My team inherited an Oracle-based web application and they are fairly inexperienced with Oracle database servers.
The Oracle 10g server is running on a Windows 2003 Server with plenty of disk space and from time to time, all connectivity is lost, the application stops working, not even SQL Plus is able to connect to the database server.
But when we check the Windows Service manager, it says that the service is up and running. A restart usually fixes the problem, but we need to properly troubleshoot it so we know what's causing it and so we can avoid it to happen anymore.
Where should we start looking for clues? What are the criticial log files we should be investigating?
On the server you should have an environment variable called ORACLE_HOME which indicate the root of the Oracle install. Most likely the Oracle trace/dump folders will be under there. Search for a folder called "bdump" (background dump). That's where the main log file, knows as the alert log, will be, as well as trace files generated by background processes. There will be an adjacent file called "udump" which will contain any trace files generated by user processes.
However, my real advice is that you should either hire someone who knows Oracle or get Oracle Support involved.
The alert log would be the first file to check.
It will probably be in $ORACLE_HOME/admin/bdump and (probably) called alert_DATABASE-SID.log
It contains most of the important actions that the database does, as well as any important errors that occur.
I have to agree with cagcowboy. Check your alert logs for errors. If no errors then maintain a sysdba login into the database and when it hangs, attempt to do a hang analysis. See metalink note 215858.1 on hanganalyze.
Have you tried tnsping? We've occasionally run into problems with the listener that requires an assist from our DBA. tnsping is the diagnostic tool we use to do triage.
I would recommend hiring an experienced Oracle DBA if at all possible.
check the alert log to see how the Db is structured. sometimes badly set parameters make hangs or slow performance. or you can shutdown and start in mount mode, then check the v$parameter values for problems. setting total memory is very important.
Related
I am connecting to oracle 12 in Oracle cloud, from PowerBI Desktop windows server 2016.
Oracle client is installed and TNS file configured.
Oracle is hosted by a vendor so my only access is to directly query the database.
In powerBI, when using an oracle connection, i get ORA-03113 errors about 50% of the time when refreshing data. There is no discernible pattern to the appearance of the error.
If i connect via a System ODBC connection set up in windows, I dont get any issues or errors, although the data load is a bit slower.
I would appreciate ideas on what may be causing this issue or what to check to help get more information.
I'm afraid your issue needs some deeper analysis as ORA-03113 might have various reasons, but typically it means that the 'oracle' executable has terminated unexpectedly once there was an existing connection. You should try to isolate the SQL command that is executing when the error occurs. It can be done either by checking the trace files on the server or by using SQL*Net trace if you don't have access to the server. If a statement can be isolated which consistently raises the ORA-3113 error, then it can be further analysed (like execution plan, triggers, etc), or maybe the best to raise an SR so Oracle Support can work on the issue. If you have access to Oracle Support you can find more information about ORA-03113 troubleshooting in MOS Doc ID 1506805.1. Let me know if I can help you any further.
i have an error which is driving me crazy and i dont know how to deal with it. In a PC with windows 10 64-bit , i got an oracle database server 11g. Everytime the pc restarts or shuts down and then restarts i get the following error when i try to connect to the database :
ORA-01033: ORACLE initialization or shutdown in progress
Process ID: 0
Session ID: 0 Serial number: 0
the only way to get my database running is the following one:
open a cmd and type :
rman target /
recover database;
shutdown immediate;
startup mount;
alter database open resetlogs;
after that everything is fine , but if i restart the PC i get the same error again.
Has anyone dealted with anything like this before?
I have checked the hard disk and is ok, have defragmented it, have run test diagnostics, it is driving me crazy. Any idea would be welcome!
Thanx in advance!
That is a pretty general error. Your database can have issues with either starting up or maybe shuting down cleanly.
I would recommend you looking at the end of the alert.log file right after the server is started, before performing rman recovery.
You can find hints there as why the database did not started up to open state, where and why it is hanging, etc.
EDIT: So the error is ORA-00600 [dbkif_find_next_record_1]
Whenever an ORA-00600, or ORA-00700 or ORA-07445 occurs, this is an internal error within Oracle core. For this cases there is this neat tool at http://support.oracle.com which can search the knowledge base of Oracle MySupport network and try to find existing articles and/or patches, hotfixes for respective arguments of these internal errors.
The tool can be found as Oracle Support Doc ID 153788.1.
Unfortunatelly, the lookup tool did not found anything for argument ORA-00600 [dbkif_find_next_record_1]. In that case please make sure that your OS is updated and supported. Also if you are running on VM, that the VM has all parameters set according to Oracle's recommendations and if there is nothing suspicious there, you will have to open "Service request" at http://support.oracle.com
I am not an expertise in oracle DB. But I am curious to know that how can we check the logs of particular Stored procedure when it gets executed.
I check the trace folder but I dont know how and which file I have to analyse.
When I checked the UNIX logs it shows timeout error . It seems it did not get the response form one of the procedure. And after 2-3 hrs it get processed and sometimes it dosent. It should have done that job in 30 mnts max. I am not sure if DB is culprit or WEB SERVER (WAS) .
In extreme case I ask for DB restart and WAS restart and this solves our problem .
Is it possible to trace the problem? I am in PROD environment . The same is not behavior in UAT or in SIT environment
Could this be the problem from WAS or DB side? Please throw some light on this .
Thanks
I think what you want is DBMS_TRACE You'll have to enable tracing in your session and execute the procedure manually.
If by chance, this procedure is being executed by ORACLE scheduler you may find some info in alert log. I'd suggest checking that anyway.
If the procedure used to run in 30min and now takes 2h to complete and if there were no changes to it then the problem is not in the procedure.
I'd suggest you check for unusable indexes, redo log switches, blocking sessions, table locks etc. hard to say exactly without knowing the procedure. You say it's a prod environment. DBA must surely have some performance monitoring in place. If, by chance, you have Oracle Enterprise Manager go and take a look at what is happening while the procedure is being executed.
So I'm coming from a position as a SQL Server developer who has written a little bit of PL/SQL way back in the mists of time but effectively knows nothing.
I've got a laptop, it's running Oracle. There is a database on the laptop which I need to have a look at and neither I, nor anyone else I can speak to, knows what it's called.
I have a couple of logins including one which alleges to be an Admin login.
What's the easiest way to browse the databases on the server and then connect to one?
I suspect that my assumptions about relationships between servers, users and databases from SQL Server are leading me astray but right now I can't get past idea that the client tools Oracle ships are someone's idea of a joke but I'm really not finding it that funny.
I'm pretty sure that it's version 9.2 that's running.
Happy to provide more information but right now I don't know where to start.
If this is windows look in the services. Each database will have a separate service. By default these are named OracleServiceDATABASENAME.
You may be able to connect with just this information on the default port 1521.
If that does not work open the properties of that service you can find the location of the oracle home. The default place to keep your connection information in the ORACLEHOME\network\admin\tnsnames.ora . Using the database name you can find your connect information in this file.
If this is linux/unix look in the /etc/oratab file. This should have the database name and oracle home listed. The default location of the tnsnames.ora file is the same as on windows.
Once you have this information you can use any of the tools mentioned above to connect to the database.
I don't know what qualifies as "easiest" in your book. I'm moderately fond of Aqua Data Studio (www.aquafold.com); it's nice & visual & pretty & all. It's also Not Cheap, but might be worth a 2-week evaluation to see if it does anything helpful for you. I'm not an expert on this, and I joined an Oracle-based group from a SQL Server background; that's the tool they were using at the time, and I've found it extremely usable. But that's just me. Good luck.
Check out Oracle SQL Developer. (It's free)
I'm not a SQL Server expert, but there are differences in terminology.
An Oracle "Instance" is a single entity of the Oracle software. A database is the actual logical data that the instance serves. You may have multiple instances of the Oracle database software running against one database (This is considered a RAC setup); or just one instance running against one database.
I'm assuming what you mean by database here is actually the different schemas/users/tablespaces/procedures etc. that you have within an Oracle database. In that case, Oracle SQL Developer should do the job nicely.
If you are able to utilize Enterprise Manager (this is a licensed option), it provides this functionality as well, though it is more cumbersome than SQL Developer IMHO. EM does provide many other tools for providing a general overview of your Oracle instance health, alerts, and many things used to help tune the performance of your Oracle instance.
In Windows, the following command lists running database services:
net start | findstr -i ora
In Unix/Linux, grepping for the Oracle SMON process will give you the names of running databases:
ps -ef | grep smon
I have an Access application with a SQL server back-end, mixed with quite a few DB objects local to the Access app. I've tried running SQL Profiler, but I got very little except a cryptic sp_execute 2,4288,4289,4290,4291,4292,4293,4294,4295,4296,4297.
I would like a trace tool that is local to the Access DB, so I also pick up any activity that doesn't go back to the SQL server.
As far as I know there is no such facility within Access but, depending on your case, you could try these few things:
Write a wrapper against SQL executables: that would mean replacing all calls to Execute, OpenRecordset etc within your VBA to an alternative version that would log the query.
This isn't going to catch everything obviously but it could help.
Move your local tables to another database and use ODBC to relink them to your original Access application. You can then use ODBC's logging facilities.
This could be the best altenative as it's fairly easy to setup for debugging.
It's not the best solution for a production environment though as all your calls to local tables will in fact go through ODBC, but again, it's a temporary solution for debugging.
Use ShowPlan and ISAMStats to view how Jet/ACE interprets your queries and get other database activity stats.
It's easy to setup by writing a key to the registry and you'll end-up with a log describing how your queries are analysed.
It's more useful for optimisation than logging but again, it could help.
Use Flextracer, a shareware, free for 30 days or so. My colleague here has just found this for us as we were going through a similar situation. Problem solved.
http://www.geardownload.com/development/flextracer-download.html
[]s,
Pedro Carneiro Jr.
pedrokarneiro#hotmail.com