Increase /dev/shm tmpfs on RHEL/CentOS/OEL 7


Assalamu'alaikum Wr. Wb. Oracle database uses /dev/shm for its memory target allocation. So, if space of /dev/shm is running out to allocate memory_target, Oracle will failed to startup and shown ORA-00845: MEMORY_TARGET not supported on this system. By default, CentOS 7.4.1708 as my Oracle DB platform allocate only 1.4GB /dev/shm. So I have to increase… Continue reading Increase /dev/shm tmpfs on RHEL/CentOS/OEL 7

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scsi_id Not Shown Any Output on VMWare 12.5.X


Assalamu'alaikum Wr. Wb. My machine running CentOS Linux release 7.4.1708 (Core) on VMWare Workstation 12.5.3 Ubuntu. When I tried to create Oracle ASM disk with udev, no scsi_id output on everydisk. So, how could I create ASM disk? Let's solve scsi_id first. Okay, I tried for /dev/sda: /usr/lib/udev/scsi_id -g -u -d /dev/sda and no output.… Continue reading scsi_id Not Shown Any Output on VMWare 12.5.X

Change Hostname on CentOS/RHEL/OEL 7


Assalamu'alaikum Wr. Wb. My machine running CentOS Linux release 7.3.1611 (Core). There are some different between redhat based version under 7 and and above 6, include the commands. In this case, I wanna change the hostname from jeruk.buah.net to rhino.animal.net. At the redhat based version under 7, I can change by /etc/sysconfig/network. So, how about… Continue reading Change Hostname on CentOS/RHEL/OEL 7

Create Hotspot Tethering Ubuntu to Smartphone


Assalamu'alaikum Wr. Wb. Someday I want to connect my Smartphone to LAN/internet via my laptop. Ubuntu 14.04.5 LTS running on my laptop and connected to Smartfren broadband modem (ppp0) or sometimes LAN cable. But how to connect my smartphone to inside the network? Step one, create Wi-Fi connection via network manager. Click Create New Wi-Fi… Continue reading Create Hotspot Tethering Ubuntu to Smartphone

Migration Oracle ASM to File System Different Host


Assalamu'alaikum .. How to migration Oracle Database 11G ASM to other machine in file system? Source: Oracle Database Enterprise 11.2.0.4 64-bit Linux (ASM) Target: Oracle Database Enterprise 11.2.0.4 64-bit Linux (File System). Step 1: Backup source database using RMAN Step 2: Create pfile from Source DB SQL> CREATE PFILE='/home/orekel/rmanBackup/initasem.ora' from spfile'; Note: The target has… Continue reading Migration Oracle ASM to File System Different Host