82 lines
2.4 KiB
SQL
82 lines
2.4 KiB
SQL
刷新配置
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build_mode 刷新时机
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物化视图创建完成是否立即刷新。
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IMMEDIATE：立即刷新，默认方式。
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DEFERRED：延迟刷新。
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refresh_method 刷新方式
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COMPLETE：刷新所有分区。
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AUTO：尽量增量刷新，只刷新自上次物化刷新后数据变化的分区，如果不能感知数据变化的分区，只能退化成全量刷新，刷新所有分区。
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refresh_trigger 触发方式
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ON MANUAL 手动触发
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用户通过 SQL 语句触发物化视图的刷新，策略如下
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--检测基表的分区数据自上次刷新后是否有变化，刷新数据变化的分区
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REFRESH MATERIALIZED VIEW mvName AUTO;
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--不校验基表的分区数据自上次刷新后是否有变化，直接刷新物化视图的所有分区。
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REFRESH MATERIALIZED VIEW mvName COMPLETE;
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--只刷新指定的分区。
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REFRESH MATERIALIZED VIEW mvName partitions(partitionName1,partitionName2);
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--ON SCHEDULE 定时触发
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-- 定时全量
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CREATE MATERIALIZED VIEW mv_6
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REFRESH COMPLETE ON SCHEDULE EVERY 10 hour
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AS
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SELECT * FROM lineitem;
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-- 定时增量
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CREATE MATERIALIZED VIEW mv_8
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REFRESH AUTO ON COMMIT
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PARTITION by(l_shipdate)
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AS
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SELECT * FROM lineitem;
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--ON COMMIT 自动触发 (Apache Doris 2.1.4 版本起支持此功能)
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CREATE MATERIALIZED VIEW mv_8
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REFRESH AUTO ON COMMIT
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PARTITION by(l_shipdate)
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AS
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SELECT * FROM lineitem;
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-- BUILD IMMEDIATE 创建完立即刷新
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CREATE MATERIALIZED VIEW mv_1_0
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BUILD IMMEDIATE
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REFRESH AUTO
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ON MANUAL
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DISTRIBUTED BY RANDOM BUCKETS 2
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AS
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SELECT
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l_linestatus,
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to_date(o_orderdate) as date_alias,
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o_shippriority
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FROM
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orders
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LEFT JOIN lineitem ON l_orderkey = o_orderkey;
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-- 延迟刷新 BUILD DEFERRED
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CREATE MATERIALIZED VIEW mv_1_1
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BUILD DEFERRED
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REFRESH COMPLETE
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ON SCHEDULE EVERY 1 DAY STARTS '2024-12-01 20:30:00'
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PROPERTIES ('replication_num' = '1')
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AS
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SELECT
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l_linestatus,
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to_date(o_orderdate) as date_alias,
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o_shippriority
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FROM
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orders
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LEFT JOIN lineitem ON l_orderkey = o_orderkey;
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-------
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CREATE MATERIALIZED VIEW mv_yinzhou
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BUILD IMMEDIATE -- 创建后立即全量刷新
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REFRESH AUTO -- 优先增量刷新（仅刷新变化分区）
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ON SCHEDULE EVERY 1 DAY -- 每日执行一次
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STARTS '2025-06-27 03:15:00' -- 首次刷新时间（次日凌晨3:15）
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DISTRIBUTED BY HASH(l_linestatus) BUCKETS AUTO -- 自动分桶
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AS
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SELECT
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l_linestatus,
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to_date(o_orderdate) as date_alias,
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o_shippriority
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FROM
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orders
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LEFT JOIN lineitem ON l_orderkey = o_orderkey; |