Enum CheckpointPolicy 

pub enum CheckpointPolicy {
    Manual,
    SizeRatio {
        factor: u32,
    },
}

Auto-checkpoint policy: decides when a dirty commit should fold the delta-log into a fresh base generation, bounding the log tail that recovery must replay.

The default is size-ratio: trigger when the delta-log grows past factor times the live base size (factor configurable). CheckpointPolicy::Manual disables auto-triggering entirely (checkpoint only via Database::checkpoint/Database::compact).

Performance

Copying this value is O(1).

Variants

Manual

Never auto-checkpoint; the caller drives Database::checkpoint.

SizeRatio

Auto-checkpoint after a dirty commit once the delta-log exceeds factor times the live base size (a small floor guards a tiny/empty base so the gen-0 store does not checkpoint on its first commit).

Fields

factor: u32

Log-to-base size factor K; the log may grow to K × base bytes before the next dirty commit folds it.

Implementations

impl CheckpointPolicy

pub const DEFAULT_FACTOR: u32 = 4

The default auto-checkpoint factor K: fold when the delta-log exceeds four times the live base size.

Trait Implementations

impl Clone for CheckpointPolicy

fn clone(&self) -> CheckpointPolicy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for CheckpointPolicy

impl Debug for CheckpointPolicy

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

Formats the value using the given formatter.

impl Default for CheckpointPolicy

fn default() -> Self

The default policy: size-ratio with CheckpointPolicy::DEFAULT_FACTOR.

Performance

This function is O(1).

impl Eq for CheckpointPolicy

impl PartialEq for CheckpointPolicy

fn eq(&self, other: &CheckpointPolicy) -> 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 StructuralPartialEq for CheckpointPolicy