F 20160111 ORA的处理
1.删除 table,index的统计信息
analyze table <table> delete statistics;
analyze index <index> delete statistics;
desc exec dbms_statis.delete_table_stats;
desc exec dbms_statis.delete_index_stats;
exec dbms_statis.delete_table_stats(ownname => '<ownname>',tabname => '<tabname>');
exec dbms_statis.delete_index_stats(ownname => '<ownname>',tabname => '<tabname>');
2.ORA-03113
startup 报错
ORA-03113：end-of-file on communication channel
Process ID:16502
Session ID:570 Serial number:207
措施:
1.根据 Process ID，找到Session ID的trace日志文件
cd $ORACLE_BASE/diag/rdbms/<SID>/<SID>/trace
find ./ -name "*16502*"
more ia_arc3_16502.trc
发现 日志提示错误信息：
<txt> Errors in file ……
ORA-19815:WARNING:db_recovery_file_dest_size of …… is 100.00% used,……
说明 是由于 db_recovery_file_dest_size 被全部耗尽，完成的数据库宕机或无法启动。
解决措施：
1.扩大 db_recovery_file_dest_size
sqlplus /nolog
conn / as sysdba
startup nomount;
alter system set db_recovery_file_dest_size = 8000M;
2.清理 归档日志
select instance_name,status from v$instance; --NOMOUNT
alter database mount; --清理归档日志时，数据库状态至少为 MOUNT
exit;
rman target /; --rman target sys/sys
crosscheck archivelog all; --前提：数据库至少为 MOUNT状态
--delete archivelog until time 'sysdate-7';
delete expired archivelog all;
3.重启数据库
shutdown immediate
startup
5.查看 数据库相关信息
show parameter spfile; --若数据库启动默认为spfile文件，则alter system 的scope默认为 both.
show parameter db_recovery_file_dest_size;
参考：
Oracle回闪空间不足引起的ORA-03113问题排解 http://wenku.baidu.com/view/755ddc25bcd126fff7050bcd.html
oracle参数文件 http://wenku.baidu.com/view/44aa817ede80d4d8d05a4f73.html
Oracle数据库的启动和关闭 http://wenku.baidu.com/view/469bc64b767f5acfa1c7cd96.html
3.ORA-27102
startup报错
ORA-27102：out of memory
Linux-x86_64 Error:12:Cannot allocate memory
措施:
1.查看内存空间
free -m
grep -i mem /proc/meminfo
2 .查看ulimit
ulimit -l
ulimit -l unlimited #当前会话有效
3.释放内存
echo 1> /proc/sys/vm/drop_caches
echo 2> /proc/sys/vm/drop_caches
echo 3 > /proc/sys/vm/drop_caches
echo 0> /proc/sys/vm/swappiness
4.系统文件 /etc/security/limits.conf
oracle soft memlock 10485760
oracle hard memlock 10485760
5.reboot主机