PostgreSQL - REVOKE

PostgreSQL – REINDEX

Last Updated : 24 Jul, 2024

The PostgreSQL REINDEX statement is essential for recovering corrupted indexes, which can occur due to software bugs or hardware failures. Here, we will learn the syntax, usage, and a practical example to ensure you understand how to use this statement effectively in PostgreSQL.

Syntax

REINDEX [ ( VERBOSE ) ] { INDEX | TABLE | SCHEMA | DATABASE | SYSTEM } name;

Parameters:

1. VERBOSE Keyword: The VERBOSE keyword is optional and provides a progress report while reindexing. It is useful for monitoring the reindexing process.

2. INDEX: To rebuild a single index, specify the index name after the REINDEX INDEX clause:

REINDEX INDEX index_name;

3. TABLE: To rebuild all the indexes of a table, we can make use of the TABLE keyword as shown below:

REINDEX TABLE table_name;

4. SCHEMA: For rebuilding all indices in a schema, one can make use of the SCHEMA keyword as shown below:

REINDEX SCHEMA schema_name;

5. DATABASE: To recover all indices in a specific database, you need to set the database name after the REINDEX DATABASE clause as shown below:

REINDEX DATABASE database_name;

6. SYSTEM: The following statement can be used to recover all indices on system catalogs from a specific database:

REINDEX SYSTEM database_name;

PostgreSQL REINDEX Statement Example

Let us take a look at an example of the REINDEX Statement in PostgreSQL to better understand the concept.

In this example we will build a REINDEX for the customer table in the sample database:

REINDEX TABLE customer;

Output:

PostgreSQL REINDEX Statement Example

Explanation: The command will rebuild all indexes on the customer table, ensuring they are not corrupted and are functioning optimally.

Important Points About PostgreSQL REINDEX Statement

The REINDEX statement is used to rebuild corrupted indexes, which can result from software bugs, hardware failures, or disk issues.

The VERBOSE keyword is optional but highly useful for displaying progress and detailed information about the reindexing process.

Reindexing can be resource-intensive and may significantly impact database performance.

The REINDEX operation locks the affected table or index, preventing other operations from accessing it during the process.

PostgreSQL - REVOKE

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