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If this happens, the UPDATE will terminate with an error ("subquery may return only one row").
This method also has some advantages when you have pending write requests, as we will see in the next section.
For example, you can set a rule to record the deleted rows before you start the data migration: Once you reach a certain size, operations that were once instantaneous can take several hours to prepare and execute.
At Codacy we receive thousands of write requests every minute and we manage hundreds of gigabytes of data.
the optimizer will use the stale statistics, but run the statistics update in the background, so that the next query had take advantage of the new stats.
works fine when I try to update all the records in tbl A, however, in this case I only have missing data which I have identified and populated in tbl B.