From 57bc6526294c8d04b6c24f82eefe3c643c704603 Mon Sep 17 00:00:00 2001 From: yuetsh <517252939@qq.com> Date: Mon, 7 Sep 2026 07:42:46 -0600 Subject: [PATCH] =?UTF-8?q?perf(=E6=95=B0=E6=8D=AE=E5=BA=93):=20user=20?= =?UTF-8?q?=E8=A1=A8=E8=A1=A5=E4=B8=A4=E4=B8=AA=E7=B4=A2=E5=BC=95=EF=BC=8C?= =?UTF-8?q?=E7=8F=AD=E7=BA=A7=E8=BF=87=E6=BB=A4=E5=92=8C=E6=B4=BB=E8=B7=83?= =?UTF-8?q?=E4=BA=BA=E6=95=B0=E7=BB=9F=E8=AE=A1=E4=B8=8D=E5=86=8D=E5=85=A8?= =?UTF-8?q?=E8=A1=A8=E6=89=AB?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit `user` 原来只有主键和 username 唯一约束两个索引 —— 它是 drizzle-kit pull 从 Django 建的表拉出来的，Django 那边也没建过别的。于是两条常走的查询都是全表扫： - `problems/:id/beat-count` 里「近两年登录过的活跃人数」按 is_disabled + last_login 过滤，每打开一次题目详情算一遍； - `routes/classroom.ts` 的 loadClassUsers 按 class_name（或年级前缀 like '241%'） 取学生，班级榜、班级对比、AI 学情的排名 scope 都走它。 两千行的表现在扫起来确实不贵，但这是随人数线性涨的那类成本，而且比在应用层加缓存 更根本：不引入陈旧，也不需要考虑失效。 `user_active_idx` 的列序是 (is_disabled, last_login)：等值条件在前、范围条件在后。 迁移只有两条 CREATE INDEX，无附带改动；本机 db:migrate 跑过，两个索引都在。 索引效果没法在本机验 —— dev 库只有 12 条提交、几十个用户，规划器无论如何都走 seq scan，要到生产（12 万提交）才看得出来。 Co-Authored-By: Claude Opus 5 Claude-Session: https://claude.ai/code/session_01XvmqDsZNyUo9P3sFQtoWVB --- apps/api/src/db/0011_user_lookup_indexes.sql | 2 + apps/api/src/db/meta/0011_snapshot.json | 3936 ++++++++++++++++++ apps/api/src/db/meta/_journal.json | 7 + apps/api/src/db/schema.ts | 6 + 4 files changed, 3951 insertions(+) create mode 100644 apps/api/src/db/0011_user_lookup_indexes.sql create mode 100644 apps/api/src/db/meta/0011_snapshot.json diff --git a/apps/api/src/db/0011_user_lookup_indexes.sql b/apps/api/src/db/0011_user_lookup_indexes.sql new file mode 100644 index 0000000..0ca9d95 --- /dev/null +++ b/apps/api/src/db/0011_user_lookup_indexes.sql @@ -0,0 +1,2 @@ +CREATE INDEX "user_active_idx" ON "user" USING btree ("is_disabled","last_login" DESC NULLS FIRST);--> statement-breakpoint +CREATE INDEX "user_class_name_idx" ON "user" USING btree ("class_name"); \ No 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"'{}'::jsonb" + }, + "avatar": { + "name": "avatar", + "type": "text", + "primaryKey": false, + "notNull": true + }, + "mood": { + "name": "mood", + "type": "text", + "primaryKey": false, + "notNull": false + }, + "accepted_number": { + "name": "accepted_number", + "type": "integer", + "primaryKey": false, + "notNull": true, + "default": 0 + }, + "submission_number": { + "name": "submission_number", + "type": "integer", + "primaryKey": false, + "notNull": true, + "default": 0 + }, + "user_id": { + "name": "user_id", + "type": "integer", + "primaryKey": false, + "notNull": true + }, + "real_name": { + "name": "real_name", + "type": "text", + "primaryKey": false, + "notNull": false + } + }, + "indexes": {}, + "foreignKeys": { + "user_profile_user_id_8fdce8e2_fk_user_id": { + "name": "user_profile_user_id_8fdce8e2_fk_user_id", + "tableFrom": "user_profile", + "tableTo": "user", + "columnsFrom": [ + "user_id" + ], + "columnsTo": [ + "id" + ], + "onDelete": "cascade", + "onUpdate": "no action" + } + }, + "compositePrimaryKeys": {}, + "uniqueConstraints": { + "user_profile_user_id_key": { + "name": "user_profile_user_id_key", + "nullsNotDistinct": false, + "columns": [ + "user_id" + ] + } + }, + "policies": {}, + "checkConstraints": {}, + "isRLSEnabled": false + }, + "public.user_stat": { + "name": "user_stat", + "schema": "", + "columns": { + "id": { + "name": "id", + "type": "bigint", + "primaryKey": true, + "notNull": true, + "identity": { + "type": "byDefault", + "name": "user_stat_id_seq", + "schema": "public", + "increment": "1", + "startWith": "1", + "minValue": "1", + "maxValue": "9223372036854775807", + "cache": "1", + "cycle": false + } + }, + "metrics": { + "name": "metrics", + "type": "jsonb", + "primaryKey": false, + "notNull": true, + "default": "'{}'::jsonb" + }, + "update_time": { + "name": "update_time", + "type": "timestamp with time zone", + "primaryKey": false, + "notNull": true + }, + "user_id": { + "name": "user_id", + "type": "integer", + "primaryKey": false, + "notNull": true + } + }, + "indexes": {}, + "foreignKeys": { + "user_stat_user_id_73337fc0_fk_user_id": { + "name": "user_stat_user_id_73337fc0_fk_user_id", + "tableFrom": "user_stat", + "tableTo": "user", + "columnsFrom": [ + "user_id" + ], + "columnsTo": [ + "id" + ], + "onDelete": "cascade", + "onUpdate": "no action" + } + }, + "compositePrimaryKeys": {}, + "uniqueConstraints": { + "user_stat_user_id_key": { + "name": "user_stat_user_id_key", + "nullsNotDistinct": false, + "columns": [ + "user_id" + ] + } + }, + "policies": {}, + "checkConstraints": {}, + "isRLSEnabled": false + } + }, + "enums": {}, + "schemas": {}, + "sequences": {}, + "roles": {}, + "policies": {}, + "views": {}, + "_meta": { + "columns": {}, + "schemas": {}, + "tables": {} + } +} \ No newline at end of file diff --git a/apps/api/src/db/meta/_journal.json b/apps/api/src/db/meta/_journal.json index 3d67f74..6c84c25 100644 --- a/apps/api/src/db/meta/_journal.json +++ b/apps/api/src/db/meta/_journal.json @@ -78,6 +78,13 @@ "when": 1788409961010, "tag": "0010_fk_cascade_on_delete", "breakpoints": true + }, + { + "idx": 11, + "version": "7", + "when": 1788788493497, + "tag": "0011_user_lookup_indexes", + "breakpoints": true } ] } \ No newline at end of file diff --git a/apps/api/src/db/schema.ts b/apps/api/src/db/schema.ts index 964f488..7912c24 100644 --- a/apps/api/src/db/schema.ts +++ b/apps/api/src/db/schema.ts @@ -664,6 +664,12 @@ export const user = pgTable("user", { className: text("class_name"), }, (table) => [ unique("user_username_key").on(table.username), + // 「近两年登录过的活跃人数」—— problems/:id/beat-count 每次打开题目详情都要算一遍， + // 而这张表原来只有主键和 username 两个索引，那句统计是全表扫。 + index("user_active_idx").using("btree", table.isDisabled.asc().nullsLast(), table.lastLogin.desc().nullsFirst()), + // 按班级 / 按年级（class_name like '241%'）取学生：班级榜、班级对比、AI 学情的 + // 排名 scope 都走它，见 routes/classroom.ts 的 loadClassUsers。 + index("user_class_name_idx").using("btree", table.className.asc().nullsLast()), ]); export const problemsetBadge = pgTable("problemset_badge", {