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大分区表全量 ORDER BY Id 会打满 MySQL sort_buffer；组包仍在内存排序，并补充 (AreaId, Id) 索引脚本。 Co-authored-by: Cursor <cursoragent@cursor.com>
19 lines
555 B
SQL
19 lines
555 B
SQL
-- 分区明细按 AreaId 全量/分页查询时避免 filesort 打满 sort_buffer（查价 LIVE 路径易踩）
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SET @db := DATABASE();
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SET @idx := (
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SELECT COUNT(1)
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FROM information_schema.STATISTICS
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WHERE TABLE_SCHEMA = @db
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AND TABLE_NAME = 't_kpi_area_info'
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AND INDEX_NAME = 'idx_kpi_info_area_id'
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);
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SET @sql := IF(
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@idx = 0,
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'ALTER TABLE `t_kpi_area_info` ADD KEY `idx_kpi_info_area_id` (`AreaId`, `Id`)',
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'SELECT ''idx_kpi_info_area_id already exists'' AS info'
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);
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PREPARE stmt FROM @sql;
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EXECUTE stmt;
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DEALLOCATE PREPARE stmt;
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