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Overview
| Comment: | Improvements to VACUUM documentation - describe more clearly when another transaction might block a vacuum. |
|---|---|
| Timelines: | family | ancestors | descendants | both | branch-3.27 |
| Files: | files | file ages | folders |
| SHA3-256: | 0f897a0268b33f51f38356aafeda60ff |
| User & Date: | drh 2019-04-01 14:44:28 |
Context
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2019-04-08
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| 18:08 | Fix a minor error in the datatype documentation. Leaf check-in: 87bef3d123 user: drh tags: branch-3.27 | |
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2019-04-01
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| 14:45 | Merge changes from the 3.27 branch. check-in: 50513b6f28 user: drh tags: trunk | |
| 14:44 | Improvements to VACUUM documentation - describe more clearly when another transaction might block a vacuum. check-in: 0f897a0268 user: drh tags: branch-3.27 | |
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2019-03-25
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| 14:32 | Import typo fixes from trunk. check-in: 6f80f0890f user: drh tags: branch-3.27 | |
Changes
Changes to pages/lang.in.
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named on the INTO clause in place of the temporary database and omits the step of copying the vacuumed database back over top of the original database. <p>^The VACUUM command may change the [ROWID | ROWIDs] of entries in any tables that do not have an explicit [INTEGER PRIMARY KEY]. </p> <p>^A VACUUM will fail if there is an open transaction, or if there are one or more active SQL statements when it is run. <p>^(An alternative to using the VACUUM command to reclaim space after data has been deleted is auto-vacuum mode, enabled using the [auto_vacuum] pragma.)^ ^When [auto_vacuum] is enabled for a database free pages may be reclaimed after deleting data, causing the file to shrink, without rebuilding the entire database using VACUUM. ^However, using [auto_vacuum] can lead to extra database file fragmentation. ^And [auto_vacuum] |
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named on the INTO clause in place of the temporary database and omits the step of copying the vacuumed database back over top of the original database. <p>^The VACUUM command may change the [ROWID | ROWIDs] of entries in any tables that do not have an explicit [INTEGER PRIMARY KEY]. </p> <p>^A VACUUM will fail if there is an open transaction on the database connection that is attempting to run the VACUUM. ^Unfinalized SQL statements typically hold a read transaction open, so the VACUUM might fail if there are unfinalized SQL statements on the same connection. ^VACUUM (but not VACUUM INTO) is a write operation and so if another database connection is holding a lock that prevents writes, then the VACUUM will fail. <p>^(An alternative to using the VACUUM command to reclaim space after data has been deleted is auto-vacuum mode, enabled using the [auto_vacuum] pragma.)^ ^When [auto_vacuum] is enabled for a database free pages may be reclaimed after deleting data, causing the file to shrink, without rebuilding the entire database using VACUUM. ^However, using [auto_vacuum] can lead to extra database file fragmentation. ^And [auto_vacuum] |