My Own DBA Experience

ORA-00845: MEMORY_TARGET not supported on this system There is always something that gets in the way. One problem I regularly stumble upon when installing a new Oracle 11g R2 installation is the following error when I try to start the database: SQL> startup nomount; ORA-00845: MEMORY_TARGET not supported on this system So I keep this post mainly for my own reference when installing a new database on a Linux system. This error comes up because you tried to use the  Automatic Memory Management (AMM)   feature  of Oracle 11g R2. Well done, but it seems that your shared memory filesystem (shmfs) is not big enough. So let’s look at the steps necessary to enlarge your shared memory filesystem to avoid the error above. First of all, login as root and have a look at the filesystem: [root@oracle-em oracle]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_oracleem-lv_root 93G 19G 69G 22% / tmpfs ...