云服务器内容精选

华为云首页用户手册

CarbonData语法参考

MapReduce服务 MRS-CarbonData表操作并发语法说明

CarbonData表操作并发语法说明 DDL和DML中的操作，执行前，需要获取对应的锁，各操作需要获取锁的情况见表1 操作获取锁一览表，√表示需要获取该锁，一个操作仅在获取到所有需要获取的锁后，才能继续执行。任意两个操作是否可以并发执行，可以通过如下方法确定：表1两行代表两个操作，这两行没有任意一列都标记√，即不存在某一列两行全为√。表1 操作获取锁一览表操作 METADATA_LOCK COMPACTION_LOCK DROP_TABLE_LOCK DELETE_SEGMENT_LOCK CLEAN_FILES_LOCK ALTER_PARTITION_LOCK UPDATE_LOCK STREAMING_LOCK CONCURRENT_LOAD_LOCK SEGMENT_LOCK CREATE TABLE - - - - - - - - - - CREATE TABLE As SELECT - - - - - - - - - - DROP TABLE √ - √ - - - - √ - - ALTER TABLE COMPACTION - √ - - - - √ - - - TABLE RENAME - - - - - - - - - - ADD COLUMNS √ √ - - - - - - - - DROP COLUMNS √ √ - - - - - - - - CHANGE DATA TYPE √ √ - - - - - - - - REFRESH TABLE - - - - - - - - - - REGISTER INDEX TABLE √ - - - - - - - - - REFRESH INDEX - √ - - - - - - - - LOAD DATA/INSERT INTO - - - - - - - - √ √ UPDATE CARBON TABLE √ √ - - - - √ - - - DELETE RECORDS from CARBON TABLE √ √ - - - - √ - - - DELETE SEGMENT by ID - - - √ √ - - - - - DELETE SEGMENT by DATE - - - √ √ - - - - - SHOW SEGMENTS - - - - - - - - - - CREATE SECONDARY INDEX √ √ - √ - - - - - - SHOW SECONDARY INDEXES - - - - - - - - - - DROP SECONDARY INDEX √ - √ - - - - - - - CLEAN FILES - - - - - - - - - - SET/RESET - - - - - - - - - - Add Hive Partition - - - - - - - - - - Drop Hive Partition √ √ √ √ √ √ - - - - Drop Partition √ √ √ √ √ √ - - - - Alter table set √ √ - - - - - - - - 父主题： CarbonData语法参考

MapReduce服务 MRS CarbonData语法参考