Saturday, June 22, 2019

Setting Huge Pages in Linux


If your Linux based database server has huge amount of physical memory, it will be a good idea to enable huge pages so that memory could be used efficiently by Oracle instance. Setting huge pages means that you have bigger sized (2 MB) memory blocks in memory to allocate to Oracle SGA. Bigger memory block size would mean fewer number of total memory blocks, and this is where managing memory becomes efficient by the OS. I would recommend to use/enable huge pages if host’s physical memory size goes beyond 128G. But you can also set huge pages even for a small amount of memory.

Monday, June 10, 2019

Migrating from Filesystem to ASM

While migrating from file system to ASM, we create ASM instance on the current host before we could stamp the disks and create asm diskgroups to migrate existing datafiles from the file system to the ASM. Before we create/start ASM instance, we need to start “Oracle Cluster Synchronization Service” (CSS). So, we initiate “dbca” to create/start ASM instance as a first step. If you are using Windows, invoke dbca application using right click and “Run as Administrator”.

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