Agents in Clojure are functions that are applied “in the background” — a thread. Any function in Clojure implements java.lang.Runnable. To see what happens when an agent calls another agent, I set up two agents agt1 and agt2, their state is just an integer: rbemac2...

Die Jugend von heute liebt Luxus, hat schlechte Manieren und verachtet Autorität. Sie widersprechen ihren Eltern, legen die Beine übereinander und tyrannisieren ihre Lehrer. Sokrates, 470 v.Chr.

I wrote a module for String distance metrics two years ago in Haskell. You find this code at github.com. The module defines two global helper functions, intListToInt to convert a list of integers into a number, e.g. [1, 2, 3, 4] to 1234: and commonPrefix to determine...

Finding There seems to be a problem with access to Openfiler. An entry in /etc/initiators.deny is generated automatically denying the access from ALL to every iSCSI target configured: [root@localhost ~]# cat /etc/initiators.deny # PLEASE DO NOT MODIFY THIS CONFIGURATION...

I discovered a failed disk in a Linux software RAID array on a customer’s server. After the failed disk /dev/sdb was replaced I rebuilt the RAID by duplicating the partition layout of the remaining disk /dev/sda. At first I removed the partitions of the failed disk from...

Oracle provides lots of images for its VM Oracle VirtualBox. You have the choice of packages for many operating environments and pre-built appliances for development. See OTN page for VirtualBox downloads.

Starting with Oracle 11g there’s a new way to test I/O subsystems. The procedure DBMS_RESOURCE_MANAGER.CALIBRATE_IO tests your disks for different I/O workloads by issuing 1 MB random reads to your datafiles and reports the actual performance. Test #1 oracle@arg0...

I just found a nice SQL statement on asktom.oracle.com showing possible states of RAID 01 and 10 arrays in case of a disk failure: COL st_disk1 FORMAT a10 COL st_disk2 FORMAT a10 COL st_disk3 FORMAT a10 COL st_disk4 FORMAT a10 COL st_raid01 FORMAT a10 COL st_raid10...

There are some steps required to setup Oracle Real Application Clusters: Setup shared storage, see here Setup Solaris for RAC, see here Clone Solaris virtual machine (if you want to use VMs for test installation, see below) Test network connectivity between all nodes...