即时更新 (Immediate Update):一旦资料项目在快取中被更新,就立刻更新磁碟中的副本 延迟更新 (Deferred Update):在快取中被更新过的所有资料项目,必须等到交易执行结束或固定个数的交易执行结束才能写入磁碟 投影更新 (Shadow update):更新...
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deferred d update 推迟更新
Note: This is very similar to the update of DB2 configuration parameters, where changes in some parameters take effect immediately, and some are deferred to the instance or database restart.
注意:这非常类似于DB2配置参数的更改,其中对某些参数的更改可以立即生效,有些则会等到实例或数据库重新启动之后才生效。
Neither REFRESH DEFERRED nor REFRESH IMMEDIATE system-maintained MQTs allow insert, update, or delete operations to be executed against them.
不管是REFRESH DEFERRED还是REFRESH immediate类型的系统维护的MQT,对它们的insert、update或delete操作都是不允许的。
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