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The document provides a comprehensive overview of indexes in Microsoft SQL Server 2000, explaining their purpose, types, and implementation. It compares database indexes to book indexes, highlighting how they facilitate quick data retrieval without scanning entire tables. The document details the structure of indexes, including B-trees, and discusses the performance benefits and costs associated with using indexes. It also covers the creation and management of indexes, including unique and clustered indexes, as well as guidelines for designing effective indexing strategies. Additionally, it includes syntax for creating indexes and examples demonstrating their use.

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Can we CREATE INDEX in hive?

Indexing is a relatively new feature in Hive. In the Hive, the index table is different than the main table. Indexes facilitate making query execution or search operation faster. However, storing indexes requires disk space, and creating an index involves cost.

How to create an index in a database?

The CREATE INDEX command enables us to create an index on a table, improving query performance by providing a faster way to retrieve rows. indexname: The name of the index. tablename: The name of the table on which the index is created. column1, column2, : The columns that the index will be applied to.

How to create an index in Oracle DB?

Create a Function-Based Index in Oracle We use Function-Based indexes to improve the performance of queries that contain functions in the WHERE clauses. To tell Oracle create function based index on your table, use the below syntax: CREATE [UNIQUE] INDEX indexname ON tablename (function1, function2, functionN);

How is an index created?

Constructing an index starts with deciding what type of securities to include. An index can include equities, fixed income, real estate, commodities, currencies and even other alternative investments such as private equity and hedge funds. The index provider may also want to focus on a subset.

How to formulate an index?

Preparing Your Index Choose your indexing source. Decide what needs to be indexed. List cited authors if necessary. Create index cards for entries if youre indexing by hand. Use nouns for the main headings of entries. Include subentries for entries with 5 or more pointers. Identify potential cross references.

What is an example of an index in a database?

For example, an index could be created on upper(lastname) , which would only store the upper-case versions of the lastname field in the index. Another option sometimes supported is the use of partial index, where index entries are created only for those records that satisfy some conditional expression.

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