Hive 索引

目的：優化查詢以及檢索性能
創建索引：
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create index t1_index on table person0(name) as 'org.apache.hadoop.hive.ql.index.compact.CompactIndexHandler' with deferred rebuild in table t1_index_table;

as：指定索引器；
in table：指定索引表，若不指定默認生成在 default_person0_t1_index_表中

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create index t1_index on table person0(name) as 'org.apache.hadoop.hive.ql.index.compact.CompactIndexHandler' with deferred rebuild;

查詢索引
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show index on person0;

重建索引（建立索引之后必須重建索引才能生效）

ALTER INDEX t1_index ON person0 REBUILD;

刪除索引

DROP INDEX IF EXISTS t1_index ON person0;

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Hive> create index t1_index on table person0(name) as 'org.apache.hadoop.hive.ql.index.compact.CompactIndexHandler' with deferred rebuild in table t1_index_table; hive> show tables; person0 t1_index_table hive> show index on person0; t1_index person0 name t1_index_table compact hive> ALTER INDEX t1_index ON person0 REBUILD; hive> select * from t1_index_table; Cat hdfs://mycluster/user/hive/warehouse/person0/person0_data [87] Jed hdfs://mycluster/user/hive/warehouse/person0/person0_data [0] Tom hdfs://mycluster/user/hive/warehouse/person0/person0_data [32]

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總結

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