November 2015 archive

Nov 30

cd: -M: invalid option

I’m trying to clean up trace files on one of my RAC testbeds. Oracle Corp was gracious enough to name the database “-MGMTDB” for me to give me a nice challenge (dripping with sarcasm). Here I am in my DIAGNOTIC_DEST and we can see two databases. [oracle@host01 trace]$ cd /u01/app/oracle/diag/rdbms [oracle@host01 rdbms]$ ls -l total …

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Nov 16

Dynamic Sampling Killing Me in 12c

Eleven days ago, I blogged about how Adaptive Dynamic Stats was consuming resources in my production RAC databases. After putting out that fire, I was on to examine some poorly performing queries being reported by our QA people in Test and other non-production databases. I did as any good Oracle DBA would do. I gathered …

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Nov 16

Lighty Purchasing Adventure

Those that follow me on Twitter and in this blog know that I really like Orachrome’s Lighty for performance tuning. I prefer this over Enterprise Manager. I’ve gotten to the point where I get depressed if Lighty isn’t available to me and I am forced to use EM in its place. Don’t get me wrong, …

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Nov 11

Addnode resolv.conf Failures

Today I was trying to add a new node to an existing Oracle RAC cluster. Grid Infrastructure is version 12.1.0.2 running on Oracle Linux 5.11. I ran through the usual Cluster Verification Utility (CVU) checks and all checks passed. To add the node, I issued the following command from the $GRID_HOME/addnode directory. ./addnode.sh -silent “CLUSTER_NEW_NODES={newnode}” “CLUSTER_NEW_VIRTUAL_HOSTNAMES={newnode-vip}” …

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Nov 05

Adaptive Dynamic Stats Kills Performance in 12.1.0.2 RAC

After a recent upgrade to 12.1.0.2, I’ve been working on a number of performance issues. Many such issues are related to poor SQL and a number of issues I’ve resolved I’ve proven were issues in the old 11.2.0.4 release. This just means it’s always been an issue. But people are taking the opportunity of the …

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