|
Problem IC84554
|
Status: Closed |
DB2 MIGHT ENCOUNTER 'DEADLOCK' ERROR WHEN PERFORMING TWO DROP TABLE STATEMENTS SIMULTANEOUSLY. |
| product: |
DB2 FOR LUW / DB2FORLUW / A10 - DB2 |
| Problem description: |
When concurrently perform two DROP TABLE statements on different
tables but with similar namings, the two statements may lead to
various kinds of deadlocks:
-- deadlock among the catalog tables, SYSIBM.SYSVIEWDEP and
SYSIBM.SYSTABAUTH
-- deadlock among the catalog tables, SYSIBM.SYSVIEWS and
SYSIBM.SYSVIEWS
The problem is more likely to happen if the tables being dropped
have dependent views and other objects (e.g. index or trigger)
defined on it.
To identify the problem, you need to use DB2 event monitor to
collect detailed information for deadlocks.
When the deadlock error occurs, in the event monitor output you
will see the following entries:
=============================================
Table of lock waited on : SYSVIEWDEP
Schema of lock waited on : SYSIBM
Type of lock: Row
Mode of lock: X - Exclusive
Mode application requested on lock: S - Share
Text : drop table NEWTON.T1
Table of lock waited on : SYSTABAUTH
Schema of lock waited on : SYSIBM
Type of lock: Row
Mode of lock: U - Update
Mode application requested on lock: X - Exclusive
Text : drop table NEWTON.T2
=============================================
or
=============================================
Table of lock waited on : SYSVIEWS
Schema of lock waited on : SYSIBM
Type of lock: Row
Mode of lock: U - Update
Mode application requested on lock: U - Update
Text : drop table NEWTON.T1
Table of lock waited on : SYSVIEWS
Schema of lock waited on : SYSIBM
Type of lock: Row
Mode of lock: X - Exclusive
Mode application requested on lock: U - Update
Text : drop table NEWTON.T2
=============================================
or
=============================================
Table of lock waited on : SYSVIEWS
Schema of lock waited on : SYSIBM
Type of lock: Row
Mode of lock: U - Update
Mode application requested on lock: X - Exclusive
Text : drop table NEWTON.T1
Table of lock waited on : SYSVIEWS
Schema of lock waited on : SYSIBM
Type of lock: Row
Mode of lock: U - Update
Mode application requested on lock: U - Update
Text : drop table NEWTON.T2
============================================= |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* All users of version 10.1 on Linux, Unix and Windows *
* platforms. *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Upgrade to DB2 UDB Version 10.1 FixPak 1 or higher levels. *
**************************************************************** |
| Local Fix: |
Perform the two DROP TABLE statements sequentially. |
| available fix packs: |
DB2 Version 10.1 Fix Pack 1 for Linux, UNIX, and Windows
DB2 Version 10.1 Fix Pack 2 for Linux, UNIX, and Windows
DB2 Version 10.1 Fix Pack 3 for Linux, UNIX, and Windows
DB2 Version 10.1 Fix Pack 4 for Linux, UNIX, and Windows
DB2 Version 10.1 Fix Pack 3a for Linux, UNIX, and Windows
DB2 Version 10.1 Fix Pack 6 for Linux, UNIX, and Windows
|
| Solution |
First fixed in DB2 UDB Version 10.1 FixPak 1. |
| Workaround |
Perform the two DROP TABLE statements sequentially. |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 14.06.2012
23.06.2013
23.06.2013 |
| Problem solved at the following versions (IBM BugInfos) |
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 10.1.0.1
|
 |
| 10.5.0.1
|
|
