今天性能库的centos 上面的oracle18c 数据库连接不上了 这里进行了一次简单处理
针对不同问题进行说明:
1. 实例时 blocked 的状态 问题现象:
LSNRCTL> status
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 18.0.0.0.0 - Production
Start Date 13-JUN-2019 21:13:25
Uptime 0 days 1 hr. 10 min. 34 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/oracle/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/gscloudlinuxdb/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=gscloudlinuxdb)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
Services Summary...
Service "ora18c" has 1 instance(s).
Instance "ora18c", status BLOCKED, has 1 handler(s) for this service...
The command completed successfully
解决办法 使用静态注册。
方法
vim /u01/oracle/network/admin/listener.ora
# status 信息里面有具体的位置。
# listener.ora Network Configuration File: /u01/oracle/network/admin/listener.ora
# Generated by Oracle configuration tools.
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /u01/oracle/)
(PROGRAM = extproc)
)
(SID_DESC =
(GLOBAL_DBNAME = ora18c)
(ORACLE_HOME = /u01/oracle)
(SID_NAME = ora18c)
)
)
LISTENER1 =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(ADDRESS = (PROTOCOL = TCP)(HOST = dengqiushuang)(PORT = 1521))
)
)
2. 解决监听链接不上的问题 现象
[oracle@gscloudlinuxdb admin]$ sqlplus / as sysdba
SQL*Plus: Release 18.0.0.0.0 - Production on Thu Jun 13 22:31:27 2019
Version 18.3.0.0.0
Copyright (c) 1982, 2018, Oracle. All rights reserved.
ERROR:
ORA-12547: TNS:lost contact
网上搜到很多方法:
参照: https://blog.51cto.com/hbxztc/1945049
1、查看操作系统内核参数是否无误
[oracle@rhel7 database]$ ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 15738
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 10240
cpu time (seconds, -t) unlimited
max user processes (-u) 2047
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
2、确认$ORACLE_HOME/bin/oracle文件权限是否有问题
(在rac下需要查看$ORACLE_HOME/bin/oracle和$GRID_HOME/bin/oracle两个文件),
正确权限为:
[oracle@normal adump]$ ll $ORACLE_HOME/bin/oracle
-rwsr-s--x 1 oracle oinstall 232399083 Aug 28 17:23 /u01/app/oracle/product/11.2.0/db_1/bin/oracle
如果权限不对
chmod 6751 $ORACLE_HOME/bin/oracle
3、检查一下环境变量
echo $ORACLE_HOME
echo $ORACLE_SID
echo $LD_LIBRARY_PATH --注意:不同的操作系统此环境变量会不同
echo $PATH
4、检查$ORACLE_HOME/bin/oracle 和 $ORACLE_HOME/rdbms/lib/config.o 的文件大小是否为0,
如果大小为0,需要重新编译oracle软件:
[oracle@normal backup]$ relink all
writing relink log to: /u01/app/oracle/product/11.2.0/db_1/install/relink.log
5、使用操作系统跟踪命令跟踪sqlplus连接过程,从而观察跟踪文件。
ltrace -f -o /tmp/sqlplus.log sqlplus / as sysdba
或truss命令
我这边很奇怪 我只是修改了一下 内核参数文件
vim /etc/security/limits.conf
我在最后面增加了这样的数据
* soft nproc 20470
* hard nproc 16384
* soft nofile 10240
* hard nofile 65536
* soft stack 10240
* hard stack 10240
把 oracle 修改为 所有的用户
重启或者不重启数据库 然后就可以了。
3. 结果为:
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