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7: Optimizing Databases
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4 Use the following script to create a full-text catalog on the AdventureWorks database
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USE AdventureWorks; CREATE FULLTEXT CATALOG ftCatalog as DEFAULT
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5 The HumanResourcesJobCandidate table has a Resume column of data type XML Before we can create the full-text index on it, we need to identify the name of the index on the PK Using the SSMS Object Explorer, browse to the indexes in the HumanResourcesJobCandidate table to identify the name You can see this in Figure 7-21
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Figure 7-21 Identifying the index name using the Object Browser in SSMS
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6 Use the following script to create the full-text index on the HumanResources JobCandidate table using the existing PK:
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CREATE FULLTEXT INDEX ON HumanResourcesJobCandidate(Resume) KEY INDEX PK_JobCandidate_JobCandidateID;
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7 Now we can query the data within the table Suppose we re looking for a candidate with mechanical engineering experience Execute the following query to find that person:
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SELECT * FROM HumanResourcesJobCandidate WHERE CONTAINS(Resume, ' "mechanical engineering" ');
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8 Imagine we are looking for all job candidates with experience in selling To ensure we get all possible candidates no matter what verb tense of the word sell is used in the column (sell, sold, selling), we can specify FORMSOF and INFLECTIONAL The following query will return all verb tenses of sell and sale:
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SELECT * FROM HumanResourcesJobCandidate WHERE CONTAINS(Resume, ' FORMSOF (INFLECTIONAL, sell, sale) ');
Database Engine Tuning Advisor (DTA)
For a complex database with dozens or hundreds of tables, it isn t so easy to identify the best indexes to create The Database Engine Tuning Advisor (DTA) can be used to provide a little more science to this monumental task
MCITP SQL Server 2005 Database Developer All-in-One Exam Guide
The DTA replaces the Index Tuning wizard from SQL Server 2000 It can be used to:
Recommend indexes (clustered and nonclustered) to create Recommend indexes to drop Recommend indexed VIEWs Analyze the effects of the proposed changes Provide reports summarizing the changes and the effects of the changes
Setup and Configuration
You can launch DTA from SSMS It can be selected from the Tools drop-down menu Once you launch it, you will be prompted to identify the instance you want to connect with You will then see a display similar to Figure 7-22
Figure 7-22
Database Engine Tuning Advisor
If you ve run DTA before, the previous results will appear in the left pane At any time you can review the recommendations from previous runs In the right pane, DTA starts in the General properties page The session name defaults to the username and the date and time the session was created
7: Optimizing Databases
Workload
The workload is what we are measuring It is a set of T-SQL statements that is executed against the database we are tuning Workloads can be derived from trace files or trace tables, a T-SQL script file, or XML files In many environments where a production server exists that can t be taken offline, a test bed is created Ideally, this server will have similar hardware and up-to-date databases (created from recent backups) We ll cover SQL Profiler in 13, but one of the things we can do is run SQL Profiler on a test server and capture all the activity on an instance of a production server Each statement executed against the production server can be captured and then saved in either a trace file or trace table If you do this during live activity, you can create a file duplicating actual activity on your production server This is a realistic workload file One of the drawbacks of files captured with SQL Profiler is that the files can be quite large This is one of the reasons we d save it on a test bed server Executing DTA on the production server with this large trace file might cause it to bog down So instead we d execute DTA on the test server
Tuning Options
This page is divided into three sections
Physical Design Structures (PDS) in use database This allows you to choose which indexes and/or indexed VIEWs to recommend TIP The first time I came across the phrase Physical Design Structures (PDS), I spent a good deal of time trying to define it To save you some searching, Physical Design Structures are simply indexes and indexed VIEWs
Partitioning strategy to employ Here you can allow the DTA to recommend partitioning Partitioning strategies can be recommended based on two different goals: performance or maintenance: Full partitioning will recommend partitions for the best performance of the workload Aligned partitioning will recommend partitions with the added goal of making the partitions easy to maintain Physical Design Structures to keep in the database You can specify whether you want existing indexes or indexed VIEWs to be kept
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