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Orin Thomas The key to diagnosing problems with a database is being methodical, patient, and observant. When you observe a failure, you usually have suspicions about what might have caused it. Write your suspicions down and then try to think of what evidence might exist that directly confirms or contradicts your current hypothesis. Trawling log files is a lot easier if you have something specific in mind.

This section has discussed how the CLR functions, when to consider using CLR code, how transactions function, and how to obtain various management statistics related to the SQL CLR.

After extracting the schema and all the data, the Snapshot Agent shuts down. The Dis tribution Agent then picks up and applies the snapshot to each subscriber. During this process, existing tables are dropped and re-created from the schema scripts in the snap shot folder; then the data is bulk copied (using BCP) into the tables on each subscriber.

By default, a snapshot applies the table structure, primary key, clustered index, unique constraints, and data to the subscriber. All other objects related to a table, such as check constraints and for eign key constraints, are not sent. You can override default snapshot behavior by modifying the article properties. There are four options available when applying a snapshot. The default option is to drop the exist ing object and re-create it. You can also choose to keep the existing table unchanged, delete data that matches the incoming snapshot, or leave the table structure intact but truncate the table to accept just the data from the snapshot. This chapter assumes that you are leaving the article properties set to the default options.

The storage engine is another important aspect of SQL Server 2005 for developers to master. SQL Server 2005 ultimately reads and writes data to disk. The storage engine is the component that is responsible for the management of the task of reading and writing data across all databases in the SQL Server instance. The storage engine has been designed to be invisible to the user in that they are not aware of its existence, except, of course, when something goes wrong. The storage engine is responsible for the following tasks:

A diagram of the process of moving data via snapshot replication is shown in Figure 11-3.

This lesson concentrates on the tools that you can use to diagnose database failures. Primarily, you diagnose a database failure through examining log files for specific events related to the failure. The lesson covers the different ways that you can view log files and also examines what sort of evidence you find if one of the more common database failures occurs on a server that you are responsible for managing.

Snapshot replication performs a full replace of data on the subscriber. It is not nor mally used for high availability because any transactions issued between applications of a snapshot are not sent to the subscriber.

Managing physical data and log files on the disk subsystem Reading data from database storage files and loading it into buffer cache Reading data from buffer cache and storing it to disk Tracking atomicity of all transactions Writing transaction log data to the log file Ensuring the data is in a consistent state when the instance starts Performing database backup operations when instructed Performing database restore operations when instructed Miscellaneous file-management tasks

11

As you can see, the database storage engine is a very busy component within the SQL Server 2005 architecture. The database storage engine incorporates an industry-standard set of algorithms known as Algorithms for Recovery and Isolation Exploiting Semantics or ARIES. ARIES was first developed in the late 1980s by scientists at IBM and, later, Microsoft incorporated them into SQL Server. Because the database storage engine is based on such mature standards, it is very efficient in its operation.