Struct CollectionCost 

pub struct CollectionCost {
    pub total_ms: u64,
    pub sqlite_ms: u64,
    pub wal_file_stat_ms: u64,
    pub wal_pin_census_ms: u64,
    pub wal_pin_sidecar_ms: u64,
    pub wal_pin_census_budget_ms: Option<u64>,
    pub wal_pin_census_budget_exhausted: bool,
}

What this report cost to assemble, per section, in milliseconds.

db_diagnostics is the verb an operator reaches for when the system feels slow, and its own cost was measured varying more than five-fold between consecutive calls against one unchanged store on one box. A surface that varies that much has to say which part varied; otherwise the reader is left to guess, and the cheapest guess is “the store is stalled”, which is the conclusion this verb exists to test rather than to suggest.

Every field is wall-clock and measured in this process, so it includes time spent waiting on a contended machine. That is deliberate: the contention is the thing being reported.

Fields

total_ms: u64

Whole-report assembly, from the first section to the last.

sqlite_ms: u64

SQLite-side inspection: the PASSIVE checkpoint probe, page composition, the graph-edge ledger counts and the FTS5 segment records.

wal_file_stat_ms: u64

stat of the WAL file. The cheap sibling of the census; reported so the comparison beside it is legible rather than asserted.

wal_pin_census_ms: u64

The OS holder census: a walk of every process on the host.

wal_pin_sidecar_ms: u64

The sidecar directory enumeration the census is reconciled against.

wal_pin_census_budget_ms: Option<u64>

The wall-clock budget the census was given, or None when it ran unbounded. An Option rather than a sentinel 0 because a producer that failed to record a budget would write 0, which is exactly the value “unbounded” would have claimed.

wal_pin_census_budget_exhausted: bool

Whether the census stopped because that budget was spent. When true the holder list is partial by design and wal_pin.census.status is incomplete for that reason and no other.

Trait Implementations

impl Clone for CollectionCost

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 CollectionCost

impl Debug for CollectionCost

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

Formats the value using the given formatter.

impl Eq for CollectionCost

impl PartialEq for CollectionCost

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for CollectionCost

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for CollectionCost