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Database-PostgreSQL

Chapter 11. Indexes

Chapter 11. Indexes

Table of Contents

11.1. Introduction
11.2. Index Types
11.2.1. B-Tree
11.2.2. Hash
11.2.3. GiST
11.2.4. SP-GiST
11.2.5. GIN
11.2.6. BRIN
11.3. Multicolumn Indexes
11.4. Indexes and ORDER BY
11.5. Combining Multiple Indexes
11.6. Unique Indexes
11.7. Indexes on Expressions
11.8. Partial Indexes
11.9. Index-Only Scans and Covering Indexes
11.10. Operator Classes and Operator Families
11.11. Indexes and Collations
11.12. Examining Index Usage

Indexes are a common way to enhance database performance. An index allows the database server to find and retrieve specific rows much faster than it could do without an index. But indexes also add overhead to the database system as a whole, so they should be used sensibly.

Chapter 11. Indexes

Chapter 11. Indexes

Table of Contents

11.1. Introduction
11.2. Index Types
11.2.1. B-Tree
11.2.2. Hash
11.2.3. GiST
11.2.4. SP-GiST
11.2.5. GIN
11.2.6. BRIN
11.3. Multicolumn Indexes
11.4. Indexes and ORDER BY
11.5. Combining Multiple Indexes
11.6. Unique Indexes
11.7. Indexes on Expressions
11.8. Partial Indexes
11.9. Index-Only Scans and Covering Indexes
11.10. Operator Classes and Operator Families
11.11. Indexes and Collations
11.12. Examining Index Usage

Indexes are a common way to enhance database performance. An index allows the database server to find and retrieve specific rows much faster than it could do without an index. But indexes also add overhead to the database system as a whole, so they should be used sensibly.

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3.7. Conclusion

3.7. Conclusion

PostgreSQL has many features not touched upon in this tutorial introduction, which has been oriented toward newer users of SQL . These features are discussed in more detail in the remainder of this book.

If you feel you need more introductory material, please visit the PostgreSQL web site for links to more resources.

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3.7. Conclusion

3.7. Conclusion

PostgreSQL has many features not touched upon in this tutorial introduction, which has been oriented toward newer users of SQL . These features are discussed in more detail in the remainder of this book.

If you feel you need more introductory material, please visit the PostgreSQL web site for links to more resources.

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53.59. pg_ts_config

53.59. pg_ts_config

The pg_ts_config catalog contains entries representing text search configurations. A configuration specifies a particular text search parser and a list of dictionaries to use for each of the parser's output token types. The parser is shown in the pg_ts_config entry, but the token-to-dictionary mapping is defined by subsidiary entries in pg_ts_config_map .

PostgreSQL 's text search features are described at length in Chapter 12.

Table 53.59. pg_ts_config Columns

Column Type

Description

oid oid

Row identifier

cfgname name

Text search configuration name

cfgnamespace oid (references pg_namespace . oid )

The OID of the namespace that contains this configuration

cfgowner oid (references pg_authid . oid )

Owner of the configuration

cfgparser oid (references pg_ts_parser . oid )

The OID of the text search parser for this configuration


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53.59. pg_ts_config

53.59. pg_ts_config

The pg_ts_config catalog contains entries representing text search configurations. A configuration specifies a particular text search parser and a list of dictionaries to use for each of the parser's output token types. The parser is shown in the pg_ts_config entry, but the token-to-dictionary mapping is defined by subsidiary entries in pg_ts_config_map .

PostgreSQL 's text search features are described at length in Chapter 12.

Table 53.59. pg_ts_config Columns

Column Type

Description

oid oid

Row identifier

cfgname name

Text search configuration name

cfgnamespace oid (references pg_namespace . oid )

The OID of the namespace that contains this configuration

cfgowner oid (references pg_authid . oid )

Owner of the configuration

cfgparser oid (references pg_ts_parser . oid )

The OID of the text search parser for this configuration


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