ORA-01034: ORACLE not available ORA-27101: shared memory realm does not exist
记录一次问题：
数据库连接错误
ORA-01034: ORACLE not available ORA-27101: shared memory realm does not exist Linux-x86_64 Error: 2: No such file or directory Additional information: 4376 Additional information: -425214885 ORA-01034: ORACLE not available ORA-27101: shared memory realm
分析：
1、是不是内存设置的用问题。
2、监听设置问题
找问题
1、看出数据库状态，正常
SQL> select status from v$instance;
STATUS
------------
OPEN
2、查看alert_orcl.log日志
发现问题 ：数据库的pmon进程不能把监听注册到实例
WARNING: Invalid value for listener related parameter MIXED LISTENER
2022-12-30T11:08:29.723018+08:00
ORA-00141: all addresses specified for parameter LOCAL_LISTENER are invalid
ORA-00132: syntax error or unresolved network name 'LISTENER_PROD'
Starting background process PMON
内存参数
Starting ORACLE instance (normal) (OS id: 38463)
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****************************************************
Sys-V shared memory will be used for creating SGA
****************************************************
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**********************************************************************
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Dump of system resources acquired for SHARED GLOBAL AREA (SGA)
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Per process system memlock (soft) limit = 32G
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Expected per process system memlock (soft) limit to lock
instance MAX SHARED GLOBAL AREA (SGA) into memory: 9602M
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Available system pagesizes:
4K, 2048K
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Supported system pagesize(s):
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PAGESIZE AVAILABLE_PAGES EXPECTED_PAGES ALLOCATED_PAGES ERROR(s)
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4K Configured 7 2457607 NONE
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2048K 0 4801 0 NONE
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RECOMMENDATION:
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1. For optimal performance, configure system with expected number
of pages for every supported system pagesize prior to the next
instance restart operation.
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**********************************************************************
3、查看内存分配
SQL> show parameter sga
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
allow_group_access_to_sga boolean FALSE
lock_sga boolean FALSE
pre_page_sga boolean TRUE
sga_max_size big integer 9600M
sga_min_size big integer 0
sga_target big integer 9600M
unified_audit_sga_queue_size integer 1048576
SQL> show parameter memory
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
hi_shared_memory_address integer 0
inmemory_adg_enabled boolean TRUE
inmemory_automatic_level string OFF
inmemory_clause_default string
inmemory_expressions_usage string ENABLE
inmemory_force string DEFAULT
inmemory_max_populate_servers integer 0
inmemory_optimized_arithmetic string DISABLE
inmemory_prefer_xmem_memcompress string
inmemory_prefer_xmem_priority string
inmemory_query string ENABLE
SQL> show parameter spfile
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
spfile string /u01/app/oracle/product/19.3.0
/dbhome_1/dbs/spfileorcl.ora
检查监听没有问题后，查看了下spfile，发现了问题
尝试解决
用pfile启动。重新注册下监听试试
SQL> shu immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup pfile=/u01/app/oracle/product/19.3.0/dbhome_1/dbs/initorcl.ora;
ORACLE instance started.
Total System Global Area 1.0066E+10 bytes
Fixed Size 12445832 bytes
Variable Size 1577058304 bytes
Database Buffers 8455716864 bytes
Redo Buffers 21106688 bytes
Database mounted.
Database opened.
SQL> alter system register;
System altered.
数据库注册监听正常了
[oracle@zfb-jhdsj-hysjkserver1 admin]$ lsnrctl status
LSNRCTL for Linux: Version 19.0.0.0.0 - Production on 30-DEC-2022 11:40:41
Copyright (c) 1991, 2019, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=10.20.6.138)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 19.0.0.0.0 - Production
Start Date 30-DEC-2022 11:25:17
Uptime 0 days 0 hr. 15 min. 24 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/oracle/product/19.3.0/dbhome_1/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/zfb-jhdsj-hysjkserver1/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=10.20.6.138)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
Services Summary...
Service "PROD" has 2 instance(s).
Instance "ORCL", status UNKNOWN, has 1 handler(s) for this service...
Instance "orcl", status READY, has 1 handler(s) for this service...
Service "PRODXDB" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
The command completed successfully
重新创建spfile
SQL> create spfile from pfile;
File created.
重新起库，数据库连接正常
此次问题是参数文件的异常导致监听无法注册。