Скачать или смотреть How to Query Tablespace in Oracle

Learn how to query tablespace in Oracle to manage database storage efficiently. Explore SQL queries to retrieve information about tablespaces, including size, usage, and allocation.
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When managing a database in Oracle, understanding tablespaces is essential for efficient storage management. Tablespaces are logical storage units where database objects such as tables and indexes reside. To query tablespaces in Oracle and gather important information about their size, usage, and allocation, you can execute SQL queries against the data dictionary views. Below are the steps to query tablespace information in Oracle:

Viewing Tablespace Names and IDs:
To retrieve a list of all tablespaces along with their respective IDs, you can query the DBA_TABLESPACES view:

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Checking Tablespace Size and Allocation:
You can obtain information about the size and allocation of each tablespace using the DBA_DATA_FILES view:

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This query provides details such as the tablespace name, file name, size in megabytes, and whether the file is autoextensible.

Monitoring Tablespace Usage:
To monitor the usage of tablespaces and their respective segments, you can query the DBA_SEGMENTS view:

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This query helps identify the types and number of segments present in each tablespace, such as tables, indexes, and partitions.

Checking Tablespace Free Space:
To determine the amount of free space available in each tablespace, you can query the DBA_FREE_SPACE view:

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This query calculates the total free space available in each tablespace in megabytes.

By executing these SQL queries against the relevant data dictionary views in Oracle, you can effectively query and manage tablespaces to ensure optimal storage utilization and performance for your database.