A COMMIT command in Structured Query Language(SQL) is a transaction command that is used to save all changes made by a particular transaction in a relational database management system since the last COMMIT or ROLLBACK command. It signifies the end of a successful transaction. All the data or...
WORK 为了SQL 标准兼容性而提供的参数,为可选项。语句 COMMIT; 和COMMIT WORK; 是等价的。 COMMENT 提交当前事务并为其关联注释。 此注释可以帮助您诊断分布式事务的故障。 说明 如果网络或机器故障阻止此分布式事务正确提交,则 OceanBase 数据库会将注释与事务 ID 一起存储在数据字典中。 注释指示发生故障的应用程序...
PROCESSLISTshows some connections hanging in query_end state for several seconds INNODB STATUSshows some transactions are commiting data OS monitoring tools show high average time for processing disk request operations for disk partition where InnoDB logs or binary logs are located. (E.g. "await" co...
query — they cannot start or commit that transaction, since there would be no context for them to execute in. However, a block containing an EXCEPTION clause effectively forms a subtransaction that can be rolled back without affecting the outer transaction. 其意义是PostgreSQL的函数总是默认为一个...
5 rows in set (0.02 sec) 通过插入数据(insert into)来查看begin和rollback的用法: mysql> begin -> ; Query OK, 0 rows affected (0.00 sec) mysql> insert into star (name,time,scores,country) values ("LG",now(),78,"中国"); Query OK, 1 row affected, 1 warning (0.02 sec) ...
execute(query) for row in cursor: print(row) db.close() Python Copy上面的代码更新了 Kriti 的城市名称,并将此更改提交到数据库。输出(‘Karan’, 4 ,’Amritsar’ , 95) (‘Sahil’ , 6 , ‘Amritsar’ ,93) (‘Kriti’ , 3 , ‘Kolkata’ ,88) (‘Amit’ , 9 , ‘Delhi’ , 90) (...
mysql>INSERTINTOdt(id, name)VALUES(3,'John'); Query OK,1rowaffected (0.01sec) {'label':'group_commit_a145ce07f1c972fc-bd2c54597052a9ad','status':'PREPARE','txnId':'181508'}-- 不可以立刻查询到导入结果。mysql>SELECT*FROMdt;EmptySET(0.01sec)-- 过10 秒后执行查询,可以查询到,可以...
在AM层,调用xlog相关接口将WAL条目写入WAL文件,PortalDrop清理执行完成后,主入口exec_simple_query()->finish_xact_command()会依次调用CommitTransactionCommand()->CommitTransaction()->RecordTransactionCommit()->XactLogCommitRecord()调用XLogInsert()将commit wal条目写入WAL文件,然后RecordTransactionCommit()调用XLog...
MysqlIO.sqlQueryDirect(MysqlIO.java:2736) at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2486) - locked <0x00000006c7294d98> (a com.mysql.jdbc.JDBC4Connection) at com.mysql.jdbc.ConnectionImpl.commit(ConnectionImpl.java:1555) - locked <0x00000006c7294d98> (a com.mysql.jdbc....
large_query_threshold large_query_worker_percentage leak_mod_to_check lease_time location_cache_priority location_cache_cpu_quota location_cache_expire_time location_cache_refresh_min_interval location_cache_refresh_rpc_timeout location_cache_refresh_sql_timeout location_fetch_concurrency location_refresh...