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Virtual hosts on Exadata with OVM are HVM and not PV. This is one of the limitations of Infiniband SR-IOV – can’t be used with PV. So there is a qemu used to emulate the hardware
This week I had a "pleasure" of reimaging Exadata server to use OVM. During this process we hit interesting problem – after the reimaging process there was no bridge at DOM0, corresponding to the client network
I’ve created recently a script in AWK to create wait event histogram from 10046 trace file. The script can be found here. I thought that a good idea would be creating a little script to analyze the contents of
Some time ago one of my students asked me if temp segments are being written to flash disks on Exadata… Well I wasn’t sure 🙂 But recently I had some time to check it. Let’s create some query that will generate
I’ve wrote about privilege escalation with external tables in this post: https://blog.ora-600.pl/2014/12/23/simple-technics-of-privilege-escalation-part2-dbasysdba/ This time we will try to list all files withi
Thanks to Oracle I had a possibility to test the new Sparc M7 with DAX coprocessors to boost In-Memory performance. You can read about it here and here My first thought was – how to check if and when the DAX co
Let’s imagine the following situation – you have a table called EMPLOYEES_TMP which is a global temporary table with a variable number of rows – totally nondeterministic. And there is a query which runs very of
At UKOUG Tech’15 (Super Sunday) there was a session called "12c: A Closer Look at the Multi-Process Multi-Threaded Model for Oracle on Linux/Unix" by Markus Flechtner. Since then I can’t stop thinking about the
Let’s check, why PRAGMA UDF makes execution faster, then regular function. C function responsible for calling a PL/SQL code from SQL is called "plsql_run":
I’ve already showed you, how to escalate privileges in Oracle Databases. https://blog.ora-600.pl/2013/04/02/privilege-escalation-in-oracle-11gr2-part1/ https://blog.ora-600.pl/2014/12/23/simple-technics-of-priv
I było tak, że 31 dnia miesiąca sierpnia roku 2015, spotkali się entuzjaści Wyroczni w posiadłości AVIVA. I było tak, że dzierżąc kufle – po brzegi browarem wypełnione – zasiadło wielu aby posłuchać kilku, któr
I’ve started the project called RICO – the tool, written in C++ for last resort data recovery. It can be used to extract data from corrupted datafiles and dump them in the form of text files. It is in the early