cirry
2f9c8bee2b
- adj_factor 覆盖索引 (ts_code,trade_date) INCLUDE (adj_factor)：根治堆碎片化 （单股 6516 行散 6516 块，满载时位图堆扫 1.5s+），Index Only Scan ~2ms； 因子查询全部改 2 列投影，lag() 窗口只取变点（6516→32 行） - preview 冷路径 2 会话 2 波并发，信息卡合并为 LEFT JOIN LATERAL 一条 - 鉴权会话 60s 进程内缓存（登出/全端登出即时失效），全站请求省 ~80ms - pvj/chipsj/stocksj/facetsj 存 model_dump_json 原串直返（与 response_model 字节一致），热路径 230-2190ms → 1-2ms；get_version 本地缓存+bump 即时可见 - 连接池 10+20；smoke_test 适配鉴权缓存
50 lines
1.6 KiB
Python
50 lines
1.6 KiB
Python
"""adj_factor 覆盖索引：因子查询免堆访问（碎片免疫）
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Revision ID: 20260902_01
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Revises: 20260815_04
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Create Date: 2026-09-02
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"""
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from typing import Sequence, Union
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from alembic import op
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revision: str = "20260902_01"
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down_revision: Union[str, Sequence[str], None] = "20260815_04"
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branch_labels: Union[str, Sequence[str], None] = None
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depends_on: Union[str, Sequence[str], None] = None
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def upgrade() -> None:
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# CONCURRENTLY / VACUUM 不能在事务内执行；autocommit_block 内每条语句独立提交
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with op.get_context().autocommit_block():
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op.create_index(
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"ix_adj_code_date_cover",
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"adj_factor",
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["ts_code", "trade_date"],
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postgresql_concurrently=True,
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postgresql_include=["adj_factor"],
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)
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# ts_code 单列索引被覆盖索引取代（同前缀），删掉省写放大
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op.drop_index(
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"ix_adj_factor_ts_code",
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table_name="adj_factor",
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postgresql_concurrently=True,
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)
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# 刷可见性映射（Index Only Scan 的前提）+ 更新统计信息；低峰执行（3.2GB 表数十秒）
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op.execute("VACUUM (ANALYZE) adj_factor")
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def downgrade() -> None:
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with op.get_context().autocommit_block():
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op.create_index(
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"ix_adj_factor_ts_code",
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"adj_factor",
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["ts_code"],
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postgresql_concurrently=True,
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)
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op.drop_index(
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"ix_adj_code_date_cover",
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table_name="adj_factor",
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postgresql_concurrently=True,
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)
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