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  1. MariaDB Server
  2. MDEV-21136

InnoDB's records_in_range estimates can be way off

Details

    Description

      It is expected that the range estimates that InnoDB returns from records_in_range call are not exact. Returning about 2x more or 2x less than actual value is considered to be still ok.

      However, we are observing a 4.8x difference on a fairly large table. Unfortunately, the table is at the customer site and cannot be provided here.

      Attachments

        Issue Links

          causes

          Bug - A problem which impairs or prevents the functions of the product. MDEV-35457 Remove btr_cur_t::path_arr

          • Major - Major loss of function.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-17111 Estimates are low for a condition that satisfies all the rows of an INNODB table

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-19424 InnoDB's records_in_range estimates are capped at about 50%

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-29835 Partial server freeze

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-30148 Race condition between non-persistent statistics and purge of InnoDB history

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-20169 main.partition_innodb fails in buildbot with wrong result

          • Major - Major loss of function.
          • Closed

          New Feature - A new feature of the product, which has yet to be developed. MDEV-21895 Refactor handler::records_in_range()

          • Critical - Crashes, loss of data, severe memory leak.
          • Stalled

          Bug - A problem which impairs or prevents the functions of the product. MDEV-30637 Mariadb server hangs

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-30648 btr_estimate_n_rows_in_range() accesses unfixed, unlatched page

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

          Activity

            Transition Time In Source Status Execution Times
            Vladislav Lesin made transition -
            Open In Progress
            		894d 15h 20m 1
            Vladislav Lesin made transition -
            In Progress Closed
            		80d 8h 47m 1

            People

              vlad.lesin Vladislav Lesin
              psergei Sergei Petrunia
              Votes:
              1 Vote for this issue
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              7 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved:

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