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Informix - Problem description

Problem IT31417 Status: Closed

HASH JOINS LEADING TO VARIOUS FAILURES

product:
INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10
Problem description:
The following failures were reported against a special build of
IDS 12.10.FC7W1 running on linux x86_64.

The problem appears to be platform independent.

There have been many variations of SQL that led to the failure,
some complex, and some more simple
queries against sysmaster.  In one case the trigger seemed to be
running low
on temp space, but that was not always the case for reported
assertions.  A couple SQL examples follow
that were against sysmaster database, but this database is not
necessary, just the hash join operation.

    select count(*) from sysmaster:syssesprof where longtxs = 1

    select
        dbsname,
        case
        when tab_name is NULL  then
           trim(tabname)
        else
           trim(tab_name)||':'||trim(tabname)
        end tabname ,
        bufreads,  pagreads, bufwrites,  lockreqs,  seqscans,
nrows
    from
        sysptprof p, sysptnhdr h, outer tabprof_tmp a
    where dbsname != 'sysmaster'
        and dbsname != 'sysutils'
        and tabname not in
('sysusers','sysindexes','syscolumns','TBLSpace')
        and p.partnum = h.partnum
        and trim(a.db_name) =trim(dbsname)
        and trim(a.idx_name)=trim(tabname)
    order by bufreads desc;

There have been a variety of similar stacks, some being like:

    afstack
    mt_ex_throw_sig
    afsig_handler
    
    next_row
    hash_process_all_groups
    unordered_group_by_next
    filltemp
    scan_open
    materialize_viewtmp
    materialize_viewtmp
    prepselect
   open_cursor
   sql_open
   sq_open
   sqmain
   th_init_initgls
   startup

   afstack
   mt_ex_throw_sig
   afsig_handler
   
   search_join_hash_table
   build_hash_table
   setup_new_environment
   hjoin_next
   sort_open
   filltemp
   scan_open
   materialize_viewtmp
   materialize_viewtmp
   materialize_viewtmp
   prepselect
   open_cursor
   sql_open
   sq_open
   sqmain
   spawn_thread
   th_init_initgls
   startup

   afstack
   afhandler
   affail_interface
   ptmapx
   hash_read_buffer
   hash_read_tuple
   hash_read_tuple_from_temp
   next_row
   hash_process_all_groups
   unordered_group_by_next
   filltemp
   scan_open
   materialize_viewtmp
   materialize_viewtmp
   prepselect
   open_cursor
   sql_open
   sq_open
   sqmain
   spawn_thread
   th_init_initgls
   startup

   afstack
  mt_ex_throw_sig
  afsig_handler
  
  search_join_hash_table
  setup_new_environment
  hjoin_next
  join_next
  join_next
  sort_open
  prepselect
  open_cursor
  sql_open
  sq_open
  sqmain
  spawn_thread
  th_init_initgls
  startup
Problem Summary:
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 12.10.xC14 and 14.10.xC4.  *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Update to Informix Server 12.10.xC14 or 14.10.xC4 (when      *
* available).                                                  *
****************************************************************
Local Fix:
Solution
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
06.01.2020
03.03.2020
29.05.2020
Problem solved at the following versions (IBM BugInfos)
12.10.xC14,
14.10.xC4
Problem solved according to the fixlist(s) of the following version(s)
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