The purpose of this tool is to measure how fast Informix/Onbar
can perform an archive(backup) without any overhead from the SM. When a backup
is taken, Onbar sends the data to this library instead of the Storage Manager.
This library does not store the data. It just throws it away.
How To Use:
To use this library you must compile the C
code to a shared library. Next you must insert a new rown into the
sysutils:bar_version table. The insert statement will look like the
insert into bar_version values ("1", "0.1.0", "mjt", "1");
Then set the Onconfig parameter
BAR_BSALIB_PATH to its new location (BAR_BSALIB_PATH /tmp/bsastub.so).
Once that is done you can perform a backup using your normal onbar
command (onbar -b, onbar -b -w, ...). You can measure the time it
takes for it to complete by looking at the BAR_ACT_LOG.
You should compare this time to the take it takes to do a backup WITH the Storage
Manager. If there is a significant difference in time, then the performance
bottleneck is in the Storage Manager.
When Onbar does a backup it records the completion of that backup in the sysutils
database and the $INFORMIXDIR/etc/ixbar. file. Onbar has no
knowledge that the data it sent to the library was "thrown away". Therefore,
once you are finished using this library, you should reset BAR_BSALIB_STUB to
it origional values and perform a "real" backup to you Storage Manager. That way,
if you had to perform a restore, Onbar would not try to retreive the backup it sent
to the baststub library
Not avalable yet. please email
firstname.lastname@example.org for an advanced copy.
Compiling the Source"
You must compile the source code to a "shared library". On Solaris platforms
the complie lines will look like the following"
Note: An eror will be generated from the first command. However the
bsastub.o will be produced which is what you need for the following ld command.
ld bsastub.o -G -o bsastub.so