Oracle Database 12c Patching: DBMS_QOPATCH, OPATCH_XML_INV, and datapatch

Background Oracle Database 12c brings us many new features including: the long needed ability to run OPatch and query the patch software installed in the Oracle Home programatically through SQL using the new DBMS_QOPATCH package. If you’re a DBA working in an environment where patching consistently among databases is important, this is a welcomed enhancement….

Performance Problems with Dynamic Statistics in Oracle 12c

I’ve been making some tests recently with the new Oracle In-Memory option and have been faced with an unexpected  performance problem.  Here is a test case: Waiting for in-memory segment population: Now let’s make a simple two table join: Query runs pretty fast. Execution plan has the brand new vector transformation After having such…

Troubleshooting a Multipath Issue

Multipathing allows to configure multiple paths from servers to storage arrays. It provides I/O failover and load balancing. Linux uses device mapper kernel framework to support multipathing. In this post I will explain the steps taken to troubleshoot a multipath issue. This should provide an glimpse into the tools and technology involved. Problem was reported…

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