data node参数MaxNoofConcurrentOperation简析_MySQL
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data node参数MaxNoofConcurrentOperation简析
在初始化数据库之后，我们会向其中的表里面导入数据，通过
# mysql -u mysql -p myro_cluster /gxf/PCB20120705_48.sql时，提示错误信息：
ERROR 1297 （HY000）at line 8：Got temporary err 233 ' out of operation records in transaction coordinator (increase MaxNoofConcurrentOperation)' from NDBCLUSTER。
data node 的参数 MaxNoofConcurrentOperation：范围为：32K～4G，默认值为32K。
原则：根据事务的数目和大小来调整该参数的值。如果执行大的事务并且引入较多的记录时，需要把该值设置的大些。
具体值的设定请参考链接：http://dev.mysql.com/doc/refman/5.5/en/mysql-cluster-ndbd-definition.html#ndbparam-ndbd-maxnoofconcurrentoperations
事务是为保证数据的一致性提出的，主要是针对并发操作，因为并发操作可能引发一定的数据的不一致性。它把数据库从一种一致的状态转换为另一种一致的状态。它要么全做，要么全不做。
通过事务控制语句savepoint可以在事务中创建一个标记点，一个事务允许有多个标记点。
这个参数可以在config.ini事务参数模块中配置。
[NDBD DEFAULT]
# Transaction Parameters #
MaxNoOfConcurrentTransactions: 4096
MaxNoOfConcurrentOperations: 100000
MaxNoOfLocalOperations: 100000
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