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  1. MariaDB Server
  2. MDEV-15090

Reduce the overhead of writing undo log records

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      oltp_update_index.lua benchmark commits mini transaction 5 times. This causes log_sys->mutex contention.

      First two mini transactions (write of the first undo log record and the creation of the undo log header) can be combined.

      This change was verified to give ~10% better throughput.

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              Assignee:
              marko Marko Mäkelä
              Reporter:
              svoj Sergey Vojtovich
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