reth_db::mdbx

Enum EnvironmentKind

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pub enum EnvironmentKind {
    Default,
    WriteMap,
}
Available on crate feature mdbx only.
Expand description

Determines how data is mapped into memory

It only takes affect when the environment is opened.

Variants§

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Default

Open the environment in default mode, without WRITEMAP.

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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§

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impl EnvironmentKind

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pub const fn is_write_map(&self) -> bool

Returns true if the environment was opened as WRITEMAP.

Trait Implementations§

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impl Clone for EnvironmentKind

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fn clone(&self) -> EnvironmentKind

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for EnvironmentKind

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

Formats the value using the given formatter. Read more
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impl Default for EnvironmentKind

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fn default() -> EnvironmentKind

Returns the “default value” for a type. Read more
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impl PartialEq for EnvironmentKind

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

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

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

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impl Eq for EnvironmentKind

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impl StructuralPartialEq for EnvironmentKind

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impl<T> Any for T
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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit #126799)
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Causes self to use its LowerExp implementation when Debug-formatted.
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const ALIGN: usize = _

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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