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Linux Directory Structure


The Linux fi lesystem is organized as a hierarchy of directories. Some of the important Linux directories are: ■ /bin—Contains common Linux user commands, such as ls, sort, date, and chmod. ■ /boot—Has the bootable Linux kernel and boot loader configuration files (GRUB). ■ /dev—Contains files representing access points to devices on your systems. These include terminal devices (tty*), floppy disks (fd*), hard disks (hd* or sd*), RAM (ram*), and CD-ROM (cd*). Users can access these devices directly through these device files;

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SGA: System Global Area in Oracle


System Global Area The System Global Area (SGA) is typically a very large memory area shared by all Oracle processes. It is divided into distinct areas such as the buffer cache, the shared pool, and the log buffer, whose sizes are specified in the database configuration file (pfile or spfile). The various Oracle processes coordinate their access to these areas by using an interprocess communication (IPC) mechanisms called latches. Buffer Cache Typically, the buffer cache is the largest portion of

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