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      Speed up rotation of binary logs when there are 10,000 logs

      The problem is that find_uniq_filename() for each creating of a new binary log file reads all files from the directory, which can take a long time if there are a lot of binary log files.

      Fix is to cache the last used log name number and reuse that for future calls.

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            • Assignee:
              monty Michael Widenius
              Reporter:
              monty Michael Widenius
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