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39a75147d4
Since page cache is now shared by default, we need to cache pages by page number and something else. I chose to go with max_frame of connection, because this connection will have a max_frame set until from the start of a transaction until the end of it. With key pairs of (pgno, max_frame) we make sure each connection is caching based on the snapshot it is at as two different connections might have the same pageno being using but a different frame. If both have same max_frame then they will share same page.
21 lines
853 B
Rust
21 lines
853 B
Rust
//! The storage layer.
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//!
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//! This module contains the storage layer for Limbo. The storage layer is
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//! responsible for managing access to the database and its pages. The main
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//! interface to the storage layer is the `Pager` struct, which is
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//! responsible for managing the database file and the pages it contains.
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//!
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//! Pages in a database are stored in one of the following to data structures:
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//! `DatabaseStorage` or `Wal`. The `DatabaseStorage` trait is responsible
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//! for reading and writing pages to the database file, either local or
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//! remote. The `Wal` struct is responsible for managing the write-ahead log
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//! for the database, also either local or remote.
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pub(crate) mod btree;
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pub(crate) mod buffer_pool;
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pub(crate) mod database;
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pub(crate) mod page_cache;
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pub(crate) mod pager;
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pub(crate) mod sqlite3_ondisk;
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pub(crate) mod wal;
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