v22.4 开始在单机 MergeTree 上支持事务,需要 "Begin Transaction" 和 "Commit/Rollback"。只支持 insert, update, delete 语句。 v22.7 增加参数implicit transaction,设为 true 时,事务无需 "Begin", "Commit/Rollback" 包裹,单条语句自动在事务中执行。 最新的 lts 版本 v22.8 已包含以上两个功能。 目前仍...
通过执行语句set implicit_transaction='true';,可以使用会话级别的隐式事务。ClickHouse目前没有alter queries中断机制,所以alter queries(如:lightweight delete)执行过程中被中断之后,即便开启隐式事务能力,也无法回滚,与开源保持一致。 分布式表事务性插入使用方法: ...
自从2016年6月15日开源后,从 ClickHouse 1.1.54245(2017-07-04)发布支持分布式DDL、复制查询、字典引擎等功能,到2018年期间支持 MySQL引擎、支持 HDFS引擎、支持JDBC引擎、支持Kafka引擎使用多个消费者、支持JOIN ON 语法、支持表中存储多维数组和元组、支持format格式化查询、支持clickhouse-copier(测试版)及系统库下各...
Adds new setting implicit_transaction to run standalone queries inside a transaction. It handles both creation and closing (via COMMIT if the query succeeded or ROLLBACK if it didn't) of the transaction automatically. #38344 (Raúl Marín). ...
clickhouse-local uses implicit SELECT by default, which allows to use it as a calculator. Improve the syntax highlighting for the implicit SELECT mode. #71620 (Alexey Milovidov). The command line applications will highlight syntax even for multi-statements. #71622 (Alexey Milovidov). Command...
transactions 01173_transaction_control_queries 02345_implicit_transaction @kitaisreal optimize_using_constraints 01624_soft_constraints Hypothesis index in new analyzer #48381 read_in_order 00940_order_by_read_in_order_query_plan Analyzer ORDER BY read in order query plan add test #56532 @kitaisreal...
[86fe010]: improve implicit transaction support and error handling (Zhichun Wu)#1008 [9633bf8]: Improve error message as suggested in#1010(Zhichun Wu)#1008 [d7a6f77]: Roll back unnecessary changes (Zhichun Wu)#1008 [33cf266]: Enable repeat_on_session_lock to test CI (Zhichun Wu)#1008...
2023.08.31 23:30:25.631721 [ 275 ] {} <Trace> ContextAccess (default): List of all grants including implicit: GRANT SHOW, SELECT, INSERT, ALTER, CREATE, DROP, TRUNCATE, OPTIMIZE, BACKUP, KILL QUERY, KILL TRANSACTION, MOVE PARTITION BETWEEN SHARDS, SYSTEM, dictGet, INTROSPECTION, SOURCES, ...
Note that for CPU efficiency, the query language must be declarative (SQL or MDX), or at least a vector (J, K). The query should only contain implicit loops, allowing for optimization. 典型问题场景 使用原生的 ClickHouse,在大数据量的时候会发生很多问题: ...
Note that for CPU efficiency, the query language must be declarative (SQL or MDX), or at least a vector (J, K). The query should only contain implicit loops, allowing for optimization. 典型问题场景 使用原生的 ClickHouse,在大数据量的时候会发生很多问题: ...