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Displaying posts with tag: innnodb recovery (reset)

Finally. How to verify if all MySQL records were recovered
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After nearly every recovery case the same question arises: How many MySQL records were recovered and how many were lost.

Until now there was no way to answer the question without manual investigation. As it turned out a small change can make a big difference.

There are two ways to know how many records an InnoDB page stores. The index page has a header PAGE_N_RECS – this is a number of records the page stores. Obviously it doesn’t count any deleted records. The second method to confirm how many records are in the page is to follow records pointers – and count them.

As you might know, records inside an InnoDB page are organized in

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