在linux的oracle的客户端，输入sql语句，出现 ORACLE not available Process ID: 0 Session ID: 0 Serial number: 0

SQL> select 1 from dual;
select 1 from dual
*
ERROR at line 1:
ORA-01034: ORACLE not available
Process ID: 0
Session ID: 0 Serial number: 0

[oracle@localhost ~]$ sqlplus / as sysdba
 
 
SQL*Plus: Release 11.2.0.1.0 Production on Tue Dec 17 16:35:56 2019
 
Copyright (c) 1982, 2009, Oracle.  All rights reserved.
 
Connected to an idle instance.
 

SQL> shutdown abort
ORACLE instance shut down.


SQL> startup mount;
ORACLE instance started.
 
Total System Global Area  521936896 bytes
Fixed Size		    2214936 bytes
Variable Size		  499123176 bytes
Database Buffers	   16777216 bytes
Redo Buffers		    3821568 bytes
Database mounted.


SQL> show parameter db_recovery_file_dest_size;
 
NAME				     TYPE

VALUE

db_recovery_file_dest_size	     big integer
10G
 


SQL> alter system set db_recovery_file_dest_size=15G;
 
System altered.
 



SQL> alter database open;
 
Database altered.
 


SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.




SQL> startup;
ORACLE instance started.
 
Total System Global Area  521936896 bytes
Fixed Size		    2214936 bytes
Variable Size		  499123176 bytes
Database Buffers	   16777216 bytes
Redo Buffers		    3821568 bytes
Database mounted.
Database opened.