`visit_users`BITMAP BITMAP_UNION NOTNULLCOMMENT'访问用户id') ENGINE=OLAPAGGREGATEKEY(`page_id`, `visit_date`)DISTRIBUTEDBYHASH(`page_id`)PROPERTIES ("replication_num" = "3","storage_format" = "DEFAULT");向表中导入数据。
ReturnInvalid Return Date Find Flights Flight Status Just select the Star Alliance member airline and enter the flight number to retrieve the status of any flight in the Star Alliance network. Airline *Select AirlineAegean AirlinesAir CanadaAir ChinaAir IndiaAir New ZealandANAAsiana AirlinesAustrian ...
ReturnInvalid Return Date Find Flights Flight Status Just select the Star Alliance member airline and enter the flight number to retrieve the status of any flight in the Star Alliance network. Airline *Select AirlineAegean AirlinesAir CanadaAir ChinaAir IndiaAir New ZealandANAAsiana AirlinesAustrian ...
明细模型并不会对数据做任何处理,DUPLICATE KEY 只用于定义排序键,相同 DUPLICATE KEY 的记录会同时存在。 所以推荐用来存储原始的日志明细数据。
CTAS可以实现单表的结构和数据同步,CDAS可以实现整库同步或者同一库中的多表结构和数据同步。本文为您介绍如何使用实时计算Flink平台和E-MapReduce StarRocks通过CTAS&CDAS功能实现实时数仓中TP(Transaction Processing)和AP(Analytical Processing)数据同步的场景
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当需要对表数据进行非前置列(排序键)进行过滤时,可以创建bitmap索引加速效率。 对表数据进行多列过滤,也可以考虑对多列分别创建bitmap索引加速效率 使用: 创建测试表 CREATE TABLE IF NOT EXISTS user_dup ( user_id INT, sex INT , age INT )DUPLICATE KEY(user_id)DISTRIBUTED BY HASH(user_id) BUCKETS 8...
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查询是否命中了Bitmap filter索引,可查看该查询的Profile中的BitmapIndexFilterRows字段。 创建索引 建表时创建Bitmap索引 CREATE TABLE `student_info` ( `s_stukey` bigint(20) NULL COMMENT "", `s_name` varchar(65533) NULL COMMENT "", `s_gender` varchar(65533) NULL COMMENT...
(4)列级别的索引技术: Bloomfilter可快速判断数据块中不含所查找值, ZoneMap通过数据范围快速过滤待查找值, Bitmap索引可快速计算出枚举类型的列满足一定条件的行. 2.4、数据模型 目前StarRocks根据摄入数据和实际存储数据之间的映射关系,分为明细模型(Duplicate key)、聚合模型(Aggregate key)、更新模型(Unique key)...