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one asm instance can support multiple rdbms instances,and it is possible to run more than one asm instance to which the rdbms instance could connect,this potential many-to-many relationship btween the instance types is resolved by the cluster services.
ERROR at line 2:
ORA-02299: cannot validate (ICME.UK_PROJECT_SCORE) – duplicate keys found
LVM在后期因先前指定的路径空间不够时调整起来很方便，也可以就用于ASM，但是并不推荐ASM安装在LVM之上，因为LVM的功能在ASM上已存在。
11G前有sql profile、outline可以稳定执行计划，但有些文档中指出有时outline指定了但也有要能走新的执行计划，所以11g的BASELINE是OUTLINE的改进版。一般应用在版本升级或稳定特定SQL的执行计划，也可以修改指定SQL的执行计划，当OUTLINE与BASELINE有同时指定时BASELINE有优先权。
利用rman 可以方便的把datafile,tablespace,database在本地文件系统和ASM之间转换
[oracle@dbserver1 bin]$ ./opmnctl startall
failed to start a managed process after the maximum retry limit
[error 13079] [ecid: -] No matching CACHE element found in
总忘，小记 declare @c int declare @seq int set @seq=54000101 declare cur cursor for SELECT sectionid FROM StudySection WHERE (yearSemesterID = 2012001) open cur fetch next from cur into @c WHILE @@fetch_status=0 begin set @seq=@seq+1 print @seq update StudySection set oracleid=@seq where sectionid=@c fetch next from cur into @c end close cur deallocate cur
启用物化视图的重写有两个条件QUERY_REWRITE_ENABLED=true and materialized view enable query rewrite.
在CBO对查询sql 重写后估算cast后直接查询mv
[ohasd(4507)]CRS-2807:Resource ‘ora.asm’ failed to start automatically.
SQL> startup nomount
ORA-27102: out of memory
PRVF-5184 : Check of following Udev attributes of “rac2:/dev/asm-diskc” failed: “[Owner: Found=’root’ Expected=’grid’, Group: Found=’root’ Expected=’asmadmin’, Permissions: Found=’0600′ Expected=’0660′]”
Oracle Error :: INS-35171
Target database memory (stringMB) exceeds at least one of the selected nodes available shared memory (string MB).
OUI默认是带域名的名称如znode1.anbob.com/znode1-vip.anbob.com,去掉改为了znode1/znode1-vip 新增加的znode2/znode2-vip，再下一步到检查的时，检查通过。
注意当用veriable变量绑定时sqlplus autotrace有可能显示的执行计划不是实际的，用dbms_xplan.display_cursor查看
For XDMCP connection to Red Hat 5 EL or CentOS 5 or OEL5
1. Change runlevel to 5
Open /etc/inittab and set the initial runlevel to 5 as following:
id:5:initdefault:
Start of resource “ora.asm -init” failed
Failed to start ASM
Failed to start Oracle Clusterware stack
ins-40719 ipaddress configured for single client access name(scan):
rac-scan.anbob.com is already assigned to another system
数据库在运行一段时间后crash,遭遇ORA-00600: internal error code, arguments: [SKGMFAIL], [2], [4], [4], [1]，重启后又可以正常运行。
sys_op_descend – Returns value as it would be used in a descending index. This is essentially
reverse() function with output in hex.
[root@rac2 ~]# rdate -s 192.168.168.178
rac 全名Real Application Clusters，是ORACLE DATABASE 上的一个组件， 用共享存储的结构可以把1个数据库运行在多个分别计算的节点instance中 ，来提高了数据库的可用性，可以安装在企业版或标准版中，rac 出生于2001年的9I release 1, 以它的前身是oracle parallel server,rac 引入cache fusion机制提高实例间的资源同步。