storage-format
261
总安装量
261
周安装量
#1026
全站排名
安装命令
npx skills add https://github.com/tursodatabase/turso --skill storage-format
Agent 安装分布
claude-code
190
github-copilot
79
codex
15
opencode
15
gemini-cli
14
replit
11
Skill 文档
Storage Format Guide
Database File Structure
âââââââââââââââââââââââââââââââ
â Page 1: Header + Schema â â First 100 bytes = DB header
âââââââââââââââââââââââââââââââ¤
â Page 2..N: B-tree pages â â Tables and indexes
â Overflow pages â
â Freelist pages â
âââââââââââââââââââââââââââââââ
Page size: power of 2, 512-65536 bytes. Default 4096.
Database Header (First 100 Bytes)
| 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.
Page Types
| 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) |
B-tree Structure
Two B-tree types:
- Table B-tree: 64-bit rowid keys, stores row data
- Index B-tree: Arbitrary keys (index columns + rowid)
Interior page: [ptr0] key1 [ptr1] key2 [ptr2] ...
â â â
â¼ â¼ â¼
child child child
pages pages pages
Leaf page: key1:data key2:data key3:data ...
Page 1 always root of sqlite_schema table.
Cell Format
Table Leaf Cell
[payload_size: varint] [rowid: varint] [payload] [overflow_ptr: u32?]
Table Interior Cell
[left_child_page: u32] [rowid: varint]
Index Cells
Similar but key is arbitrary (columns + rowid), not just rowid.
Record Format (Payload)
[header_size: varint] [type1: varint] [type2: varint] ... [data1] [data2] ...
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 |
| â¥12 even | BLOB, length=(N-12)/2 |
| â¥13 odd | Text, length=(N-13)/2 |
Overflow Pages
When payload exceeds threshold, excess stored in overflow chain:
[next_page: u32] [data...]
Last page has next_page=0.
Freelist
Linked list of trunk pages, each containing leaf page numbers:
Trunk: [next_trunk: u32] [leaf_count: u32] [leaf_pages: u32...]
Turso Implementation
Key files:
core/storage/sqlite3_ondisk.rs– On-disk format,PageTypeenumcore/storage/btree.rs– B-tree operations (large file)core/storage/pager.rs– Page managementcore/storage/buffer_pool.rs– Page caching
Debugging Storage
# 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;"