Enum PinSource 

pub enum PinSource {
    TransactionSnapshot,
    HistoryRetention,
    BackupPitr,
    Replication,
    ReadGeneration,
    OnlineIndexBuild,
}

The version-retention pin sources of spec §10.3 (S1C-004). A version may be reclaimed only when it is older than the oldest pin of every source.

Variants

TransactionSnapshot

Oldest active transaction/read snapshot (MVCC readers). Projected from SnapshotRegistry and the table-local pin set in diagnostics.

HistoryRetention

Configured rolling history-retention window. Projected from SnapshotRegistry::history_floor in diagnostics.

BackupPitr

Oldest backup / point-in-time-recovery pin.

Replication

Oldest replication-follower requirement.

ReadGeneration

Oldest cursor / immutable read-generation pin.

OnlineIndexBuild

Oldest online index build still reading historical versions.

Implementations

impl PinSource

pub const ALL: [PinSource; 6]

Every source, in stable declaration order (diagnostics iteration).

pub fn label(self) -> &'static str

Stable lowercase label for logs and diagnostics output.

Trait Implementations

impl Clone for PinSource

fn clone(&self) -> PinSource

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for PinSource

impl Debug for PinSource

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

Formats the value using the given formatter.

impl Eq for PinSource

impl Hash for PinSource

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for PinSource

fn cmp(&self, other: &PinSource) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for PinSource

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for PinSource

fn partial_cmp(&self, other: &PinSource) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for PinSource