Struct IncrementalVacuum 

pub struct IncrementalVacuum;

Available on crate feature __sqlite-shared only.

PRAGMA incremental_vacuum, shrinking a database by releasing freelist pages without the full rewrite VACUUM performs.

Some(pages) releases at most that many pages, None the whole freelist. Only a database in AutoVacuumMode::Incremental has anything to release, on any other mode the assignment succeeds and does nothing.

use diesel::sqlite::AutoVacuumMode;
use diesel::sqlite::pragma::{AutoVacuum, IncrementalVacuum, SchemaPragma};
use std::num::NonZeroU32;

let conn = &mut SqliteConnection::establish(":memory:").unwrap();
AutoVacuum::set(AutoVacuumMode::Incremental, None, conn)?;
// Release at most 8 pages, then whatever is left.
IncrementalVacuum::set(NonZeroU32::new(8), None, conn)?;
IncrementalVacuum::set(None, None, conn)?;

Trait Implementations

impl Clone for IncrementalVacuum

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for IncrementalVacuum

impl Debug for IncrementalVacuum

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Pragma for IncrementalVacuum

const NAME: &'static str = "incremental_vacuum"

The pragma name, written into the SQL unquoted.

type Scope = PerSchema

PerSchema or PerConnection.

impl WritePragma for IncrementalVacuum

type Argument<'a> = Option<NonZero<u32>>

The argument assigned to the pragma, accepted as any type converting into it.