Red Hat ENTERPRISE LINUX AS 2.1 - Guida di Installazione Pagina 22
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Chapter 7. Setting Shared Memory
16
# cat /proc/sys/kernel/shmmax
2147483648
The default shared memory limit for SHMMAX can be changed in the proc file system without reboot:
# echo 2147483648 > /proc/sys/kernel/shmmax
Alternatively, you can use sysctl(8) to change it:
# sysctl -w kernel.shmmax=2147483648
To make a change permanent, add the following line to the file /etc/sysctl.conf (your setting may
vary). This file is used during the boot process.
# echo "kernel.shmmax=2147483648" >> /etc/sysctl.conf
7.2. Setting SHMMNI Parameter
This parameter sets the system wide maximum number of shared memory segments.
Oracle recommends SHMMNI to be at least 4096 for Oracle 10g. For Oracle 9i on x86 the
recommended minimum setting is lower. Since these recommendations are minimum settings, it is
best to set it always to at least 4096 for 9i and 10g databases on x86 and x86-64 platforms.
To determine the system wide maximum number of shared memory segments, run:
# cat /proc/sys/kernel/shmmni
4096
The default shared memory limit for SHMMNI can be changed in the proc file system without reboot:
# echo 4096 > /proc/sys/kernel/shmmni
Alternatively, you can use sysctl(8) to change it:
# sysctl -w kernel.shmmni=4096
To make a change permanent, add the following line to the file /etc/sysctl.conf. This file is used
during the boot process.
# echo "kernel.shmmni=4096" >> /etc/sysctl.conf
7.3. Setting SHMALL Parameter
This parameter sets the total amount of shared memory pages that can be used system wide. Hence,
SHMALL should always be at least ceil(shmmax/PAGE_SIZE).
The default size for SHMALL in Red Hat Enterprise Linux 2.1, 3, 4 and 5 is 2097152 which is also
Oracle's recommended minimum setting for 9i and 10g on x86 and x86-64 platforms. In most cases
this setting should be sufficient since it means that the total amount of shared memory available on the
- Red Hat Enterprise 1
- Linux 5.1 1
- Red Hat Enterprise Linux 1
- Oracle Tuning Guide 1
- Edition 1.4 2
- Part I. Tuning and Optimizing 7
- Red Hat Enterprise Linux for 7
- Oracle Database 9i and 10g 7
- Introduction 9
- 2.1. General 11
- 2.3. The 64 bit Architecture 12
- Kernel Upgrades 13
- Kernel Boot Parameters 15
- Memory Usage and Page Cache 17
- Swap Space 19
- Setting Shared Memory 21
- 7.2. Setting SHMMNI Parameter 22
- 7.3. Setting SHMALL Parameter 22
- 7.4. Removing Shared Memory 23
- Setting Semaphores 25
- 8.4. The SEMOPM Parameter 26
- Setting File Handles 29
- Adjusting Network Settings 31
- I/O Support 37
- In Red Hat Enterprise Linux 3 39
- 13.1. General 43
- 13.2. Basics of Raw Devices 44
- Hat Enterprise Linux 4 and 5 46
- Please Note 47
- Without VLM 55
- Linux 2.1 56
- Segments in Oracle 9i 57
- Address for Shared Libraries 58
- 16.1. General 61
- Enterprise Linux 3, 4 and 5 61
- Using Very Large Memory (VLM) 65
- 10g Installation Files 71
- Verification 73
- Important Note 84
- $ du -m -s /u01 89
- 1963 /u01 89
- Creating Oracle User Accounts 93
- Creating Oracle Directories 95
- Setting Oracle Environments 97
- Important 109
- Hat Enterprise Linux 111
- Errors and Troubleshooting 113
- ./runInstaller Crashes 115
- Recovery Manager(rman) hangs 115
- ORA-12547: TNS:lost contact 119
- 30.2. Setting Swap Space 123
- 30.3. Setting Shared Memory 124
- Starting runInstaller 131
- Hat Advanced Server 2.1 133
- Hat Enterprise Linux 3 135
- If everything goes wrong 136
- Enterprise Linux 3 140
- $ su - oracle 141
- $ cd $ORACLE_HOME/network/lib 141
- $ agentctl start 141
- Hat Enterprise Linux 4 143
- Enterprise Linux 4 144
- Oracle9i Database 147
- $ORACLE_HOME/dbs/inittest.ora 148
- Oracle Installation Errors 149
- Errors in dbca 151
- Java Cannot Connect to X11 154
- Other Errors 155
- Reference List 157
- Appendix A. Revision History 159
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