Dear Iqbal,
I hope you are using ASE on windows machine.
Two possibilities for the error.
1.) Perhaps your F drive has no space left for the dump files to get stored.
2.) Or there is permission issue for the sybase user to take F drive.
The backups should be happening in F drive in a folder called backups as per your logs states.
Regards,
Ajith Prabhakaran
Hi,
the ASE log file can be found here:
Linux: /sybase/<SID>/ASE-15_0/install
Windows: ..... sybase\<SID>\ASE-15_0\install
The log file for ASE is called <SID>.log and for Backup Server <SID>_BS.log.
Anyhow the error message looks like a file system problem; e.g. permissions (does "ASE" have permissions to write into that directory), file system was busy, ....
Best regards,
Juergen
Hi all,
Just to complete my remark, after reading the document 'Performance and Tuning Series: Improving Performance with Statistical Analysis' (doc ID DC00976-01-1570-01) I notice the following information on page 29:
Statistics for column group: "pub_id", "type"
Last update of column statistics: Apr 8 2008 9:22:40:963AM
Range cell density: 0.0000000362887320
Total density: 0.0000000362887320
Range selectivity: default used (0.33)
In between selectivity: default used (0.25)
Unique range values: 0.0000000160149449
Unique total values: 0.0000000160149449
Average column width: default used (8.00)
Statistics for column group: "pub_id", "type", "pubdate"
Last update of column statistics: Apr 8 2008 9:22:40:963AM
Range cell density: 0.0000000358937986
Total density: 0.0000000358937986
Range selectivity: default used (0.33)
In between selectivity: default used (0.25)
Unique range values: 0.0000000158004305
Unique total values: 0.0000000158004305
Average column width: 2.0000000000000000
With 5000 rows in the table, the increasing precision of the optimizer’s
estimates of rows to be returned depends on the number of search arguments
used in the query:
• An equality search argument on only pub_id results in the estimate that
0.0335391029690461 * 5000 rows, or 168 rows, will be returned.
• Equality search arguments for all three columns result in the estimate that
0.0002011791956201 * 5000 rows, or only 1 row, will be returned.
I'm wondering where both values 0.0335391029690461 and 0.0002011791956201 come from?
let's assume the optimizer knows the number of rows to be returned (statistics up-to-date), how can I check using a index is cheaper than a tablescan? what's the formulae I could use to compute the costs for each access as an exercise to better understand the mechanism.
Last, are there any traceflags that will help me understanding how the optimized is picking a plan?
Thanks
Simon
Hi Simon,
There is simply too much to cover here in order for a good understanding looking at your starting point. It requires a base knowledge of statistics and histogramming as well as experience at actually debugging query processing on ASE.
My advice is to start running some queries ( with statement cache off) using set option show_lio_costing on and set statistics plancost. There is no clear documentation that will explain everything you see but the only way to understand it is to work with it day in and day out.
Once you start to make sense of the individual lio costing ( you'll need to look at optdiag output to) you can expand up to set option show_search_engine for join evaluation then finally set option show long for a deep dive. If you want to go further you then have to start looking at show_histograms and so it goes on.
Start simple and look at single search predicate queries and expand up. Create a table, put a row in it, create an index, add another row different values, update stats, and so on and so on. Look at the data available at each iteration.
There is plenty of unofficial documentation around if you look for it ( even on this site).
The figures you mention are histogram frequency cells ( see optdiag), holding essentially a weight which is a proportion of a domain which matches a given value.
Cheers,
Simon
Hi Anon,
Sometimes due to spinlocks there could be high cpu usage. Refer to link below on analyzing such situation and fixing it.
https://wiki.scn.sap.com/wiki/display/SYBASE/Spinlocks+and+CPU+usage+in+SAP+ASE
Regards,
Deepak Kori
But does the value "max online engines" define, how many cpus can be used?
Because at the moment this value is much higher than CPUs are available...
Thank you for replying Janos. I will try to write scripts at OS level.
Regards
Sridhar
Hi experts,
I want to schedule database dump.
In summary tab, when I click execute, it will loading until TIME_OUT error occur.
https://drive.google.com/folderview?id=0B62cNgHiqy9Ia2E3U0tIeGQ5RHc&usp=sharing
Please help.
Thank you.
Regards,
Fadzly Iqbal
Dear Ajith,
Thank you.
F drive has no space left for the dump files to get stored
Regards,
Fadzly Iqbal
The messages says 'enforce dump tran sequence' cannot be set as eithger
- database needs a dump
- an an logged operation was performed
- or log was truncated
All three conditions must match.
Did someone run 'DUMP TRANSACTION <DBNAME> WITH TUNRCATE_ONLY' - to clear up the log ?
was an unlogged operation performed (e.g. SELECT INTO command was run manually)
With kind regards
Tilman Model-Bosch
in ASE 15.7 ,how to avoild the long running backup job.
now 900000Mb and we are taking it on 3 stipes. it is taking alomost 5 hours
how to avoid this.
Typical issues related to slow database dumps (and loads):
- dumping/loading over a slow network
- slow database and/or dump devices (including contention on said devices)
- cpu contention
Take a look at these threads for more details on the above:
Dump database - performance tuning | SCN
Dear Mr Steinhäuaser
ABAP OPEN SQL remains unchanged . If you adhere to ABAP best practice programming then nothing changes with DB upgrade.
Generally : Existing code should continue to work .
HTH
Tilman Model-Bosch
Hi Gopi,
check whether your SAP system instance profile has below parameters updated
rdisp/bufrefmode = sendoff, exeauto
rdisp/bufreftime = (in seconds, time between two synchronization)
If not please set up and take SAP application restart.
Regards,
Deepak Kori
Hello,
I want to list the sizes of all tables (at least top 1000), data size and index size in seperate columns,
On DBACOCKPIT I can only display Top 500 and cannot display data and index size on the same list.
Index sizes come with single table analysis.
Is there an SQL statement that I can run on SQL Command line for this list?
Can you help, please?
Regards,
Yuksel AKCINAR
Dear Mr Kumar
isql is a 32 bit executabl vs isql64 is a 64 bit executable.
you may check using the OS command 'file'
What is your Linux Distribution and Version ?
Recently some distributors have started to omit installation of 32 bit runtime libraries so 32 bit executables wont work anymore.
There is a change request open for ASE to make isql and other 32 bit tools to be delivered as 64 bit tools if ASE is a 64 bit version
Rgds
Tilman Model-Bosch
Hi Tilman,
we use command 'file' but it shows like this,
how to check properly?
Regards,
Dinesh Kumar S.
SAP BASIS
Hello,
I'm new on sybase.
I'm trying to run a dbcc in my DB but is throws the following error:
1> dbcc checkdb ACNETDB_PRO, skip_ncindex
2> go
Msg 102, Level 15, State 1:
Server 'xxxxxxxxx', Line 1:
Incorrect syntax near 'ACNETDB_PRO'.
1>
Hi Yuksel,
I guess you may need to remove the restriction value 500 and execute the report from dbacockpit again to get full list of tables and indexes.
Regards,
Deepak Kori
You can connect using isql and manually run the below command :
1> use database_name
2> go
1> sp_spaceused
2> go
Hope this will be helpful
~Gaurav