mirror of
https://github.com/tiennm99/thptqg.git
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tiennm99
dbf13d0094
The browser fetches this file one page per HTTP request, so the page size is the granularity of every read. At SQLite's 4 KiB default a row reached by an index seek dragged 4 KB across the network; at 1 KiB it drags 1 KB. A name search returns up to 100 scattered rows, so its row fetches fall from about 400 KB to about 100 KB. Measured on the rebuilt 2016 file: 6.3 rows share a page where 27 did. The index walks are sequential and unaffected in bytes — the library's read-ahead already collapses those into few requests. Cost is 4% file size: 2016 288.6 -> 302.4 MB, 2017 237.7 -> 247.3 MB, the site 528 -> 552 MB against the 1 GB GitHub Pages limit. Both sql.js-httpvfs and sqlite-wasm-http recommend this page size. The PRAGMA has to run before the DDL, since a page size is fixed once a table exists, and requestChunkSize on the client has to match or every page read spans two requests. Row counts unchanged and through the assembler guards; query plans re-checked and still index-driven on the rebuilt files.
32 lines
1.2 KiB
JSON
32 lines
1.2 KiB
JSON
{
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"_comment": [
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"The dataset registry: the one place every pipeline stage agrees on what",
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"exists. JSON because the Go stages and the Vite app both read it.",
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"",
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" id the identifier used end to end, from data/<id>/ to /thptqg/<id>/",
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" expectedRows exact row count of the built database, not an estimate. The",
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" inputs are frozen exam results, so a deviation of even one row",
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" means something changed unintentionally and the assembler",
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" refuses to publish.",
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" dbSizeMb usual size of the published database. Required and non-zero:",
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" the assembler rejects a build that comes out far smaller. The",
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" file is served uncompressed and read a page at a time over",
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" HTTP range requests, so nothing downloads it whole.",
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"",
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"Presentation (titles, labels, SQL presets) lives in web/src/datasets.js keyed",
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"by id; that file throws at load if the two lists disagree."
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],
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"datasets": [
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{
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"id": "2016",
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"expectedRows": 877460,
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"dbSizeMb": 302
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},
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{
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"id": "2017",
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"expectedRows": 861068,
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"dbSizeMb": 247
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}
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]
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}
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