Category Archives: Uncategorized

I dug up a simple C program that I wrote years ago to test disk performance.  I hesitated to publish it because it is rough and limited in scope and other more capable tools exist. But, I have made good … Continue reading →

In my previous post I described how I could not explain why I got better db file parallel read wait times in a test on Linux than I got running the same test on HP-UX.  I have discovered that the Linux … Continue reading →

I am still working on comparing performance between an HP-UX blade and a Linux virtual machine and I have a strange result.  I tried to come up with a simple example that would do a lot of single block I/O. … Continue reading →

I’m trying to compare two types of database servers and it looks like one has a faster CPU than the other.  But, the benchmark I have used runs a complicated variety of SQL so it is hard to really pin … Continue reading →

I need to change a view and an index on an active production system.  I’m concerned that the change will fail with a “ORA-00054: resource busy” error because I’m changing things that are in use.  I engaged in a twitter … Continue reading →

I’m trying to compare how a query runs on two different 11.2.0.3 systems.  One runs on HP-UX Itanium and one runs on 64 bit x86 Linux.  Same query, same plan, different hash value. HP-UX: SQL_ID 0kkhhb2w93cx0 ——————– update seg$ set type#=:4,blocks=:5,extents=:6,minexts=:7,maxexts=:8,exts … Continue reading →

I started using sar -d to look at disk performance on a Linux system this week and had to look up what some of the returned numbers meant.  I’ve used sar -d on HP Unix but the format is different. … Continue reading →

I was preparing for my weekend patch of our Exadata system and I needed to back up all of our Oracle homes and inventories on our production system.  On our 2 node dev and qa clusters I just ran the backups … Continue reading →

I saw a load of 44 on a node of our production Exadata and it worried me.  The AWR report looks like this: Host CPU Load Average CPUs Begin End %User %System %WIO %Idle —– ——— ——— ——— ——— ——— … Continue reading →

I just found out that this meeting was cancelled.  We will have to catch the next one. 🙂 – 3/16/2015 Sign up for the Arizona Oracle User Group (AZORA) meeting next week: signup url The email that I received from … Continue reading →