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Lesson 1: Choosing a Database

Lesson 2: Planning a Search Strategy

Lesson 3: Using Dialog Search Commands

Lesson 4: Managing Search Results

Lesson 5: Refining a Search (Part 1)

Lesson 6: Refining a Search (Part 2)

Lesson 7: Wrapping Up the Course

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About the Databases

Step 2: Determine which database(s) will provide the best information.

Dialog has over 450 databases, ranging from directories containing data about companies to those providing trade journal coverage from the popular press. Each database is identified by a unique number. For example, MEDLINE^® is File 155.

A listing of all databases is provided on Dialog's Web site at http://library.dialog.com/bluesheets/. We will also see a link to the database listing on the main page of DialogWeb.

Note: We will use the DialogWeb interface for DIALINDEX since it is easy to use and can be used for free via the Web.

Brian's request does not give us too much to go on except that he wants the information from medical journals. DialogWeb divides its databases into categories to make choosing one easy. On DialogWeb medical, life sciences, and pharmaceutical information is listed under Medicine and Pharmaceuticals category.

This category is further divided into Research and Development, which includes such topics as Biological Sciences, Medicine, and Alternative Medicine, to name a few. This category sounds like the right place for Brian's search.

Keep in mind these "4 Cs" to evaluate the databases: Content, Coverage, Currency, and Cost.

Databases selection tools

Dialog offers extensive documentation on database content and Dialog search features. Two important resources to check are:

The Dialog Database Catalog.
Databases selection tool, known as DIALINDEX.

Go to the next page to see how we can use Dialog's databases selection tool to select possible databases for Brian's search.

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Learn More #2:

Databases that include coverage on research and development in medical literature and pharmaceuticals include:

MEDLINE® (File 155)
EMBASE® (Excerpta Medica) (File 72)
BIOSIS Previews® (File 5).

Learn More #3:

The following information will help us as we look at the different databases on Dialog:

C ontent

Subject content (industry overview, product information, executive data, etc.)
Sources: where the data comes from (newspapers, company interviews, trade publications)
Record content: exactly what data is in a record (such as a news article)—text, abstracts, numerical data, market research, etc.
Intended audience: what technical level is presented (technical research about a product, market research about an industry)

C overage

Size of the database (number of records, which years are covered)
Scope of coverage (national or international, number of journals, types of companies included)

C urrency

How often is the file updated (daily, weekly, monthly, every fifteen minutes)
Timeliness: what is the lag time (newswires, published or unpublished data)

C ost

How much can you expect to pay for exactly what you need (per record charges)

Learn More #4:

The Dialog Database Catalog contains a comprehensive listing of the databases currently available on Dialog. It contains brief descriptions of all databases, including subject categories and dates of coverage. A subject index is also included.

For some databases the database name provides a good indication of its subject content like the database, MEDLINE®, File 155. However, many files have names that are unfamiliar, for example the database EMBASE®, File 72. The database descriptions in the main body of the catalog help us learn about their coverage and content.

We will also look in more detail at other Dialog documentation on databases in Lessons 5 and 6 when we look at Dialog Bluesheets.