Enum EnvironmentKind

pub enum EnvironmentKind {
    Default,
    WriteMap,
}

Determines how data is mapped into memory

It only takes affect when the environment is opened.

Variants

Default

Open the environment in default mode, without WRITEMAP.

WriteMap

Open the environment as mdbx-WRITEMAP. Use a writeable memory map unless the environment is opened as MDBX_RDONLY (crate::Mode::ReadOnly).

All data will be mapped into memory in the read-write mode crate::Mode::ReadWrite. This offers a significant performance benefit, since the data will be modified directly in mapped memory and then flushed to disk by single system call, without any memory management nor copying.

This mode is incompatible with nested transactions.

Implementations

impl EnvironmentKind

pub const fn is_write_map(&self) -> bool

Returns true if the environment was opened as WRITEMAP.

Trait Implementations

impl Clone for EnvironmentKind

fn clone(&self) -> EnvironmentKind

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for EnvironmentKind

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

Formats the value using the given formatter.

impl Default for EnvironmentKind

fn default() -> EnvironmentKind

Returns the “default value” for a type.

impl PartialEq for EnvironmentKind

fn eq(&self, other: &EnvironmentKind) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for EnvironmentKind

impl Eq for EnvironmentKind

impl StructuralPartialEq for EnvironmentKind

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 1 byte

Size for each variant:

• Default: 0 bytes
• WriteMap: 0 bytes