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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

            Ascending order - Click to sort in descending order
            psergei Sergei Petrunia created issue -
            psergei Sergei Petrunia made changes -
            Field Original Value New Value
            Assignee Marko Mäkelä [ marko ]
            psergei Sergei Petrunia made changes -
            Labels records_in_range
            psergei Sergei Petrunia made changes -
            psergei Sergei Petrunia made changes -
            julien.fritsch Julien Fritsch made changes -
            Fix Version/s 10.2 [ 14601 ]
            Fix Version/s 10.3 [ 22126 ]
            Fix Version/s 10.4 [ 22408 ]
            marko Marko Mäkelä made changes -
            marko Marko Mäkelä made changes -
            marko Marko Mäkelä made changes -
            Assignee Marko Mäkelä [ marko ] Eugene Kosov [ kevg ]
            marko Marko Mäkelä made changes -
            Fix Version/s 10.5 [ 23123 ]
            Fix Version/s 10.6 [ 24028 ]
            Affects Version/s 10.5 [ 23123 ]
            Affects Version/s 10.6 [ 24028 ]
            serg Sergei Golubchik made changes -
            Fix Version/s 10.6 [ 24028 ]
            serg Sergei Golubchik made changes -
            Workflow MariaDB v3 [ 101388 ] MariaDB v4 [ 141661 ]
            marko Marko Mäkelä made changes -
            Assignee Eugene Kosov [ kevg ] Vladislav Lesin [ vlad.lesin ]
            vlad.lesin Vladislav Lesin made changes -
            Status Open [ 1 ] In Progress [ 3 ]
            vlad.lesin Vladislav Lesin made changes -
            Fix Version/s 10.6 [ 24028 ]
            Fix Version/s 10.7 [ 24805 ]
            Fix Version/s 10.8 [ 26121 ]
            Fix Version/s 10.9 [ 26905 ]
            Fix Version/s 10.10 [ 27530 ]
            Fix Version/s 10.2 [ 14601 ]
            Fix Version/s 10.3 [ 22126 ]
            Fix Version/s 10.4 [ 22408 ]
            Fix Version/s 10.5 [ 23123 ]
            vlad.lesin Vladislav Lesin made changes -
            Fix Version/s 10.6.9 [ 27507 ]
            Fix Version/s 10.7.5 [ 27505 ]
            Fix Version/s 10.8.4 [ 27503 ]
            Fix Version/s 10.9.2 [ 27115 ]
            Fix Version/s 10.10.0 [ 27912 ]
            Fix Version/s 10.6 [ 24028 ]
            Fix Version/s 10.7 [ 24805 ]
            Fix Version/s 10.8 [ 26121 ]
            Fix Version/s 10.9 [ 26905 ]
            Fix Version/s 10.10 [ 27530 ]
            Resolution Fixed [ 1 ]
            Status In Progress [ 3 ] Closed [ 6 ]
            marko Marko Mäkelä made changes -
            marko Marko Mäkelä made changes -
            marko Marko Mäkelä made changes -
            marko Marko Mäkelä made changes -
            mariadb-jira-automation Jira Automation (IT) made changes -
            Zendesk Related Tickets 107568
            vlad.lesin Vladislav Lesin made changes -

            People

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

              Dates

                Created:
                Updated:
                Resolved:

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