ORA-00845 Oacle 11g常见的shm问题
问题报错过程srv-bioradb:~gt; sqlplus / as sysdba SQL*Plus: Release 11.2.0.3.0 Production on Thu Jul 25 18:27:45 2013 Co
问题报错过程
srv-bioradb:~> sqlplus / as sysdba
SQL*Plus: Release 11.2.0.3.0 Production on Thu Jul 25 18:27:45 2013
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Connected to an idle instance.
SQL> startup
ORA-00845: MEMORY_TARGET not supported on this system
SQL> show sga;
ORA-01034: ORACLE not available
Process ID: 0
Session ID: 0 Serial number: 0
上网google发现是shm设置太小的问题
重新设置shm
1）卸载shm，遭遇报错
srv-bioradb:~> df -h
df: `/root/.gvfs': Permission denied
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/system-lv_root 358G 8.5G 331G 3% /
devtmpfs 127G 624K 127G 1% /dev
tmpfs 195G 932K 195G 1% /dev/shm
/dev/cciss/c0d0p1 1.6G 106M 1.4G 8% /boot
/dev/mapper/data-lv_data 2.3T 1.8T 364G 84% /oracle
/dev/mapper/oraclevg-oraclelv01 2.9T 201M 2.7T 1% /oracle1
srv-bioradb:~> more /etc/fstab
/dev/system/lv_swap swap swap defaults 0 0
/dev/system/lv_root / ext3 acl,user_xattr 1 1
/dev/disk/by-id/cciss-3600508b1001c59983f902a5494c7d076-part1 /boot
ext3 acl,user_xattr 1 2
#/dev/data/lv_data /oracle_bk ext3 acl,user_xattr 1 2
/dev/data/lv_data /oracle ext3 defaults 0 0
proc /proc proc defaults 0 0
sysfs /sys sysfs noauto 0 0
debugfs /sys/kernel/debug debugfs noauto 0 0
usbfs /proc/bus/usb usbfs noauto 0 0
devpts /dev/pts devpts mode=0620,gid=5 0 0
#/dev/mapper/oraclevg-oraclelv01 /oracle ext3 defaults 0 0
#/dev/mapper/oraclevg-oraclelv02 /oracle/oradata2 ext3 defaults 0 0
srv-bioradb:~>
srv-bioradb:~>
srv-bioradb:~> umount /dev/shm
umount: /dev/shm is not in the fstab (and you are not root)
srv-bioradb:~> exit
exit
srv-bioradb:~ #
srv-bioradb:~ # umount /dev/shm
umount: /dev/shm: device is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))
srv-bioradb:~ #
2）查看谁在使用shm，踢掉
srv-bioradb:~ # fuser -cu /dev/shm
/dev/shm: 12555m(root) 12614m(root) 12622m(root)
srv-bioradb:~ # ps -ef | grep 12555
root 12555 1 0 Jul24 ? 00:00:05 /usr/lib/gnome-settings-daemon/gnome-settings-daemon
root 43817 43683 0 18:36 pts/2 00:00:00 grep 12555
srv-bioradb:~ # ps -ef | grep 12614
root 12614 12445 0 Jul24 ? 00:00:00 gnome-volume-control-applet
root 43819 43683 0 18:37 pts/2 00:00:00 grep 12614
srv-bioradb:~ # ps -ef | grep 12622
root 12622 1 0 Jul24 ? 00:00:00 /usr/bin/pulseaudio --start
root 43821 43683 0 18:37 pts/2 00:00:00 grep 12622
srv-bioradb:~ # kill -9 12555
srv-bioradb:~ # kill -9 12614
srv-bioradb:~ # kill -9 12622
这里啰嗦一下，查找到的进程必须ps一下看看具体是什么进程在占用shm文件系统，，如果是应用程序占用，退出程序。如果是僵死进程或不重要的shell终端，直接kill即可
3）再次卸载shm
srv-bioradb:~ #
srv-bioradb:~ # umount /dev/shm
srv-bioradb:~ #
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
When might a full table scan be faster than using an index in MySQL?
Apr 09, 2025 am 12:05 AM
Full table scanning may be faster in MySQL than using indexes. Specific cases include: 1) the data volume is small; 2) when the query returns a large amount of data; 3) when the index column is not highly selective; 4) when the complex query. By analyzing query plans, optimizing indexes, avoiding over-index and regularly maintaining tables, you can make the best choices in practical applications.
Explain InnoDB Full-Text Search capabilities.
Apr 02, 2025 pm 06:09 PM
InnoDB's full-text search capabilities are very powerful, which can significantly improve database query efficiency and ability to process large amounts of text data. 1) InnoDB implements full-text search through inverted indexing, supporting basic and advanced search queries. 2) Use MATCH and AGAINST keywords to search, support Boolean mode and phrase search. 3) Optimization methods include using word segmentation technology, periodic rebuilding of indexes and adjusting cache size to improve performance and accuracy.
Can I install mysql on Windows 7
Apr 08, 2025 pm 03:21 PM
Yes, MySQL can be installed on Windows 7, and although Microsoft has stopped supporting Windows 7, MySQL is still compatible with it. However, the following points should be noted during the installation process: Download the MySQL installer for Windows. Select the appropriate version of MySQL (community or enterprise). Select the appropriate installation directory and character set during the installation process. Set the root user password and keep it properly. Connect to the database for testing. Note the compatibility and security issues on Windows 7, and it is recommended to upgrade to a supported operating system.
Difference between clustered index and non-clustered index (secondary index) in InnoDB.
Apr 02, 2025 pm 06:25 PM
The difference between clustered index and non-clustered index is: 1. Clustered index stores data rows in the index structure, which is suitable for querying by primary key and range. 2. The non-clustered index stores index key values and pointers to data rows, and is suitable for non-primary key column queries.
MySQL: Simple Concepts for Easy Learning
Apr 10, 2025 am 09:29 AM
MySQL is an open source relational database management system. 1) Create database and tables: Use the CREATEDATABASE and CREATETABLE commands. 2) Basic operations: INSERT, UPDATE, DELETE and SELECT. 3) Advanced operations: JOIN, subquery and transaction processing. 4) Debugging skills: Check syntax, data type and permissions. 5) Optimization suggestions: Use indexes, avoid SELECT* and use transactions.
The relationship between mysql user and database
Apr 08, 2025 pm 07:15 PM
In MySQL database, the relationship between the user and the database is defined by permissions and tables. The user has a username and password to access the database. Permissions are granted through the GRANT command, while the table is created by the CREATE TABLE command. To establish a relationship between a user and a database, you need to create a database, create a user, and then grant permissions.
Can mysql and mariadb coexist
Apr 08, 2025 pm 02:27 PM
MySQL and MariaDB can coexist, but need to be configured with caution. The key is to allocate different port numbers and data directories to each database, and adjust parameters such as memory allocation and cache size. Connection pooling, application configuration, and version differences also need to be considered and need to be carefully tested and planned to avoid pitfalls. Running two databases simultaneously can cause performance problems in situations where resources are limited.
Explain different types of MySQL indexes (B-Tree, Hash, Full-text, Spatial).
Apr 02, 2025 pm 07:05 PM
MySQL supports four index types: B-Tree, Hash, Full-text, and Spatial. 1.B-Tree index is suitable for equal value search, range query and sorting. 2. Hash index is suitable for equal value searches, but does not support range query and sorting. 3. Full-text index is used for full-text search and is suitable for processing large amounts of text data. 4. Spatial index is used for geospatial data query and is suitable for GIS applications.
