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wrong permission on shm kills JAVA_JIT
We found a lot of trace files from several DBs on one of our DB Servers.They look like:*********_ora_26444.trc or *********_m000_5598.trc*** 2017-09-08 15:11:29.181*** SESSION ID:(632.5995) 2017-09-08...
View Articledigging into mrskew internals
I'm spending some time working with Method-Rs trace file analyzer mrskew.As the requirements are beyond simple analyses (here an example about the uncommon things to do) I'm consulting the...
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Oracle Bundle Patches - release timing
I have to invest much of my time (at work) into Oracle and managing of patches, merge patches, patch requests and similar things.At this task I identified an interesting (but probably worthless)...
View Articleprelink makes instance unusable
I spent a recent night hunting an issue which was non trivial to detect.On a 4 node cluster 2 nodes got Linux patches and were rebooted. This was done after 10pm for minimal business impact. (The...
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Backup stalled due to ASM rebalance stuck
I hit an issue where a full backup took much longer than normal.In this case there was no alarm yet as no threshold was reached. But I worked on the DB for some other reason and out of a habit I most...
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I went to a conference - and all I can post about is this picture
I was on DOAG and UKOUG conferences this year and hold some presentations there.Of course I attended even more presentations and learned a lot of new things.But I did not blog about it for some good...
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manage ORACLE_HOMEs and patches in a centralised way
Managing many ORACLE_HOMEs in a complex environment can be tricky, especially when questions about their patches & bugs or comparisons should be done.It's required to understand the different types...
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oratop with TFA 12.2.1.3.0
We are facing an issue where Oracles Trace File Analyzer creates high load on some servers.During the discussion with Oracle Support I installed the latest version of TFA which is 12.2.1.3.0 right...
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don't look to close, it might change the results
We all know, if we try to look to close on some details, the results we get may change from the original observation.This is also sometimes true for Oracle Trace events:During analyses of a query with...
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Method R Profiler on x86_64 Linux with HiDPI
For a new installed Linux Laptop I tried to install Method RProfiler (and Tools).But it was not as smooth as expected.mrprop_wrapper failed with/opt/mrprof/mrprof_wrapper: line 45:...
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real virtual CPUs
Some software changes it's behavior based on capabilities of the system it's running on.but sometimes it's interesting to check how a software would heave on a different system, which is not at hand...
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Age - hard to calculate
The concept of age seems quite simple. Right now I'm 42 years old.I can be more precise and define it as 42 years, some months and several days.And at a given date I will be 43 years old, and months...
View Articlespfile parameters derived from cpu_count
In Oracle databases some spfile parameters are derived based on others, if they are not set explicit. One of the main drivers I discovered is CPU_COUNT.So I did some tests based in the past for version...
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more fun with ages
On-call duties sometimes leads to interesting results.I have to observe a restore running (or to be more precise wait for a tape library to find the right tapes and put them into drives.This gives me...
View ArticleTracing the Database Configuration Assistant
I am struggling with DBCA right now so a little tracing is advised.Note Tracing the Database Configuration Assistant (DBCA) (Doc ID 188134.1) gives a nice suggestion to add these...
View Articleenabling Database Vault is complicated
Enabling Database Vault in a already running system can be laborious.I recently tried to enable DV in a (copy of a ) production Oracle EBS DB.The Documentation is pretty lear and...
View Articleflipping performance
Recently I had a request to check "if there is any problem with the database at <specific times>".You can imagine, there was no problem. Nothing in alert.log, no tracefiles, no locks or oddities...
View Articlepreupgrade.jar version number
Mike Dietrich is very motivated to convince everyone who wants to take Oracle database upgrades serious to use always the latest version of preupgrade.jar. Some parts of Note:884522.1 - How to Download...
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when it runs on your computer ...
... please don't see it ready for customers.I try to enable Database Vault on an existing 12.2 database.A proper document to follow is How To Enable Database Vault in a 12c database ? (Doc ID...
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OUD - no operational route
Oracle Universal Directory is by far not my preferred tool.Probably it's me, I'm just not used to it.The latest joy was an error when I tried to runeusm addDatabaseand I...
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