Hello,
I try to execute a simple program with maxdb connected with odbc.
1) DECLARE cursor1 for CURSOR SELECT ...
2) OPEN cursor1
3) FETCH cursor1 INTO ...
4) CLOSE cursor1
5) DECLARE cursor1 for CURSOR SELECT ...
It hangs with " -9206 AK DUPLICATE catalog information",
How can we use the same cursor name ?
Do we have to deallocate, or change an option in maxdb,
Thanks a lot for any help
Best regards
Dear Experts,
We are doing Maxdb upgrade 7.3 to 7.5 on HP PARISC 64 getting error -24894,ERR_KNLDIRTY backup history failed.
Please suggest.
Thanks,
Hi Joshi,
The error you getting is due to missing backup logs or backup logs are corrupted and hence it could not be read.
Refer to the solution in SAP Note 524132 - The backup history cannot be read
Hope this helps.
Regards,
Deepak Kori
Can you share your experience on system copy procedure of production database of sapdb 7.3 into Quality of content server with sapdb v.7.4software. in Aix -OS environemnt and used file system storage method.
The problem doesn't occur in MaxDB version Linux 64bits 7.8.02.35
It only occurs in MaxDB version Linux 64bits 7.8.02.37
How can i report the bug, so that it can be corrected in next MaxDb release ?
Thanks for answer
Hello!
We are getting low hit rate alerts for data cache mostly over the night.
During the normal operatin the data cache ratio is ok (98-99 %).
As consequence we get an alert regarding low data cache ration within weekly EarlyWatch Alert.
Are there a procedure to optimize the data cache ration over the night in order to improve the overall data cache ratio?
Our maxDB version is 7.8.02.034.
Thank you!
We have an instance of SAP DB database. We would like to ask you for help with migration from SAP to MAX DB, but the data from SAPDB instance must be saved. We have to export all data (structure and data) from current SAP DB instance and put this all to new instance of MAX DB.
Of course we tried to do it for two ways :
1. In MAX-DB STUDIO we have attached instance of SAP DB and instance of MAX DB. After this, right click on the SAP DB instance and tried to export but the error has appeared : export not possible , reason : version of source database not supported by loader plugin.
2. We have written dbm_cli script for recover data but the error has also appeared : The parameter UseMultiVersionReadSupport not found.
We have to backup SAP DB instance (structure and all data) and restore for MAX DB instance, or copy the instance some other way.
Have you got some solution or tips ?
Hi Alex,
It could be happening that during night time many jobs are running which require a better cache size value. Request you to monitor the requirement on cache and update cache_size parameter to fine tune the same.
Hope this helps.
Regards,
Deepak Kori
Hi Chandrasekhar,
The problem or requirement is not very clear. Please help to understand the following
1) You have PRD content server configured on MaxDB database with version 7.3 ?
2) You have QAS content server configured on MAxDB database with version 7.4 ?
3) What do you mean by used fulesystem storage method as posted in your query ?
in Aix -OS environemnt and used file system storage method.
4) You plan to refresh QAS MaxDB running on 7.4 with PRD MaxDB running on 7.3 ?
Regards,
Deepak Kori
Many thanks!
The cache ratio via EWA report is 96 % and catalog cache is 81 %
CacheMemorySize is setting to 1000000 and CAT_CACHE_SUPPLY is setting to 14000
Are there some rule of thumb how to set these parameters , e.g. based on RAM-size of server?
Additional question:
If I have 4 CPU on my Windows Server and I only have DB and SAP instance (no dialog instances) how can I set the parameter MaxCPUs?
Hi Alex,
You may use database analyzer as described in below SAP note
Note 1111426 - Parameter check for liveCache/MaxDB instances
This will help you to set recommendations as per SAP.
Regards,
Deepak Kori
Hi,
Please refer to the following links.
http://wiki.scn.sap.com/wiki/display/MaxDB/HowTo+-+Database+Migration+to+SAP+MaxDB
http://scn.sap.com/thread/3261128
Kind Regards,
Johan
I think Yes... its only 1 page form and 5-6 filed, so should not take more than 5 mins to complete.
MaxDB Software Download Area now via SAP Store & new Software available soon
Hi Alex,
Also view the following note on cache recommendations:
1308217 - SAP MaxDB Version 7.8: Parameter recommendations
Also could be helpful to review 819641 - FAQ: SAP MaxDB Performance.
If you also refer to this link training link with slideshow they have specifics on this to my understanding.
http://maxdb.sap.com/training/expert_sessions/Perf_Optimization_SAP_MaxDB.pdf
Kind Regards,
Johan
Hello!
Can some one help to get the DBANALYZER running?
If I try to run the command, I get the following error:
E:\sapdb\ARS\db\bin>dbanalyzer.exe -d ARS -u superdba,password -f dbanalyzer_InstanceParameterCheck.cfg -o c:\param_check -i -c 1 -t 1,1 -n SAPTEST
MaxDB Database Analyzer, The Performance Analysis Tool, Version 7.8.02.34
Copyright 2000-2013 by SAP AG
ERROR 2: Invalid/incomplete program arguments.
Unknown option!
I checked the password of superdba via DMBCLI, it should be right.
Hi.
Thank you for your reply.
I can not find the answer for my question here, this is concerning others engines version.
We have SAP 7.4 and MAX 7.8 and we need to make a backup (I done it already) and we need to recover this backup into database instance on the MAX 7.8.
I have made a backup follow instruction...
dbmcli -d ECONTROL -u DBA,DBA medium_put completeF c:\data\backup\sap_econtrol.bck FILE DATA 0 8 YES
dbmcli -d ECONTROL -u DBA,DBA -uUTL -c backup_start completeF
...and then the file has been created.
Question is , how can I recover it into MaxDB instance.
Of course I tried to do it manually (in Windows command line I have wrote):
dbmcli -d ECONTROL -u DBA,DBA medium_put completeF c:\data\backup\sap_econtrol.bck FILE DATA 0 8 YES
dbmcli -d ECONTROL -u DBA,DBA -c db_cold
dbmcli -d ECONTROL -u DBA,DBA -uUTL -c util_execute clear log
dbmcli -d ECONTROL -u DBA,DBA recover_start completeF
dbmcli -d ECONTROL -u DBA,DBA -c db_warm
dbmcli -d ECONTROL -u DBA,DBA -c load_systab -u DBA,DBA -ud DBA
But the error appeared :
-3068 mismatch of parameter configuration between backup and instance,
6 Data recovery failed.
20035, Parameter UseMultiVersionReadSupport not found
The time for us is critical, we need to get the solution as soon as possible.
We will be very thankfull for your support.
Kind Regards,
Adam
Hi,
Adam please refer to the following link where Juan Reyes gave good answer.
http://scn.sap.com/thread/3261128
You will need to first take SAP DB 7.4 to 7.5 and only then can you go to MaxDB 7.8
Regards,
Johan
Hello Alex,
It looks like you did the parameter check correctly. Are you sure that the files are located in your current directory and that you can write into the -o directory.
But notice the parameter check does not give any recommendation related to the Parameter Cache_Size.
If you get worse cache hitrate during batch processing in the night, it really sounds that there are missing indexes for the batch jobs. So the system has to read much more data to get the qualified records. I would first check the ressource monitor - Do you get information about long running SQL.
Additionally you can use transaction ST06/st03 to get the most expensive batch jobs.
And of course you can start Command monitor during night - but please don't forget to stop it in the morning, Otherwise it overwrites you logged commands.
Please check as well the Expert Sesion about the performance monitoring tools:
http://maxdb.sap.com/training/
Regards, Christiane
Hello!
many thanks!
If I have 4 CPU on my Windows Server and I only have DB and SAP instance (no dialog instances) can I set the parameter MaxCPUs to 4 to use all CPU?
HI,
Not sure of the sap standard but look at link.
http://www.datadisk.co.uk/html_docs/maxdb/overview.htm
They have basic formula on page if you are running on sap.
Refer also to
http://maxdb.sap.com/training/internals_7.6/kernel_parameters_EN_76.pdf
Another thing I tend to notice if you set value to 1 you have collisions and problems also refer to link.
http://scn.sap.com/thread/1813598
Regards,
Johan