Re: ERROR: left link changed unexpectedly

Anyone interested ?

Regards
Gaetano Mendola

Gaetano Mendola wrote:
> Hi all,
> in my development server running a 7.4.5 I can replicate
> continuously this error:
>
> ERROR: left link changed unexpectedly
>
> I obtain this with a vacuum full:
>
>
> test=# vacuum full verbose ua_user_data_exp;
> INFO: vacuuming "public.ua_user_data_exp"
> INFO: "ua_user_data_exp": found 361471 removable, 20867 nonremovable
> row versions in 28373 pages
> DETAIL: 0 dead row versions cannot be removed yet.
> Nonremovable row versions range from 432 to 1060 bytes long.
> There were 0 unused item pointers.
> Total free space (including removable row versions) is 218782956 bytes.
> 26761 pages are or will become empty, including 0 at the end of the table.
> 27543 pages containing 218591140 free bytes are potential move
> destinations.
> CPU 1.73s/0.40u sec elapsed 17.66 sec.
> INFO: index "exp_id_provider" now contains 20867 row versions in 1077
> pages
> DETAIL: 0 index row versions were removed.
> 1003 index pages have been deleted, 1003 are currently reusable.
> CPU 0.05s/0.06u sec elapsed 4.87 sec.
> INFO: index "exp_ci_login" now contains 20867 row versions in 1832 pages
> DETAIL: 0 index row versions were removed.
> 866 index pages have been deleted, 866 are currently reusable.
> CPU 0.18s/0.02u sec elapsed 12.96 sec.
> ^[INFO: index "exp_country" now contains 20867 row versions in 1341 pages
> DETAIL: 0 index row versions were removed.
> 1187 index pages have been deleted, 1187 are currently reusable.
> CPU 0.11s/0.05u sec elapsed 5.89 sec.
> INFO: index "exp_os_type" now contains 20867 row versions in 1333 pages
> DETAIL: 0 index row versions were removed.
> 1237 index pages have been deleted, 1237 are currently reusable.
> CPU 0.05s/0.03u sec elapsed 5.84 sec.
> INFO: index "exp_card" now contains 20867 row versions in 1417 pages
> DETAIL: 0 index row versions were removed.
> 1288 index pages have been deleted, 1288 are currently reusable.
> CPU 0.09s/0.02u sec elapsed 6.14 sec.
> ERROR: left link changed unexpectedly
>
>
>
> last lines in the logs ( with verbose on ):
>
>
> Oct 1 21:35:31 porto postgres[31356]: [1268-5] LOCATION: vacuum_index,
> vacuum.c:2728
> Oct 1 21:35:38 porto postgres[31356]: [1269-1] ERROR: XX000: left link
> changed unexpectedly
> Oct 1 21:35:38 porto postgres[31356]: [1269-2] LOCATION: _bt_pagedel,
> nbtpage.c:888
>
>
> I don't care to fix the problem immediatelly, so if you want dig on it
> let me
> know.
>
> Regards
> Gaetano Mendola
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