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Allowing the Oracle User to Change the Mapped Base Address for Shared Libraries
53
Allow the oracle user to execute /usr/local/bin/ChangeMappedBase via sudo without
password:
# echo "oracle ALL=NOPASSWD: /usr/local/bin/ChangeMappedBase" >> \
/etc/sudoers
Now the Oracle user can run /usr/local/bin/ChangeMappedBase to change the mapped_base
for its own shell:
$ su - oracle
$ cat /proc/$$/mapped_base; echo
1073741824
$ sudo /usr/local/bin/ChangeMappedBase
$ cat /proc/$$/mapped_base; echo
268435456$
To change the mapping for shared libraries automatically during the Oracle log in process, execute:
# echo "sudo /usr/local/bin/ChangeMappedBase" >> ~/.bash_profile
Now log in as oracle:
$ ssh oracle@localhost
oracle@localhost's password:
Last login: Sun Jan 7 13:59:22 2003 from localhost
$ cat /proc/$$/mapped_base; echo
268435456$
Note
If the mapped base address for shared libraries for the Oracle processes was changed,
then every Linux shell that spawns Oracle processes (for example, listener, sqlplus,
etc.) must have the same mapped base address as well. If you execute sqlplus to
connect to the local database, then you will get the following error message, seen in the
screen below, if the mapped_base for this shell is not the same as for the running Oracle
processes.
SQL> connect scott/tiger
ERROR:
ORA-01034: ORACLE not available
ORA-27102: out of memory
Linux Error: 12: Cannot allocate memory
Additional information: 1
Additional information: 491524
SQL>
- 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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