comments Tue, 01 Sep 2009 00:00:00 +0000 uCertify 5608382

      Take the following steps to disable recursion of trigger through Server Properties dialog box:

      1. Run SQL Server Management Studio from Start > Programs > Microsoft SQL Server 2005 > SQL Server Management Studio.

      2. In the Connect to Server window, click the Connect button.

      3. In the SQL Server Management Studio window, right-click the server and click the Properties option.

      4. In the Server Properties dialog box, set the Allow Triggers to Fire Others property to False. Click the OK button.

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