Oracle数据库闪回区空间满解决方法
今天早上一到单位，发现EMCC上有一台Oracle数据库服务器的概览页面出现黄色报警，
查询alert_orcl13.log发现如下报错，
Errors in file /u01/app/oracle/diag/rdbms/orcl13/orcl13/trace/orcl13_arc3_34080.trc:
ORA-19815: WARNING: db_recovery_file_dest_size of 68719476736 bytes is 100.00% used, and has 0 remaining bytes available.
system command was used to delete files, then use RMAN CROSSCHECK and
************************************************************************
DELETE EXPIRED commands.
You have following choices to free up spacefrom recovery area:
************************************************************************
1. Consider changing RMAN RETENTION POLICY.If you are using Data Guard,
ARC0: Error 19809 Creating archive log fileto '+DATA'
then consider changing RMAN ARCHIVELOG DELETION POLICY.
2. Back up files to tertiary device such astape using RMAN
BACKUP RECOVERY AREA command.
3. Add disk space and increasedb_recovery_file_dest_size parameter to
reflect the new space.
4. Delete unnecessary files using RMANDELETE command. If an operating
system command was used to delete files, then use RMAN CROSSCHECK and
DELETE EXPIRED commands.
************************************************************************
发现闪回区的容量已经达到100%，于是查找闪回区的容量当前为多少G？
SYS@orcl13> show parameterdb_recovery_file_dest_size;
NAME TYPE VALUE
---------------------------- ------------ ---------
db_recovery_file_dest_size big integer 64G
增大闪回区的容量为100G
顺便查看一下归档文件所在的位置，
噢，顿时明白，是归档文件保存在闪回区，把闪回区的容量撑爆了。
归档文件一直在增加，有也可能是用rman备份的时候，没有设置归档日志的清除策略，也有可能是没有进行rman备份。
查看一下是否进行了rman备份
原来是没有进行rman备份，由于是测试库，在开启归档功能以后，没有用rman备份导致的
现在把rman备份开启
再次查看alert_orcl13.log的日志文件，已经切换归档操作，一切正常了。
