pub struct WalSalt {
pub salt1: u32,
pub salt2: u32,
}Expand description
R858-B19 — the WAL header’s (salt1, salt2), the two 32-bit values SQLite
re-rolls on every WAL reset. Stored big-endian at bytes 16..24 of the
32-byte WAL header, and copied verbatim into bytes 8..16 of every frame
header written under that header — which is where this crate reads it
from, since turso_core::WalState exposes only checkpoint_seq_no and
max_frame.
Why the salt and not the sequence: the salt moves in both fold regimes, and the sequence moves in only one.
- WAL recreated by a writer restart: fresh randomness (measured
b83c03f5 -> 9ca89e39, unrelated), whilecheckpoint_seqresets0 -> 0. - In-process autocheckpoint:
salt1increments in lockstep with the sequence (measuredd492ea8a -> ... -> d492ea92alongside seq0 -> 8).
Fields§
§salt1: u32§salt2: u32Trait Implementations§
impl Copy for WalSalt
impl Eq for WalSalt
impl StructuralPartialEq for WalSalt
Auto Trait Implementations§
impl Freeze for WalSalt
impl RefUnwindSafe for WalSalt
impl Send for WalSalt
impl Sync for WalSalt
impl Unpin for WalSalt
impl UnsafeUnpin for WalSalt
impl UnwindSafe for WalSalt
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