Description:
While connected to mysql via ODBC, if you attempt to issue an UPDATE command, setting a field to the same value that it already using, you get the following error:
The OLE DB provider "MSDASQL" for linked server "test_linked_server" could not UPDATE table "[test_table]...[test_field]". The rowset was using optimistic concurrency and the value of a column has been changed after the containing row was last fetched or resynchronized.
OLE DB provider "MSDASQL" for linked server "test_linked_server" returned message "Row cannot be located for updating. Some values may have been changed since it was last read.".
How to repeat:
I have reproduced this on a separate server with the following settings:
MySql Version: 5.0.51a
MySQL ODBC 5.1 Driver Version: 05.01.0006 w/ the following flags:
Flags 1:
Allow big result sets
Use compression
Flags 2:
Don't cache results of forward-only cursors
Flags 3:
Read options from my.cnf
Allow multiple statements
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my.cnf contents
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#
# The MySQL database server configuration file.
#
# You can copy this to one of:
# - "/etc/mysql/my.cnf" to set global options,
# - "~/.my.cnf" to set user-specific options.
#
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html
# This will be passed to all mysql clients
# It has been reported that passwords should be enclosed with ticks/quotes
# escpecially if they contain "#" chars...
# Remember to edit /etc/mysql/debian.cnf when changing the socket location.
[client]
port = 6603
socket = /var/run/mysqld/mysqld.sock
# Here is entries for some specific programs
# The following values assume you have at least 32M ram
# This was formally known as [safe_mysqld]. Both versions are currently parsed.
[mysqld_safe]
socket = /var/run/mysqld/mysqld.sock
nice = 0
[mysqld]
#
# * Basic Settings
#
user = mysql
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
port = 6603
basedir = /usr
datadir = /data/mysql_data
tmpdir = /tmp
language = /usr/share/mysql/english
#skip-external-locking
#
# Instead of skip-networking you can listen only on
# localhost which is more compatible and is not less secure.
#bind-address = 127.0.0.1
#skip-networking
#
# * Fine Tuning
#
key_buffer = 16M
max_allowed_packet = 16M
thread_stack=128
thread_cache_size = 8
#max_connections = 100
# Changed from 8 to 1024.
table_cache = 1024
#thread_concurrency = 10
#
# * Query Cache Configuration
#
query_cache_limit = 1M
# query_cache_size changed from 16M
query_cache_size = 300M
#
# * Logging and Replication
#
# Both location gets rotated by the cronjob.
# Be aware that this log type is a performance killer.
#log = /var/log/mysql/mysql.log
#
# Error logging goes to syslog. This is a Debian improvement :)
#
# Here you can see queries with especially long duration
log_slow_queries = /var/log/mysql/mysql-slow.log
#long_query_time = 2
#log-queries-not-using-indexes
#
# The following can be used as easy to replay backup logs or for replication.
# note: if you are setting up a replication slave, see README.Debian about
# other settings you may need to change.
#server-id = 1
#log_bin = /var/log/mysql/mysql-bin.log
#log-slave-updates
#log-bin-index = /var/log/mysql/mysql-bin.index
#log-error = /var/log/mysql/error.log
#relay-log = /var/log/mysql/relay.log
#relay-log-info-file = /var/log/mysql/relay-log.info
#relay-log-index = /var/log/mysql/relay-log.index
#master-host = [master ip address]
#master-user = slave_user
#master-password = [place password here]
#replicate-do-db=dash
#replicate-do-db=mysql
#replicate-do-db=annieselke
#replicate-do-db=customer
#replicate-do-db=doctrine
#replicate-do-db=dsr
#replicate-do-db=dsr_dev
#replicate-do-db=graffiti
#replicate-do-db=mediawiki
#replicate-do-db=pch
#replicate-do-db=pinetar
#replicate-do-db=pinetask
#replicate-do-db=pinetask-live
#replicate-do-db=test
#replicate-do-db=webstats
#replicate-do-db=weta
#replicate-do-db=tracgraffiti
#replicate-do-db=tracpch
#replicate-do-db=tracannie
#replicate-do-db=tracdash
#replicate-do-db=tracdsr
#replicate-do-db=tracmailer
#replicate-do-db=tracpinetar
#replicate-do-db=tracresq
#replicate-do-db=tracreports
#replicate-do-db=tracdoc
#replicate-do-db=tracprojects
#replicate-do-db=tracmot
#replicate-do-db=tracmarketng
#expire_logs_days = 10
#max_binlog_size = 100M
#binlog_do_db = include_database_name
#binlog_ignore_db = include_database_name
#
# * BerkeleyDB
#
# Using BerkeleyDB is now discouraged as its support will cease in 5.1.12.
skip-bdb
#
# * InnoDB
#
# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
# Read the manual for more InnoDB related options. There are many!
# You might want to disable InnoDB to shrink the mysqld process by circa 100MB.
#skip-innodb
#
# * Security Features
#
# Read the manual, too, if you want chroot!
# chroot = /var/lib/mysql/
#
# For generating SSL certificates I recommend the OpenSSL GUI "tinyca".
#
# ssl-ca=/etc/mysql/cacert.pem
# ssl-cert=/etc/mysql/server-cert.pem
# ssl-key=/etc/mysql/server-key.pem
#The bigger you set this the less disk I/O is needed to access data in tables. On a dedicated database server you may set this parameter up to 80% of the machine physical memory size. Do not set it too large, though, because competition of the physical memory may cause paging in the operating system.
# Changed from 200M
innodb_buffer_pool_size=300M
#Allow connections via named pipes (Windows NT+ only). Note: you can specify a pipe name on the advanced network page, if required.
#enable-named-pipe
#Set the default character set.
default-character-set=cp1250
#Set the default collation.
default-collation=cp1250_general_ci
[mysqldump]
quick
quote-names
max_allowed_packet = 16M
[mysql]
#no-auto-rehash # faster start of mysql but no tab completition
[isamchk]
key_buffer = 16M
#
# * NDB Cluster
#
# See /usr/share/doc/mysql-server-*/README.Debian for more information.
#
# The following configuration is read by the NDB Data Nodes (ndbd processes)
# not from the NDB Management Nodes (ndb_mgmd processes).
#
# [MYSQL_CLUSTER]
# ndb-connectstring=127.0.0.1
#
# * IMPORTANT: Additional settings that can override those from this file!
#
!includedir /etc/mysql/conf.d/
# Setting added by Brett on 8.13.08 for, hopefully, optimization
innodb_flush_log_at_trx_commit=2
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Connect to the odbc via any method. In the example below I used Microsoft SQL Server 2005 via linked server. The same works with Microsoft Access and presumably via any other ODBC based query.
Issue the following command:
update test_linked_server...test_table
set test_field = 'foo' where test_field = 'foo'
update mysql_dsr_dev...container
set status = 'received' where id = 130
