db cfg: CATALOGCACHE_SZ obscurites.

[Konstantin Andreev]

Hello there.

1) According to documentation, setting
CATALOGCACHE_SZ = -1 means CATALOGCACHE_SZ = (MAXAPPLS*4)

But MAXAPPLS is set to AUTOMATIC, this means "no limit" or "no value". Again, according to documentation, CATALOGCACHE_SZ is allocated "when the database is initialized". Hence, I'm interesting, which value is really allocated instead of illusion (<no limit>*4).

"get db cfg" command does not help here, because literally displays "(MAXAPPLS* 4)".

2) There would be no room for question (1) if I have a way to reliably check CATALOGCACHE_SZ value. But I have inconsistent results:
_______________ _______________ _______________ __
| |CATALOG | "catcacheh" (token of db2mtrk -d)
MAXAPPLS|CACHE_ SZ| shown | I would expect...
--------+--------+--------+--------------------
(ignore) 100 192,0K 4K*100 = 400K
20 -1 64,0K 4K*(20*4) = 320K
AUTOMAT -1 64,0K (no assumptions)
-----------------------------------------------

Hence, I'm intresting, how are related CATALOGCACHE_SZ db config parameter, "catcacheh" token of db2mtrk, and real catalog cache size ?
--
Konstantin Andreev.

[Jan M. Nelken]

Konstantin Andreev wrote:

Hello there.

1) According to documentation, setting
CATALOGCACHE_SZ = -1 means CATALOGCACHE_SZ = (MAXAPPLS*4)

But MAXAPPLS is set to AUTOMATIC, this means "no limit" or "no
value". Again, according to documentation, CATALOGCACHE_SZ is allocated
"when the database is initialized". Hence, I'm interesting, which value
is really allocated instead of illusion (<no limit>*4).

AUTOMATIC does not mean "no limit" or "no value".

Did you try DB2 GET DB CFG FOR <aliasSHOW DETAIL?
Jan M. Nelken

[The Boss]

Konstantin Andreev wrote:

Hello there.

1) According to documentation, setting
CATALOGCACHE_SZ = -1 means CATALOGCACHE_SZ = (MAXAPPLS*4)

But MAXAPPLS is set to AUTOMATIC, this means "no limit" or "no
value". Again, according to documentation, CATALOGCACHE_SZ is
allocated "when the database is initialized". Hence, I'm interesting,
which value is really allocated instead of illusion (<no limit>*4).

AUTOMATIC doesn't mean "no limit" or "no value", it means the value is
determined by DB2 and dynamically adapted depending on circumstances.

>
"get db cfg" command does not help here, because literally
displays "(MAXAPPLS* 4)".

Try the autoconfigure command instead, with the no-apply option, like this:

db2 autoconfigure using MAXAPPLS CATALOGCACHE_SZ apply none

It will show both the formula and the actual value.

HTH.

--
Jeroen

[Konstantin Andreev]

Thank everybody!

AUTOMATIC does not mean "no limit" or "no value". Did you try DB2 GET DB CFG FOR <aliasSHOW DETAIL?

"Show detail", of course! I've absolutely forgotten it.
--
Konstantin Andreev.

[Jan M. Nelken]

Konstantin Andreev wrote:

"Show detail", of course! I've absolutely forgotten it.

You could also use:

db2pd -db <alias-dbcfg

and grep (or find) keyword you need:
For orthodox Windows believers:

db2pd -db sample -dbcfg | find /i "maxappls"
For progressive Windows believers (who downloaded grep for Windows) and
Unix followers:

db2pd -db smple -dbcfg | grep -i maxappls
Jan M. Nelken

[Konstantin Andreev]

Jan M. Nelken wrote:

You could also use:
db2pd -db <alias-dbcfg

db2pd is my postponed headache. It just exits silently in my system. No complains/error messages, exit code is always zero, and random command line arguments does not change this ("db2pdcfg" behaves the same). So I should leave without it.

For progressive Windows believers (who downloaded grep for Windows)
db2pd -db smple -dbcfg | grep -i maxappls

For everybody, who has wrote more than one or two scripts for Windows, installing a proper set of unix utilities under Windows is a must. sed, awk, grep,... all are should be here.
--
Konstantin Andreev.

[Jan M. Nelken]

Konstantin Andreev wrote:

db2pd is my postponed headache. It just exits silently in my system. No
complains/error messages, exit code is always zero, and random command
line arguments does not change this ("db2pdcfg" behaves the same). So I
should leave without it.

As the wise man said: We will not fix problems we don't know about...

Can you capture system calls trace on some trivial invocation of db2pd,
for example:

db2pd -db sample -dbcfg

Make sure you get this on supported Linux distribution - see
http://www-306.ibm.com/software/data...inux/validate/ for details.

For DB2 V9 32-bit platform this would be RHEL 4, RHEL 5, SLES 9, SLES 10
and Novell Open Enterprise Server 9.

For each of those distributions specific kernel level and/or libraries
levels may be required.

Jan M. Nelken

[Konstantin Andreev]

On Jun 4, 10:02 pm, "Jan M. Nelken" wrote:

db2pd is my postponed headache. It just exits silently in my system. No complains/error messages, exit code is always zero, and random command line arguments does not change this.

As the wise man said: We will not fix problems we don't know about...

Certainly...

>
Can you capture system calls trace on some trivial invocation of db2pd, for example:

db2pd -db sample -dbcfg

| avalon ~ # strace db2pd -db psftprod -dbcfg 2>&1 | wc -l
| 445

It's a lot of output, I am not sure, is it appropriate to post the
trace to group? The traces are identical (accurate within memory
addresses) on invocations of db2pd with random arguments. The most
suspicios call is third preceding exit:

| access("/db2/srv/dbi/sqllib/lib/libdb2fmtdmp.so ", F_OK) = -1 ENOENT
| setuid32(0) = 0
| exit_group(0) = ?

I've checked the DB2 v9 installation pack, there is no such file in
it.

Make sure you get this on supported Linux distribution

Too bad, I have only one installation of v9, and this linux distro
(gentoo) is not officially supported. If your time permits analyzing
this problem, I gratefully supply any required details (kernel,
libraries, and so on...).

I believe this in not distro related problem. Most likely, some simple
misconfiguratio n.
--
Konstantin Andreev.

[Jan M. Nelken]

Konstantin Andreev wrote:

It's a lot of output, I am not sure, is it appropriate to post the
trace to group? The traces are identical (accurate within memory
addresses) on invocations of db2pd with random arguments. The most
suspicios call is third preceding exit:

| access("/db2/srv/dbi/sqllib/lib/libdb2fmtdmp.so ", F_OK) = -1 ENOENT
| setuid32(0) = 0
| exit_group(0) = ?

I've checked the DB2 v9 installation pack, there is no such file in
it.

Please also run this:

db2pd -v -debug db2pddbg

and include db2pddbg file with strace output.
You can uplaod compressed output to ftp server:

ftp.software.ib m.com

into directory

/ps/toibm/db2

as file:

stuuf4jun.gz

and I will have a look.
As for libdb2fmtdmp.so - this library is used for formatting internal
data structures. On customer systems internal data are written as hex dump.
This library is not needed in your case - it's not shipped to customers.
Jan M. Nelken

[Konstantin Andreev]

Jan M. Nelken wrote:

>It's a lot of output, I am not sure, is it appropriate to post the trace to group?

You can uplaod compressed output to ftp server:
ftp.software.ib m.com
into directory
/ps/toibm/db2

| # ftp ftp://ftp.software.ibm.com/
| Current remote directory is /.
| ncftp / cd /ps/toibm/db2
| Could not chdir to /ps/toibm/db2: server said: toibm: No such file or directory.
I've overlooked the /ps directory, but could not find something simular to 'toibm'. Looks like you mistyped the URL :(
--
Konstantin Andreev.