Recommended ODBC Drivers for 7.0.3 MobiLink
The MobiLink server uses ODBC 3.0 to connect to the
consolidated database. The information presented here is intended to help you
choose which ODBC driver to use with your consolidated database.
In theory MobiLink should be able to use as a
consolidated database any ODBC 3.0 data source that supports the optional
ODBC functionality required by MobiLink, but in practice ODBC implementations
vary widely.
Different ODBC drivers have different capabilities, and the MobiLink server
attempts to adapt to these by querying the driver. Typically the driver also
has behavior (or bugs) that can't be detected by querying the driver. For
these we test the driver in an attempt to find viable workarounds.
Some workarounds are used for different consolidated database vendors, while
others are specific to a vendor and even a specific version.
Once we have identified a set of workarounds that are
required for a driver, we update the MobiLink server so that it recognizes
the version of the driver, and automatically associates the set of
workarounds with that version.
For some ODBC drivers, we are not able to develop viable
workarounds for all issues. In these cases, you still may be able to use the
driver if your synchronizations do not require the missing
driver functionality.
For ease of testing, and to allow MobiLink to apply
workarounds to drivers that it does not recognize, the MobiLink workarounds
can be set by the undocumented –hw command-line switch. This switch
and its associated workarounds are not documented because indiscriminate
use of workarounds could cause data corruption or software errors.
IF YOU USE UNDOCUMENTED SWITCHES, YOU DO SO ENTIRELY AT YOUR OWN RISK.
Note that after workaround sets are identified, we can make future versions
of MobiLink apply the associated hidden workaround switches
automatically.
Thus if you chose to use hidden
workarounds directly, you may not need them with newer versions of the
MobiLink server. Continued use of hidden switches with a newer MobiLink
may even cause problems or reduced performance.
Driver testing
We use two types of testing of ODBC drivers with MobiLink.
The first, referred to as MLR, is a comprehensive suite of regression tests
that exercise synchronization functionality. If some specific
MLR tests fail, the driver may still be suitable as long as your
synchronizations do not rely on the functionality that failed. For example,
if the only MLR tests that fail are for synchronization of LONG BINARY data,
then the driver may still be suitable for you if you are not using MobiLink
to synchronize LONG BINARY data.
The second type of testing, referred to as MLB, is high-load
testing involving many clients synchronizing simultaneously with a MobiLink
server running on a multi-processor computer. We have found that some drivers
will fail with multiple simultaneous connections or under high load while
running on multiple processors. In these cases, you may need to restrict
MobiLink to run on a single processor (via the –zt 1 switch) or
limit it to a single worker thread (via the –w 1 switch).
Recommended Drivers
As a result of our testing, we recommend the following ODBC
drivers for use with version 7.0.3 of the MobiLink server. Unless specified
otherwise, the recommendations refer to the Windows version of MobiLink.
The following sections list the recommended ODBC driver for
different types of consolidated database. In some cases, alternative drivers
are also listed. Click on one of the consolidated DBMS types below to see
recommended driver information for using MobiLink with that type of DBMS:
Sybase Adaptive Server Anywhere (ASA)
Sybase Adaptive Server
Enterprise (ASE)
Oracle 8 and 8i
Microsoft SQL Server 7 and 2000
IBM DB2 UDB 5.2, 7.1
Sybase Adaptive Server Anywhere (ASA)
|
Driver
|
Adaptive Server Anywhere 7.0
|
|
Version
|
7.0.3
|
|
Status
|
Recommended for use with MobiLink.
|
|
Client s/w
|
None.
|
|
OS
|
Win32, Solaris, Linux
|
|
Workarounds applied by MobiLink
|
-hwc+o+
|
|
Other required workarounds
|
None
|
|
Pros
|
All MLR and MLB tests pass.
|
|
Cons
|
None.
|
|
Notes
|
The MLR tests all pass with the ODBC driver included with ASA, and the
MLB testing shows no problems with multiple clients simultaneously
synchronizing through a MobiLink server running on a multi-processor
computer.
|
ASA 6.0.4, 7.0.0, 7.0.1 and 7.0.2 drivers also work with MobiLink
without additional workarounds.
Sybase Adaptive Server Enterprise
(ASE)
|
Driver
|
Sybase ASE ODBC Driver
|
|
Version
|
3.50.00.10
|
|
Status
|
Recommended for use with MobiLink.
|
|
Client s/w
|
Open Client 12.0
|
|
OS
|
Win32, Solaris
|
|
Workarounds applied by MobiLink
|
–hwf+i+j+t+v+w+A+
|
|
Other required workarounds
|
-hwC+
|
|
Pros
|
All MLR and MLB tests pass
|
|
Cons
|
This driver's upload performance can degrade significantly when there are
many download_cursor and download_delete_cursor scripts that contain
many columns. The -hwC+ workaround prevents this problem.
|
|
Notes
|
For ASE version 11.9.2 or 12,
we recommend using the 12.0 Open Client software and the
Sybase ASE ODBC driver version 3.50.00.10.
|
|
Driver
|
Sybase iAnywhere - Sybase ASE ODBC Driver
Merant DataDirect Connect ODBC Driver for Sybase ASE
|
|
Version
|
3.70sp1(3.70.00.15 in ODBC Administrator)
|
|
Status
|
Recommended for use with MobiLink with caveats.
|
|
Client s/w
|
|
|
OS
|
Win32, Solaris, Linux
|
|
Workarounds applied by MobiLink
|
?hwf+i+j+t+v+w+A+
|
|
Other required workarounds
|
None
|
|
Pros
|
Most MLR tests and all MLB tests pass.
|
|
Cons
|
Long varchar tests failed. Some tests related to numeric
data type fail showing "Dynamic SQL error, prepared statement
does not exist" in the MobiLink log.?Some tests fail showing "Unclosed
quote before the character string 'xx' " in the MobiLink log.
Cause of this failure is under investigation.
|
|
Notes
|
For Solaris and Linux platforms, this driver is the best
choice, for Win32, the best choice is Sybase ASE ODBC Driver.
When setting up the DSN, set the "Enable Describe Parameter" option.
|
Oracle 8 and 8i
We have found the greatest variability
between driver versions with Oracle's ODBC drivers. In many
cases, new bugs have appeared in subsequent versions of the
ODBC driver so if you have an Oracle ODBC driver that works
for you, then we recommend that you continue to use it. Most
Oracle ODBC drivers seem to have multi-threading issues.
|
Driver
|
Sybase iAnywhere - Oracle ODBC Driver
Merant DataDirect Connect ODBC Driver for Oracle
|
|
Version
|
3.70 and 3.7sp1
|
|
Status
|
Recommended for use with MobiLink with caveats.
|
|
Client s/w
|
Net8 8.1.6.0.0
|
|
OS
|
Win32, Solaris
|
|
Workarounds applied by MobiLink
|
-hwf+i+k+n+w+A+
|
|
Other required workarounds
|
None
|
|
Pros
|
Passes most MLR tests.
Passes MLB tests.
|
|
Cons
|
Some MLR tests involving LONG VARCHAR columns failed.
Driver has problems with double-hyphen comments and
unnecessary semicolons. This driver problem has been
reported to Merant.
|
|
Notes
|
For some of the MLR tests, the
"SQLDescribeParam" option needs to be enabled for the
driver, but it is not needed for the MLB tests.
In the MLB tests, the Merant driver
is significantly faster than the Oracle 8.0.5.8 driver
for synchronizing downloads but somewhat slower for
uploads. The driver works in the MLB tests under high
load on multiple processors, but the performance benefit
of using multiple processors is small: we found that
throughput decreased somewhat when using more than two
processors.
|
|
Driver
|
Oracle ODBC Driver
|
|
Version
|
8.0.5.8.0
|
|
Status
|
Recommended for use with MobiLink with caveats.
|
|
Client s/w
|
Net8 8.0.5.0.0 or 8.0.5.0.3
|
|
OS
|
Win32
|
|
Workarounds applied by MobiLink
|
–hwd+h+k+r+s+
|
|
Other required workarounds
|
?zt 1 (to restrict execution to a single processor)
|
|
Pros
|
Passes MLR tests.
Passes MLB tests when run on a single processor.
|
|
Cons
|
Fails MLB tests when run on multiple processors.
|
|
Notes
|
The most functional ODBC driver from
Oracle that we have tested is version 8.0.5.8.0, when
used with Net8 version 8.0.5.0.0. This driver passes all
MLR tests, and as long as it is not run on multiple
processors it also works for the MLB tests. When run
under high load from multiple connections on multiple
processors, an application exception will eventually
occur in an Oracle ODBC driver DLL. Typically this
occurs as an unknown exception (0xebad0000) in
ORA805.DLL (which is called from OCI.DLL). On a
multiple-processor computer, you can restrict MobiLink
(and hence the ODBC driver) to execute on a single
processor by using the ?zt 1 MobiLink command-line
option.
The problem with multiple processors
also happens when the Net8 client is updated to version
8.0.5.0.3.
|
|
Driver
|
Oracle ODBC Driver
|
|
Version
|
8.0.5.10.0
|
|
Status
|
Not recommended for use with MobiLink.
|
|
Client s/w
|
Net8 8.0.5.0.0
|
|
OS
|
Win32
|
|
Workarounds applied by MobiLink
|
–hwd+f+h+k+p+r+s+
|
|
Other required workarounds
|
–hwp-q+
|
|
Pros
|
Passes most MLR tests.
|
|
Cons
|
Fails a few MLR tests with "ORA-933:
SQL command not properly ended" errors.
Fails MLR
tests for LONG VARCHAR and LONG BINARY with "ORA-24801:
illegal parameter value in OCI lob function" errors.
Fails MLB tests with "option value changed" and
"Invalid attribute/option identifier <0>" errors.
|
|
Notes
|
We were unable to determine the
cause of the ORA-933 errors in the MLR tests.
With version 8.0.5.10.0 of the
Oracle ODBC driver, the MLB tests could not be run at
all. The tests failed from driver errors about invalid
attribute/option identifier and changed option values.
The same problem occurs with version 8.0.5.9.0 of the
Oracle ODBC driver.
We have not been able to determine a
viable workaround for these issues, but we are aware
that some customers are able to use this driver
successfully.
|
|
Driver
|
Oracle ODBC Driver
|
|
Version
|
8.1.6.2.0
|
|
Status
|
Not recommended for use with MobiLink.
|
|
Client s/w
|
Net8 8.1.6.0.0
|
|
OS
|
Win32
|
|
Workarounds applied by MobiLink
|
None
|
|
Other required workarounds
|
–hwd+r+ –s 1
|
|
Pros
|
Passes most MLR tests.
|
|
Cons
|
Fails MLR tests for LONG VARCHAR and
LONG BINARY columns.
MLR test with REAL columns
failed because values uploaded were slightly different
when downloaded.
Need to disable bulk fetching (via
?s 1). Since rows must be fetched one at a time download
performance is adversely affected.
|
|
Notes
|
MLB tests have not been performed
with this driver. It may have multi-threaded problems as
do all the Oracle ODBC drivers for which we have been
able to do MLB testing.
|
|
Driver
|
Oracle ODBC Driver
|
|
Version
|
8.1.7.0.0
|
|
Status
|
Not recommended for use with MobiLink.
|
|
Client s/w
|
Net8 8.1.7.0.0
|
|
OS
|
Win32
|
|
Workarounds applied by MobiLink
|
None
|
|
Other required workarounds
|
–hwd+h+k+r+
|
|
Pros
|
Passes most MLR tests.
|
|
Cons
|
Fails MLR tests for LONG VARCHAR and
LONG BINARY with "ORA-24801: illegal parameter value in
OCI lob function" errors.
Fails MLB tests with
"option value changed" and "Invalid attribute/option
identifier <0>" errors.
|
|
Notes
|
With version 8.1.7.0.0 of the Oracle
ODBC driver (and Net8 8.1.7.0.0), the MLB tests could
not be run at all. The tests failed from driver errors
about invalid attribute/option identifier and changed
option values.
We have not been able to determine a
viable workaround for this issue, but we are aware that
some customers are able to use this driver successfully.
|
|
Driver
|
Oracle ODBC Driver
|
|
Version
|
8.1.7.2.0
|
|
Status
|
Not recommended for use with MobiLink.
|
|
Client s/w
|
Net8 8.1.7.0.0
|
|
OS
|
Win32
|
|
Workarounds applied by MobiLink
|
None
|
|
Other required workarounds
|
–hwd+h+k+n+r+
|
|
Pros
|
Passes most MLR tests. Passes MLB
tests when run with a single MobiLink worker thread.
|
|
Cons
|
Fails many MLR tests when executing
a stored procedure that is part of the setup for several
tests.
Fails MLB tests with conversion errors when
run with multiple MobiLink worker threads.
|
|
Notes
|
Version 8.1.7.2.0 of the Oracle ODBC
driver (with Net8 8.1.7.0.0) tends to fail with multiple
simultaneous synchronizations even when running only on
a single processor. Therefore we do not recommend it.
The failure typically occurs as a conversion error
("ORA-01461 can bind a LONG value only for insert into a
LONG column" or "ORA-01460 unimplemented or unreasonable
conversion requested").
You can restrict it to work on only
one synchronization at a time by limiting the number of
MobiLink worker threads to one (via ?w 1), but this
will seriously limit throughput performance.
|
Microsoft SQL Server 7 and 2000
Important: With any
version of SQL Server, you should specify "SET NOCOUNT ON" as
the first statement in all stored procedures or SQL batches
executed via ODBC. Without this option, a "number of rows
affected" message is sent to MobiLink for each statement
executed. If you are doing a relatively large number of
inserts, updates, and select into statements, these messages
can fill network buffers resulting in data being lost
without any warning.
|
Driver
|
Microsoft SQL Server ODBC Driver
|
|
Version
|
3.60.03.19 (for SQL Server 7)
2000.80.194.00 (for SQL Server 2000)
|
|
Status
|
Recommended for use with MobiLink.
|
|
Client s/w
|
None
|
|
OS
|
Win32
|
|
Workarounds applied by MobiLink
|
?hwq+ (for MSS 7)
?hwq+C+ (for MSS 2000)
|
|
Other required workarounds
|
None
|
|
Pros
|
Passes MLR and MLB tests.
|
|
Cons
|
None
|
|
Notes
|
The MLR tests all pass with the ODBC
drivers included with Microsoft SQL Server 7 and
2000. MLB tests run with these drivers when the NOCOUNT
option was set for all stored procedures.
|
|
Driver
|
Sybase iAnywhere - SQL Server ODBC Driver
Merant DataDirect Connect ODBC Driver for SQL Server
|
|
Version
|
3.7 and 3.7 sp1
|
|
Status
|
Recommended for use with MobiLink.
|
|
Client s/w
|
None
|
|
OS
|
Win32, Solaris, Linux
|
|
Workarounds applied by MobiLink
|
?hwq+ (for MSS 7)
?hwq+C+
(for MSS 2000)
|
|
Other required workarounds
|
None
|
|
Pros
|
Passes MLR and MLB tests.
|
|
Cons
|
None
|
|
Notes
|
For Solaris, Version 3.7 is provided and recommended.
For Win32 and Linux, Version 3.7 sp1 is provided and recommended.
|
IBM DB2 UDB 7.1 , 5.2
|
Driver
|
IBM DB2 UDB 7.1ODBC driver
|
|
Version
|
Driver is included with IBM DB2 UDB 7.1.
|
|
Status
|
Recommended for use with MobiLink.
|
|
Client s/w
|
7.01.0000
|
|
OS
|
Win32
|
|
Workarounds applied by MobiLink
|
?hwf+h+n+u+A+
|
|
Other required workarounds
|
None
|
|
Pros
|
Passes most MLR tests.
|
|
Cons
|
Long varchar,?long binary, clob, blob, and binary tests fail.?
SQLBulkOperatons function fails when dealing with clob and blob.
|
|
Notes
|
MLB tests have not been run with this driver.
|
|
Driver
|
IBM DB2 UDB 5.2 ODBC driver
|
|
Version
|
Driver is included with IBM DB2 UDB 5.2.
|
|
Status
|
Recommended for use with MobiLink.
|
|
Client s/w
|
5.02.0000
|
|
OS
|
Win32
|
|
Workarounds applied by MobiLink
|
–hwf+h+n+u+
|
|
Other required workarounds
|
None
|
|
Pros
|
Passes MLR tests.
|
|
Cons
|
Long varchar,?long binary, clob, blob, and binary tests fail.?
SQLBulkOperatons function fails when dealing with clob and blob.
|
|
Notes
|
MLB tests have not been run with this driver.
|
|
Driver
|
Merant DataDirect Connect ODBC Driver for IBM DB2 UDB
|
|
Version
|
3.7 and 3.7 sp1
|
|
Status
|
Not Recommended for use with MobiLink.
|
|
Client s/w
|
5.02.0000, 7.01.0000
|
|
OS
|
Win32
|
|
Workarounds applied by MobiLink
|
?hwf+h+n+u+
|
|
Other required workarounds
|
None
|
|
Pros
|
The MLR will not run due to single connection limitation.
|
|
Cons
|
None
|
|
Notes
|
Merant DataDirect Connect ODBC Driver for DB2 both version 3.7 and
3.7sp1 are not recommended for use with MobiLink. Version 3.7
only supports one connection and short schema name ( Less than 18
characters ). Merant says Version 3.7 sp1 supports multiple connections
and long schema name. However there is an application exceptions
when using MobiLink when using Merant ODBC Driver for DB2.
MLB tests have not been run with this driver.
|
|
