(1) free
A common problem is:
How much memory is used by my applications, servers, users, and system processes? Or
How much memory is available now? If the memory used by running processes is greater than the available Ram, you need to move these
Linux IPC parameter settings-command method: Echo 80>/proc/sys/Vm/overcommit_ratio, etc
Msgmnb
Maximum byte limit for each message queue.
Msgmni
The maximum number of message queues of the entire system.
Msggsz
The size (in bytes) of the message
Online collection
Semsys: seminfo_semmni(Solaris9 Release)
InSolarisVersion 10 is out of date.
Description
Specifies the maximum number of signal identifiers.
Data Type
Signed integer
Default Value
10
Inter-process communicationOne, pipe,Limitations of Pipelines:(1) Half-duplex, data can only flow in one Direction(2) Pipelines are generally used only between processes that have a common ancestor, typically a pipeline is created by a process, and
Realization of advanced first out shared memory segment based on producer-consumer model
Producer consumer issues: This problem describes the two processes that share fixed-size buffers-so-called "producers" and "consumers"-that can occur when they
Start a RAC database today a node The Times is wrong!Sql> Startup MountORACLE instance started.Total System Global area 608174080 bytesFixed Size 1220844 bytesVariable Size 176164628 bytesDatabase buffers 427819008 bytesRedo buffers 2969600 bytesOra-
a database with a test environment, because the disk exploded, a new hard disk, when the database collapsed when the startSql> Startup MountORACLE instance started.Total System Global area 608174080 bytesFixed Size 1220844 bytesVariable Size 17616462
An IPC object----Message Queuing IPC Object Commands (1) View IPC objects in the systemIPCS-A display of all IPC objectsIpcs-s/-q/-m (2) Remove IPC objects from the systemIpcrm-q/-s/-m ID 1. Get the key value The first type:key_t Ftok (const char
This article introduces a ORA-27125 about oracle Database in linux: unabletocreatesharedmemorysegment solution.
This article introduces a ORA-27125: unable to create shared memory segment solution for oracle databases in linux.
This article
1.SGA
1.1 query the SGA-related view
1.1.1 GV $ sga_dynamic_components
SQL> select * From GV $ sga_dynamic_components;
PS:
1) The allocation unit of SGA is Granule. Components in SGA are composed of granule, and granule information is provided by
SQL> Conn/As sysdbaConnected to an idle instance.SQL> startupOracle instance started.
Total system global area 276824064 bytesFixed size 778736 bytesVariable Size 137371152 bytesDatabase buffers 138412032 bytesRedo buffers 262144 bytesORA-01102:
Original article: http://davidlu1001.blogbus.com/logs/85182548.html
Shared memory allows multiple processes to access the same memory space. It is the fastest available IPC format. It is designed to reduce the running efficiency of other
1. Create shared memory
Void * shmat (int shmid, void * shmaddr, int shmflg); this system call maps the shared memory zone corresponding to shmid to the virtual address space of the process, shmaddr is the starting address of the specified ing. If
Install oracle10 in SUSE Linux and solve the problem. suseoracle10
I have summarized my experience in installing oracle10g on Redhat5.5 and SUSE10.1.
When SUSE10 is installed with OraRun, the oracle user, oinstall group, and dba group will be
Linux shared memory practices (1) and linux shared memory practicesBasic concepts of shared memory
The shared memory zone is the fastest IPC format. Once such memory is mapped to the address space of the process that shares it, data transmission
A system suddenly loses power, and Oracle cannot be started after the system is started. The following error is reported during startup:
ORA-01102 cannot mount database in EXCLUSIVE modeError 1102 may be caused by the following possibilities:
1. In
SHMMAX Available physical memory Defines the maximum allowable size of one shared memory segment. the SHMMAX setting shoshould be large enough to hold the entire SGA in one shared memory segment. A low setting can cause creation of multiple shared
When installing the Oracle database, you need to set the following system kernel parameters for Oralce propulsion. These parameters are briefly described as follows (the parameter values are kept in the file/etc/sysctl. conf) Kernel. shmmax: the
Shared memory allows multiple processes to access the same memory space. it is the fastest available IPC format. It is designed to reduce the running efficiency of other communication mechanisms. It is often used in conjunction with other
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