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SKILL.md
npx skills add tursodatabase/turso --skill storage-format
SQLite file format, B-trees, pages, cells, overflow, freelist that is used in tursodb
npx skills add tursodatabase/turso --skill storage-format
Page size: power of 2, 512-65536 bytes. Default 4096.
| Offset | Size | Field |
|---|---|---|
| 0 | 16 | Magic: "SQLite format 3\0" |
| 16 | 2 | Page size (big-endian) |
| 18 | 1 | Write format version (1=rollback, 2=WAL) |
| 19 | 1 | Read format version |
| 24 | 4 | Change counter |
| 28 | 4 | Database size in pages |
| 32 | 4 | First freelist trunk page |
| 36 | 4 | Total freelist pages |
| 40 | 4 | Schema cookie |
| 56 | 4 | Text encoding (1=UTF8, 2=UTF16LE, 3=UTF16BE) |
All multi-byte integers: big-endian.
| Flag | Type | Purpose |
|---|---|---|
| 0x02 | Interior index | Index B-tree internal node |
| 0x05 | Interior table | Table B-tree internal node |
| 0x0a | Leaf index | Index B-tree leaf |
| 0x0d | Leaf table | Table B-tree leaf |
| - | Overflow | Payload exceeding cell capacity |
| - | Freelist | Unused pages (trunk or leaf) |
Two B-tree types:
Page 1 always root of sqlite_schema table.
Similar but key is arbitrary (columns + rowid), not just rowid.
Serial types:
| Type | Meaning |
|---|---|
| 0 | NULL |
| 1-4 | 1/2/3/4 byte signed int |
| 5 | 6 byte signed int |
| 6 | 8 byte signed int |
| 7 | IEEE 754 float |
| 8 | Integer 0 |
| 9 | Integer 1 |
| ≥12 even | BLOB, length=(N-12)/2 |
| ≥13 odd | Text, length=(N-13)/2 |
When payload exceeds threshold, excess stored in overflow chain:
Last page has next_page=0.
Linked list of trunk pages, each containing leaf page numbers:
Key files:
core/storage/sqlite3_ondisk.rs - On-disk format, PageType enumcore/storage/btree.rs - B-tree operations (large file)core/storage/pager.rs - Page managementcore/storage/buffer_pool.rs - Page caching[payload_size: varint] [rowid: varint] [payload] [overflow_ptr: u32?][left_child_page: u32] [rowid: varint][header_size: varint] [type1: varint] [type2: varint] ... [data1] [data2] ...[next_page: u32] [data...]Trunk: [next_trunk: u32] [leaf_count: u32] [leaf_pages: u32...]# Integrity check
cargo run --bin tursodb test.db "PRAGMA integrity_check;"
# Page count
cargo run --bin tursodb test.db "PRAGMA page_count;"
# Freelist info
cargo run --bin tursodb test.db "PRAGMA freelist_count;"