Struct PoolSnapshot 

pub struct PoolSnapshot {
    pub read_cache_entries: usize,
    pub read_cache_tombstones: usize,
    pub read_cache_hits: usize,
    pub read_cache_misses: usize,
    pub read_cache_capped: usize,
    pub read_cache_open_fails: usize,
    pub read_cache_max_entries: usize,
    pub ledger_writer_inits: usize,
}

Read-cache + ledger-writer snapshot.

Returned by crate::Engine::pool. All counters are monotonic since process start.

Fields

read_cache_entries: usize

Active read-cache entries (open SQLite connections currently parked).

read_cache_tombstones: usize

Tombstoned entries waiting on in-flight reads to drain.

read_cache_hits: usize

Cache hits since process start.

read_cache_misses: usize

Cache misses since process start.

read_cache_capped: usize

Times a read was admitted with a transient slot (cache was at cap).

read_cache_open_fails: usize

Read-cache slot open failures (SQLite open errors).

read_cache_max_entries: usize

Configured maximum cache entries.

ledger_writer_inits: usize

Ledger writer (re)initializations since process start.