vacuum command

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SQLite getting started and Analysis (9)-VACUUM command Analysis

The vacuum command is an extended function of SQLite. It imitates the same commands in PostgreSQL. If VACUUM is called with a table name or index name, the table or index will be sorted. In SQLite 1.0, the VACUUM command calls gdbm_reorganize () to

The vacuum and vacuum full contrast of PostgreSQL

Vacuum commands exist in two forms, vacuum and vacuum full, and the difference between them is shown in the following table: No vacuum VACUUM VACUUM full After deleting large amounts of data Simply

Fixed file size unchanged after SQLite deleted data (VACUUM)

Delete all data from the table:DELETE from [Name]When a large amount of data has been deleted in SQLite, the size of the database file remains the same. The reason: After deleting data from SQLite, unused disk space is added to an intrinsic "free

Quickly implement vacuum full for system tables in PostgreSQL

Vacuum full locks the table and is very inefficient. In practice, vacuum cannot be used to narrow down the pg_class, resulting in a long downtime.In fact, the simplest way to implement vacuum full is to copy a table again, create table B as select *

PostgreSQL Tutorial (14): Database Maintenance _postgresql

First, restore disk space: In PostgreSQL, data rows that are deleted or updated using the Delete and UPDATE statements are not actually deleted, but only the state of the row is deleted or expired on the physical address of the old version of the

PostgreSQL tutorial (14): database maintenance, postgresql tutorial

PostgreSQL tutorial (14): database maintenance, postgresql tutorial I. Disk Space Restoration: In PostgreSQL, the data rows deleted or updated using the delete and update statements are not actually deleted, the physical address of the old data row

PostgreSQL learning Manual (Database Maintenance)

I. Disk Space Restoration: In PostgreSQL, the data rows deleted or updated using the delete and update statements are not actually deleted, the physical address of the old data row sets the row status to deleted or expired. Therefore, when data in a

PostgreSQL Study Notes (12) Database Maintenance

I. restore disk space In PostgreSQL, the data rows deleted or updated using the delete and update statements are not actually deleted, the physical address of the old data row sets the row status to deleted or expired. Therefore, when data in a

PostgreSQL Tutorial (17): Client command (1) _postgresql

0, password file: Before giving other PostgreSQL client commands, we need to introduce the password file in PostgreSQL. The file is explained here in advance because we are applying the file in a lot of the following sample code to ensure that our

How to clean up the work after the SQLite database deletes a large amount of data

Sqlce is too slow to compare the execution speed with SQLite. Therefore, in the next version of the project, replace sqlce with SQLite. After all, SQLite is not used. The results are indeed good. Two points are satisfactory.   First, the execution

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