Linux installation Oracle Kernel parameter configuration instructions

Fs.file-max = 6815744

--Represents the maximum number of file handles, indicating the number of files that can be opened on a Linux system.

Fs.aio-max-nr = 1048576

--This parameter restricts the concurrent outstanding requests and avoids the I/O subsystem failure. The recommended value is--1048576=1024*1024, which is 1024K.

Kernel.shmall = 2097152

--Represents the total amount of available shared memory, in units of pages, on a 32-bit system with a page equal to 4kB, or 4096 bytes. The maximum size of a shared memory segment is 16G, so the number of shared memory pages required is 16gb/4kb=16777216kb/4kb=4194304 (page). That is 16GB physical memory under 64Bit system, set Kernel.shmall = 4194304 to meet the requirements (almost twice times the original setting 2097152). The shmmax parameter can then be adjusted to 16G, while you can modify the sga_max_size and sga_target 12G (you want to set the maximum size of the SGA, of course, it can be 2g~14g, etc., Also coordinate other memory uses such as PGA parameters and OS, and cannot be set too full, such as 16G.

Kernel.shmmax = 2147483648

--Represents the maximum value of a single shared memory segment, in bytes, which is typically half of the physical memory, but it doesn't matter if it's larger, which is set at 4GB, which is [4294967296/1024/1024/1024]=4g. The Shmmax setting should be large enough to accommodate the entire SGA under a shared memory segment, and setting it too low may result in the need to create multiple shared memory segments, which may result in degraded system performance.

Kernel.shmmni = 4096

--Represents the minimum value for a single shared memory segment, typically 4kB, or 4096bit.

Kernel.sem = 250 32000 100 128

--250 is the value of the parameter SEMMSL, which represents the maximum number of semaphores that can be contained in a semaphore collection.

--32000 is the value of the parameter Semmns, which represents the maximum number of semaphores that can be allowed within the system.

--100 is the value of the parameter semopm that represents the number of operations that a single semopm () call can perform on a semaphore collection.

--128 is the value of the parameter Semmni, which represents the total number of system semaphore sets.

Net.ipv4.ip_local_port_range = 9000 65500

--represents the range of ports.

Net.core.rmem_default = 262144

--Represents the default value (in bytes) for receiving the socket buffer size.

Net.core.rmem_max = 4194304

--Indicates the maximum value of the receive socket buffer size, in bytes

Net.core.wmem_default = 262144

--Represents the default value (in bytes) for sending the socket buffer size.

Net.core.wmem_max = 1048576

--Represents the maximum size, in bytes, of the send socket buffer.

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Linux installation Oracle Kernel parameter configuration instructions