昨天处理了一个小case，后来发现不知道哪位亲爱的朋友修改了/etc/hosts文件，导致数据库趴下了，记录一下
[root@padb ~]# su - oracle <padb:padb:/home/oracle>$ <padb:padb:/home/oracle>$ps -ef|grep ora_ oracle 5874 5847 0 11:35 pts/3 00:00:00 grep ora_ <padb:padb:/home/oracle>$lsnrctl status LSNRCTL for Linux: Version 11.2.0.3.0 - Production on 12-JUL-2018 11:35:33 Copyright (c) 1991,2011,Oracle. All rights reserved. Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521))) ###########监听卡在这里了#################### <padb:padb:/home/oracle>$ps -ef|grep lsnr oracle 5808 5757 0 11:34 pts/1 00:00:00 lsnrctl start oracle 5810 1 99 11:34 ? 00:01:36 /u01/app/oracle/product/11.2.0/dbhome_1/bin/tnslsnr LISTENER -inherit oracle 5877 5847 0 11:35 pts/3 00:00:00 grep lsnr ##############进程在 <padb:padb:/home/oracle>$kill -9 5810 <padb:padb:/home/oracle>$ps -ef|grep lsnr oracle 5879 5847 0 11:35 pts/3 00:00:00 grep lsnr ##############kill 进程 <padb:padb:/home/oracle>$sqlplus / as sysdba sql*Plus: Release 11.2.0.3.0 Production on Thu Jul 12 11:35:56 2018 Copyright (c) 1982,Oracle. All rights reserved. Connected. sql> ###############很诡异的一个状态，竟然connected了 ##############查看日志 <padb:padb:/home/oracle>$uptime 11:36:27 up 50 min,4 users,load average: 0.42,0.33,0.47 <padb:padb:/home/oracle>$adrci ADRCI: Release 11.2.0.3.0 - Production on Thu Jul 12 11:36:35 2018 Copyright (c) 1982,Oracle and/or its affiliates. All rights reserved. ADR base = "/u01/app/oracle" adrci> show alert Choose the alert log from the following homes to view: 1: diag/clients/user_oracle/host_61728193_80 2: diag/rdbms/padb/padb 3: diag/tnslsnr/localhost/listener 4: diag/tnslsnr/padb/listener Q: to quit Please select option: 2 Output the results to file: /tmp/alert_5886_14061_padb_1.ado 2017-12-05 18:40:29.250000 +08:00 Starting ORACLE instance (normal) ****************** Large Pages Information ***************** Total Shared Global Region in Large Pages = 0 KB (0%) Large Pages used by this instance: 0 (0 KB) Large Pages unused system wide = 0 (0 KB) (alloc incr 64 MB) Large Pages configured system wide = 0 (0 KB) Large Page size = 2048 KB RECOMMENDATION: Total Shared Global Region size is 24 GB. For optimal performance,prior to the next instance restart increase the number of unused Large Pages by atleast 12097 2048 KB Large Pages (24 GB) system wide to get 100% of the Shared Global Region allocated with Large pages *********************************************************** LICENSE_MAX_SESSION = 0 LICENSE_SESSIONS_WARNING = 0 Shared memory segment for instance monitoring created Picked latch-free SCN scheme 3 Machine:x86_64 VM name:VMWare Version: 6 home_1/dbs/spfilepadb.ora System parameters with non-default values: processes = 500 sessions = 780 sga_target = 24192M control_files = "/u01/app/oracle/padb/control01.ctl" control_files = "/u01/app/oracle/padb/control02.ctl" db_block_size = 8192 compatible = "11.2.0.0.0" undo_tablespace = "UNDOTBS1" remote_login_passwordfile= "EXCLUSIVE" db_domain = "" dispatchers = "(PROTOCOL=TCP) (SERVICE=padbXDB)" audit_file_dest = "/u01/app/oracle/admin/padb/adump" audit_trail = "DB" db_name = "padb" open_cursors = 300 pga_aggregate_target = 8053M diagnostic_dest = "/u01/app/oracle" USER (ospid: 5117): terminating the instance due to error 119 ORACLE_HOME = /u01/app/oracle/product/11.2.0/dbhome_1 System name:Linux Node name:padb Release:2.6.32-573.el6.x86_64 Version:#1 SMP Wed Jul 1 18:23:37 EDT 2015 Machine:x86_64 VM name:VMWare Version: 6 Using parameter settings in server-side spfile /u01/app/oracle/product/11.2.0/dbb home_1/dbs/spfilepadb.ora System parameters with non-default values: processes = 500 sessions = 780 sga_target = 24192M control_files = "/u01/app/oracle/padb/control01.ctl" control_files = "/u01/app/oracle/padb/control02.ctl" db_block_size = 8192 compatible = "11.2.0.0.0" undo_tablespace = "UNDOTBS1" remote_login_passwordfile= "EXCLUSIVE" db_domain = "" dispatchers = "(PROTOCOL=TCP) (SERVICE=padbXDB)" audit_file_dest = "/u01/app/oracle/admin/padb/adump" audit_trail = "DB" db_name = "padb" open_cursors = 300 pga_aggregate_target = 8053M diagnostic_dest = "/u01/app/oracle" USER (ospid: 5117): terminating the instance due to error 119 remote_login_passwordfile= "EXCLUSIVE" db_domain = "" dispatchers = "(PROTOCOL=TCP) (SERVICE=padbXDB)" audit_file_dest = "/u01/app/oracle/admin/padb/adump" audit_trail = "DB" db_name = "padb" open_cursors = 300 pga_aggregate_target = 8053M diagnostic_dest = "/u01/app/oracle" 2018-07-12 09:45:28.043000 +08:00 USER (ospid: 18388): terminating the instance due to error 119 Instance terminated by USER,pid = 18388 ############实例异常终止了 2018-07-12 09:47:53.701000 +08:00 Starting ORACLE instance (normal) "/tmp/alert_5886_14061_padb_1.ado" 13117L,632251C written <padb:padb:/home/oracle>$df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 627G 512G 84G 86% / tmpfs 32G 72K 32G 1% /dev/shm /dev/sda1 477M 42M 410M 10% /boot <padb:padb:/home/oracle>$ <padb:padb:/home/oracle>$sqlplus / as sysdba sql*Plus: Release 11.2.0.3.0 Production on Thu Jul 12 11:47:10 2018 Copyright (c) 1982,Oracle. All rights reserved. Connected. sql> startup ORA-00119: invalid specification for system parameter LOCAL_LISTENER ORA-00130: invalid listener address '(ADDRESS=(PROTOCOL=TCP)(HOST=padb)(PORT=1521))' sql> ##########第一意识ping了一下主机名 <padb:padb:/u01/app/oracle/diag/rdbms/padb/padb/trace>$ping padb ping: unknown host padb <padb:padb:/u01/app/oracle/diag/rdbms/padb/padb/trace>$ping padb ping: unknown host padb <padb:padb:/u01/app/oracle/diag/rdbms/padb/padb/trace>$hostname padb <padb:padb:/u01/app/oracle/diag/rdbms/padb/padb/trace>$more /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 padb 10.18.0.84 ##到这里，只能无语了,外加18个点点点，这是啥啊！！！！ <padb:padb:/u01/app/oracle/diag/rdbms/padb/padb/trace>$ping padb ping: unknown host padb <padb:padb:/u01/app/oracle/diag/rdbms/padb/padb/trace>$exit logout ####修改host文件 [root@padb ~]# vi /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 10.18.0.84 padb "/etc/hosts" 3L,175C written [root@padb ~]# [root@padb ~]# [root@padb ~]# ping padb PING padb (10.18.0.84) 56(84) bytes of data. 64 bytes from padb (10.18.0.84): icmp_seq=1 ttl=64 time=0.029 ms 64 bytes from padb (10.18.0.84): icmp_seq=2 ttl=64 time=0.021 ms ^C --- padb ping statistics --- 2 packets transmitted,2 received,0% packet loss,time 1804ms rtt min/avg/max/mdev = 0.021/0.025/0.029/0.004 ms [root@padb ~]# Refer to the sql*Plus User's Guide and Reference for more information. <padb:padb:/home/oracle>$sqlplus / as sysdba sql*Plus: Release 11.2.0.3.0 Production on Thu Jul 12 12:01:43 2018 Copyright (c) 1982,Oracle. All rights reserved. Connected to an idle instance. sql> startup ORACLE instance started. Total System Global Area 2.5254E+10 bytes Fixed Size 2240096 bytes Variable Size 3221225888 bytes Database Buffers 2.2012E+10 bytes Redo Buffers 18718720 bytes Database mounted. Database opened. sql> exit原文链接：https://www.f2er.com/oracle/205799.html
