The instance data block DB1 doesn't exist, Do you want to generate it?
背景数据块DB1不存在，你是否要产生它？
Finally, the string type is a reference type, so every string instance refers to an additional block of memory to hold the actual string data.
最后，字符串类型是引用类型，因此每个字符串实例都引用一个附加的内存块，以存放实际的字符串数据。
When a RAC instance requires a data block that is currently being updated on the local instance.
当某个RAC实例要求一个数据块，这个数据块当前正在被本地实例修改，那么这个需求。
For instance, suppose a block of data has arrived on a network line.
比如，假设一块数据到达了网络设备。
It can avoid reading the same reference instance and records in the same data block repeatedly. Meanwhile it can convert random reading disk into doing by table.
使用该算法避免了对同一引用实例或是位于同一数据块上不同记录的重复读取，并将对磁盘的随机读取方式转变为按列表预取的读取方式。
It can avoid reading the same reference instance and records in the same data block repeatedly. Meanwhile it can convert random reading disk into doing by table.
使用该算法避免了对同一引用实例或是位于同一数据块上不同记录的重复读取，并将对磁盘的随机读取方式转变为按列表预取的读取方式。
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