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更新时间：2022-12-14 GMT+08:00
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操作并发

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

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-

-

-

-

-

-

-

-

-

DROP TABLE

√

-

√

-

-

-

-

√

-

-

ALTER TABLE COMPACTION

-

√

-

-

-

-

√

-

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-

TABLE RENAME

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-

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-

ADD COLUMNS

√

√

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-

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DROP COLUMNS

√

√

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-

-

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-

CHANGE DATA TYPE

√

√

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-

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-

-

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REFRESH TABLE

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-

REGISTER INDEX TABLE

√

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-

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-

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REFRESH INDEX

-

√

-

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-

-

-

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-

-

LOAD DATA/INSERT INTO

-

-

-

-

-

-

-

-

√

√

UPDATE CARBON TABLE

√

√

-

-

-

-

√

-

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-

DELETE RECORDS from CARBON TABLE

√

√

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-

√

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-

DELETE SEGMENT by ID

-

-

-

√

√

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DELETE SEGMENT by DATE

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-

√

√

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SHOW SEGMENTS

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-

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-

CREATE SECONDARY INDEX

√

√

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√

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SHOW SECONDARY INDEXES

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-

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DROP SECONDARY INDEX

√

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√

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CLEAN FILES

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-

-

-

-

-

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SET/RESET

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Add Hive Partition

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Drop Hive Partition

√

√

√

√

√

√

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-

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Drop Partition

√

√

√

√

√

√

-

-

-

-

Alter table set

√

√

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-

-

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父主题： CarbonData语法参考