当一个页面被扫描时，它的校验和被计算且与该页面存储在一起。
When a page is scanned, its checksum is calculated and stored with the page.
虽然大小不同于原文件，但是转储每一个文件并计算 MD5 哈希显示了它们的校验和是相同的。
The size of the file is different from the original, but dumping each file and calculating the MD5 hash shows that their checksums are the same.
对付该问题的一个办法就是，计算一个事务日志的校验和，并把它作为commit block过程的一部分写到日志中。
A way to counter the journal corruption is to compute a checksum of the transaction log and write it as part of the commit block process.
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