How do I estimate the size of the Image Copy Dataset?

Pantazis Pantazi

How do I estimate the size of the Image Copy Dataset?
According to the manual ..... (Utility Guide - Page 94)

"To find the approximate size of the image copy dataset for a tablespace,
in bytes,
you can execute COPY with CHANGELIMIT REPORTONLY option, or use the
following
procedure:

1. Find the high allocated page number, either from the NACTIVE column of
SYSIBM.SYSTABLESPACE after running RUNSTATS utility, or from
information
in the VSAM Catalog data set.

2. Multiply the high allocated page number by the page size."

I tried to find the size using the VSAM Catalog data set, since the
statistics run only
once a week but Image copies I take every night. I came across a puzzle,
however,
when I tried to calculate the values.

How do I estimate the "high allocated page number" from information in the
VSAM Catalog Dataset?

Thanks

---------------------------------------------------------------------------------
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Pantazis Pantazi

Re: How do I estimate the size of the Image Copy Dataset?
(in response to Robert Lawrence)
I tried to do that and I did HI-U-RBA / 1024bytes / 48KB = TRK but the
number I got was very different from the actual size of the IC dataset.

The number of the above formula was 30TRK but the actual image copy
output was only 1TRK.

I can not use any of the DB2 statistics because I do not run RUNSTATS or
STOSPACE daily
but I do take ICs daily and the sizes of the tablespaces might change
dramatically without the
DB2 statistics being aware.

If I could only find what the manual means by "Find the high allocated page
number"......

Thanks



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Don't bother. Simply use the HI-U-RBA. The IC size may be slightly less
because the last allocation unit may be only partially filled with data
pages. This makes a difference if you have many small Tablespaces with CYL
allocation - they may require only 1 (or few) TRKs of IC.
Also check the STOSPACE Utility; it is much less costly than RUNSTATS and
should update the columns you need - look it up in the manuals.

Dr. Michael Ebert
DB2 Database Administrator
aMaDEUS Data Processing
Erding / Munich, Germany




From: [login to unmask email]@IDUGDB2-L.ORG on 13-12-2004 17:18 GMT

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Subjec How do I estimate the size of the
t: Image Copy Dataset?








According to the manual ..... (Utility Guide - Page 94)

"To find the approximate size of the image copy dataset for a tablespace,
in bytes,
you can execute COPY with CHANGELIMIT REPORTONLY option, or use the
following
procedure:

1. Find the high allocated page number, either from the NACTIVE column of
SYSIBM.SYSTABLESPACE after running RUNSTATS utility, or from information
in the VSAM Catalog data set.

2. Multiply the high allocated page number by the page size."

I tried to find the size using the VSAM Catalog data set, since the
statistics run only
once a week but Image copies I take every night. I came across a puzzle,
however,
when I tried to calculate the values.

How do I estimate the "high allocated page number" from information in the
VSAM Catalog Dataset?

Thanks

---------------------------------------------------------------------------------

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page at http://www.idugdb2-l.org/archives/db2-l.html. From that page select
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Pantazis Pantazi

Re: How do I estimate the size of the Image Copy Dataset?
(in response to Pantazis Pantazi)
These are the fiqures I have for one specific TS part

CISIZE--------------4096
HI-A-RBA-------236666880
HI-U-RBA---------1474560

1474560 / 4096 = 360 4kpages

236666880 / 4096 = 57780 4kpages

Please note that the actual partition only contains 13 records and when
running
the image copy, it says that it processes 3 pages only.

That is what I can not fiqure out...



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| | rlawrence |
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hi-a-rba/ci-size assuming ci-size is 4096 this will give the number of 4k
pages that are used. however the hi-a-rba will be the approximate number of
bytes used for the dataset .
HTH


Bob Lawrence
DBA
Boscov's Dept Stores LLc



-----Original Message-----
From: DB2 Data Base Discussion List [mailto:[login to unmask email]On Behalf
Of [login to unmask email]
Sent: Monday, December 13, 2004 12:18 PM
To: [login to unmask email]
Subject: How do I estimate the size of the Image Copy Dataset?



According to the manual ..... (Utility Guide - Page 94)

"To find the approximate size of the image copy dataset for a tablespace,
in bytes,
you can execute COPY with CHANGELIMIT REPORTONLY option, or use the
following
procedure:

1. Find the high allocated page number, either from the NACTIVE column of
SYSIBM.SYSTABLESPACE after running RUNSTATS utility, or from information
in the VSAM Catalog data set.

2. Multiply the high allocated page number by the page size."

I tried to find the size using the VSAM Catalog data set, since the
statistics run only
once a week but Image copies I take every night. I came across a puzzle,
however,
when I tried to calculate the values.

How do I estimate the "high allocated page number" from information in the
VSAM Catalog Dataset?

Thanks
---------------------------------------------------------------------------------
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Pantazis Pantazi

Re: How do I estimate the size of the Image Copy Dataset?
(in response to Chris Blaicher)
I just wanted to see if there was any way to find out the exact fiqure for
the IC output since
from my test run I had such a big difference.

Of course there is the issue you mentioned, CYL allocation and small
datasets. What I am trying
to do is to built a process that would build image copy jobs for the R/3
systems.

I have already implemented a logic similar to yours but I was under the
impression that there would be
some other logic that would bring the output estimation closer to the real
value. I guess not....

Thanks again



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Well that's what I said. I'm not sure what the unit of formatting is when
DB2 needs more space - it's not the allocation unit (I've just looked at a
TS where the HI-U-RBA is at 283.41666... TRKs). If you want to know how
many pages there are, then there are probably ways outside of RUNSTATS and
STOSPACE to find out, but they're not worth the bother. And why can't you
run STOSPACE every day?

What is it you're trying to accomplish anyway? I use this strategy: if the
calculated value (from HI-U-RBA, converted to kB) is less than 5 CYL, I
allocate in TRKs, otherwise in CYLs. I use the RLSE subparameter to free
unused space.

I've not looked at the V7 TEMPLATE functionality for dynamic IC dataset
allocation so I don't know whether you can do this CYL/TRK distinction
there. But it uses HI-U-RBA as well.

Dr. Michael Ebert
DB2 Database Administrator
aMaDEUS Data Processing
Erding / Munich, Germany




From: [login to unmask email]@IDUGDB2-L.ORG on 13-12-2004 17:38 GMT

Please respond to DB2 Database Discussion list at IDUG
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Sent by: DB2 Data Base Discussion List <[login to unmask email]>



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cc:






Subjec Re: How do I estimate the size of
t: the Image Copy Dataset?








I tried to do that and I did HI-U-RBA / 1024bytes / 48KB = TRK but the
number I got was very different from the actual size of the IC dataset.

The number of the above formula was 30TRK but the actual image copy
output was only 1TRK.

I can not use any of the DB2 statistics because I do not run RUNSTATS or
STOSPACE daily
but I do take ICs daily and the sizes of the tablespaces might change
dramatically without the
DB2 statistics being aware.

If I could only find what the manual means by "Find the high allocated page
number"......

Thanks

Michael Ebert <[login to unmask email]>



Michael Ebert
<[login to unmask email] To:
ET> [login to unmask email]
Sent by: DB2 Data cc:
Base Discussion bcc:
List Subject: Re: How do I
<[login to unmask email] estimate the size of the
ORG> Image Copy Dataset?


13/12/2004 05:27
ìì
Please respond to
DB2 Database
Discussion list
at IDUG





Don't bother. Simply use the HI-U-RBA. The IC size may be slightly less
because the last allocation unit may be only partially filled with data
pages. This makes a difference if you have many small Tablespaces with CYL
allocation - they may require only 1 (or few) TRKs of IC.
Also check the STOSPACE Utility; it is much less costly than RUNSTATS and
should update the columns you need - look it up in the manuals.

Dr. Michael Ebert
DB2 Database Administrator
aMaDEUS Data Processing
Erding / Munich, Germany

Michael Ebert

Re: How do I estimate the size of the Image Copy Dataset?
(in response to Pantazis Pantazi)
Don't bother. Simply use the HI-U-RBA. The IC size may be slightly less
because the last allocation unit may be only partially filled with data
pages. This makes a difference if you have many small Tablespaces with CYL
allocation - they may require only 1 (or few) TRKs of IC.
Also check the STOSPACE Utility; it is much less costly than RUNSTATS and
should update the columns you need - look it up in the manuals.

Dr. Michael Ebert
DB2 Database Administrator
aMaDEUS Data Processing
Erding / Munich, Germany




From: [login to unmask email]@IDUGDB2-L.ORG on 13-12-2004 17:18 GMT

Please respond to DB2 Database Discussion list at IDUG
<[login to unmask email]>

Sent by: DB2 Data Base Discussion List <[login to unmask email]>



To: [login to unmask email]


cc:






Subjec How do I estimate the size of the
t: Image Copy Dataset?








According to the manual ..... (Utility Guide - Page 94)

"To find the approximate size of the image copy dataset for a tablespace,
in bytes,
you can execute COPY with CHANGELIMIT REPORTONLY option, or use the
following
procedure:

1. Find the high allocated page number, either from the NACTIVE column of
SYSIBM.SYSTABLESPACE after running RUNSTATS utility, or from information
in the VSAM Catalog data set.

2. Multiply the high allocated page number by the page size."

I tried to find the size using the VSAM Catalog data set, since the
statistics run only
once a week but Image copies I take every night. I came across a puzzle,
however,
when I tried to calculate the values.

How do I estimate the "high allocated page number" from information in the
VSAM Catalog Dataset?

Thanks

---------------------------------------------------------------------------------
Welcome to the IDUG DB2-L list. To unsubscribe, go to the archives and home page at http://www.idugdb2-l.org/archives/db2-l.html. From that page select "Join or Leave the list". The IDUG DB2-L FAQ is at http://www.idugdb2-l.org. The IDUG List Admins can be reached at [login to unmask email] Find out the latest on IDUG conferences at http://conferences.idug.org/index.cfm

Robert Lawrence

Re: How do I estimate the size of the Image Copy Dataset?
(in response to Michael Ebert)
hi-a-rba/ci-size assuming ci-size is 4096 this will give the number of 4k
pages that are used. however the hi-a-rba will be the approximate number of
bytes used for the dataset .
HTH
Bob Lawrence
DBA
Boscov's Dept Stores LLc


-----Original Message-----
From: DB2 Data Base Discussion List [mailto:[login to unmask email]On Behalf
Of [login to unmask email]
Sent: Monday, December 13, 2004 12:18 PM
To: [login to unmask email]
Subject: How do I estimate the size of the Image Copy Dataset?


According to the manual ..... (Utility Guide - Page 94)

"To find the approximate size of the image copy dataset for a tablespace,
in bytes,
you can execute COPY with CHANGELIMIT REPORTONLY option, or use the
following
procedure:

1. Find the high allocated page number, either from the NACTIVE column of
SYSIBM.SYSTABLESPACE after running RUNSTATS utility, or from information
in the VSAM Catalog data set.

2. Multiply the high allocated page number by the page size."

I tried to find the size using the VSAM Catalog data set, since the
statistics run only
once a week but Image copies I take every night. I came across a puzzle,
however,
when I tried to calculate the values.

How do I estimate the "high allocated page number" from information in the
VSAM Catalog Dataset?



Thanks ---------------------------------------------------------------------
------------ Welcome to the IDUG DB2-L list. To unsubscribe, go to the
archives and home page at http://www.idugdb2-l.org/archives/db2-l.html. From
that page select "Join or Leave the list". The IDUG DB2-L FAQ is at
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Michael Ebert

Re: How do I estimate the size of the Image Copy Dataset?
(in response to Pantazis Pantazi)
Well that's what I said. I'm not sure what the unit of formatting is when
DB2 needs more space - it's not the allocation unit (I've just looked at a
TS where the HI-U-RBA is at 283.41666... TRKs). If you want to know how
many pages there are, then there are probably ways outside of RUNSTATS and
STOSPACE to find out, but they're not worth the bother. And why can't you
run STOSPACE every day?

What is it you're trying to accomplish anyway? I use this strategy: if the
calculated value (from HI-U-RBA, converted to kB) is less than 5 CYL, I
allocate in TRKs, otherwise in CYLs. I use the RLSE subparameter to free
unused space.

I've not looked at the V7 TEMPLATE functionality for dynamic IC dataset
allocation so I don't know whether you can do this CYL/TRK distinction
there. But it uses HI-U-RBA as well.

Dr. Michael Ebert
DB2 Database Administrator
aMaDEUS Data Processing
Erding / Munich, Germany




From: [login to unmask email]@IDUGDB2-L.ORG on 13-12-2004 17:38 GMT

Please respond to DB2 Database Discussion list at IDUG
<[login to unmask email]>

Sent by: DB2 Data Base Discussion List <[login to unmask email]>



To: [login to unmask email]


cc:






Subjec Re: How do I estimate the size of
t: the Image Copy Dataset?








I tried to do that and I did HI-U-RBA / 1024bytes / 48KB = TRK but the
number I got was very different from the actual size of the IC dataset.

The number of the above formula was 30TRK but the actual image copy
output was only 1TRK.

I can not use any of the DB2 statistics because I do not run RUNSTATS or
STOSPACE daily
but I do take ICs daily and the sizes of the tablespaces might change
dramatically without the
DB2 statistics being aware.

If I could only find what the manual means by "Find the high allocated page
number"......

Thanks

Michael Ebert <[login to unmask email]>



Michael Ebert
<[login to unmask email] To:
ET> [login to unmask email]
Sent by: DB2 Data cc:
Base Discussion bcc:
List Subject: Re: How do I
<[login to unmask email] estimate the size of the
ORG> Image Copy Dataset?


13/12/2004 05:27
ìì
Please respond to
DB2 Database
Discussion list
at IDUG





Don't bother. Simply use the HI-U-RBA. The IC size may be slightly less
because the last allocation unit may be only partially filled with data
pages. This makes a difference if you have many small Tablespaces with CYL
allocation - they may require only 1 (or few) TRKs of IC.
Also check the STOSPACE Utility; it is much less costly than RUNSTATS and
should update the columns you need - look it up in the manuals.

Dr. Michael Ebert
DB2 Database Administrator
aMaDEUS Data Processing
Erding / Munich, Germany

Chris Blaicher

Re: How do I estimate the size of the Image Copy Dataset?
(in response to Michael Ebert)
It sounds like the table was created or loaded with the pre-format option
and was formatted out to a cylinder boundary. 12 blocks per track times 15
tracks times 2 cylinders. Look at how it was created or loaded.



Chris



_____

From: [login to unmask email] [mailto:[login to unmask email]
Sent: Monday, December 13, 2004 11:47 AM
To: [login to unmask email]
Subject: Re: How do I estimate the size of the Image Copy Dataset?



These are the fiqures I have for one specific TS part

CISIZE--------------4096
HI-A-RBA-------236666880
HI-U-RBA---------1474560

1474560 / 4096 = 360 4kpages

236666880 / 4096 = 57780 4kpages

Please note that the actual partition only contains 13 records and when
running
the image copy, it says that it processes 3 pages only.

That is what I can not fiqure out...

Inactive hide details for Robert Lawrence <[login to unmask email]>Robert
Lawrence <[login to unmask email]>




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Michael Ebert

Re: How do I estimate the size of the Image Copy Dataset?
(in response to Pantazis Pantazi)
No, it is not that simple. If you create an empty TS/table with PRIQTY 48,
it will use the full track. If you use PRIQTY 720, it will use the full
cylinder. We've got some empty partitioned TSs with PRIQTY 1440, after a
LOAD REPLACE or REORG the partitions use the full 2 CYLs. It also depends
on SEGSIZE. An empty SEGSIZE 64 TS will occupy 7 Tracks even if only 3
pages are used by DB2 - the rest are Zero pages.

If asked about the "SEGSIZE oddity" some time ago here, but never got an
explanation. In any case there is no pattern that is obvious to me.

Dr. Michael Ebert
DB2 Database Administrator
aMaDEUS Data Processing
Erding / Munich, Germany





From: "Blaicher, Chris" <[login to unmask email]>@IDUGDB2-L.ORG on
13-12-2004 10:01 CST

Please respond to DB2 Database Discussion list at IDUG
<[login to unmask email]>

Sent by: DB2 Data Base Discussion List <[login to unmask email]>



To: [login to unmask email]


cc:






Subjec Re: How do I estimate the size of
t: the Image Copy Dataset?








It sounds like the table was created or loaded with the pre-format option
and was formatted out to a cylinder boundary. 12 blocks per track times 15
tracks times 2 cylinders. Look at how it was created or loaded.

Chris

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Robert Lawrence

Re: How do I estimate the size of the Image Copy Dataset?
(in response to Michael Ebert)
I meant to say h-u-rba. However in my experience that is always rounded up
to the nearest controlareasize. It may be that DB2 starts by formatting the
first 2 controlareas. DB2 only copies those pages that are marked as having
data in its space map. Any pages that do not have data will not be copied. I
am not sure about pages that had data and then all of the data were deleted.
Thus any pages past the last page that contains data are not copied as you
experienced.

Bob Lawrence
DBA
Boscov's Dept Stores LLc


-----Original Message-----
From: DB2 Data Base Discussion List [mailto:[login to unmask email]On Behalf
Of [login to unmask email]
Sent: Monday, December 13, 2004 12:47 PM
To: [login to unmask email]
Subject: Re: How do I estimate the size of the Image Copy Dataset?


These are the fiqures I have for one specific TS part

CISIZE--------------4096
HI-A-RBA-------236666880
HI-U-RBA---------1474560

1474560 / 4096 = 360 4kpages

236666880 / 4096 = 57780 4kpages

Please note that the actual partition only contains 13 records and when
running
the image copy, it says that it processes 3 pages only.

That is what I can not fiqure out...

Robert Lawrence <[login to unmask email]>





Robert Lawrence <[login to unmask email]>
Sent by: DB2 Data Base Discussion List <[login to unmask email]>
13/12/2004 05:29 ìì
Please respond to rlawrence


To: [login to unmask email]
cc:
bcc:
Subject: Re: How do I estimate the size of the Image Copy Dataset?


hi-a-rba/ci-size assuming ci-size is 4096 this will give the number of 4k
pages that are used. however the hi-a-rba will be the approximate number of
bytes used for the dataset .
HTH

Bob Lawrence
DBA
Boscov's Dept Stores LLc


-----Original Message-----
From: DB2 Data Base Discussion List [mailto:[login to unmask email]On Behalf
Of [login to unmask email]
Sent: Monday, December 13, 2004 12:18 PM
To: [login to unmask email]
Subject: How do I estimate the size of the Image Copy Dataset?


According to the manual ..... (Utility Guide - Page 94)

"To find the approximate size of the image copy dataset for a tablespace,
in bytes,
you can execute COPY with CHANGELIMIT REPORTONLY option, or use the
following
procedure:

1. Find the high allocated page number, either from the NACTIVE column of
SYSIBM.SYSTABLESPACE after running RUNSTATS utility, or from information
in the VSAM Catalog data set.

2. Multiply the high allocated page number by the page size."

I tried to find the size using the VSAM Catalog data set, since the
statistics run only
once a week but Image copies I take every night. I came across a puzzle,
however,
when I tried to calculate the values.

How do I estimate the "high allocated page number" from information in the
VSAM Catalog Dataset?



Thanks ---------------------------------------------------------------------
------------ Welcome to the IDUG DB2-L list. To unsubscribe, go to the
archives and home page at http://www.idugdb2-l.org/archives/db2-l.html. From
that page select "Join or Leave the list". The IDUG DB2-L FAQ is at
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