摘要
超出最大进程数
报错信息
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| ORA-00020: maximum number of processes (150) exceeded
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查询当前默认配置的 process 是多少
常规方法无法登录，我们连接时候要加上-prelim参数
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| $ sqlplus -prelim/ as sysdba
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| SQL> set linesize 500;
SQL> show parameter processes;
NAME TYPE VALUE
------------------------------------ ---------------------- ------------------------------
aq_tm_processes integer 1
db_writer_processes integer 1
gcs_server_processes integer 0
global_txn_processes integer 1
job_queue_processes integer 1000
log_archive_max_processes integer 4
processes integer 150
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修改 processes 到500
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| SQL> alter system set processes=500 scope = spfile;
SQL> shutdown immediate;
SQL> startup
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Oracle DG 备库启动报错如下
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| ORA-10458: standby database requires recovery
ORA-01196: file 1 is inconsistent due to a failed media recovery session
ORA-01110: data file 1: '/oradata/orcl/datafile1/system01.dbf'
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在备库执行
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| SQL> shutdown immediate;
SQL> startup mount;
SQL> alter database recover managed standby database using current logfile disconnect from session;
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在主库上切换日志
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| SQL> alter system switch logfile;
sql> select SEQUENCE#, FIRST_TIME, NEXT_TIME, APPLIED, ARCHIVED from V$ARCHIVED_LOG order by FIRST_TIME;
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如果返回结果APPLIED都是YES或者只有最后一个是NO的话，说明全部归档日志全部已经归档完了，此时到备库上上操作：
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| SQL> alter database recover managed standby database cancel;
SQL> alter database open;
SQL> alter database recover managed standby database using current logfile disconnect from session;
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以上操作仍无法解决可能需要以下操作
关闭主库shutdown immediate
拷贝归档日志到从库，并进行注册
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| SQL> alter database register physical logfile '/data/oracle/archivelog/1_758_991156185.dbf';
SQL> alter database register physical logfile '/data/oracle/archivelog/1_759_991156185.dbf';
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重启主从（注意顺序）
a) 关闭主库和备库：shutdown immediate
b) 将主库的密码文件复制到备库(在主库操作)
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| $ scp $ORACLE_HOME/dbs/orapworcl oracle@standbydb:$ORACLE_HOME/dbs/
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Primary log shipping client not logged on standby
问题解决方式其实很简单，在主库重新生成口令文件传到备库中即可。问题的主要思路还是要根据警告日志的内容做对应的排查。
a) 关闭主库和备库：按照正常流程关闭
b) 将主库的密码文件复制到备库(在主库操作)
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| $ scp $ORACLE_HOME/dbs/orapworcl oracle@standbydb:$ORACLE_HOME/dbs/
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通过 top 获得占用率高的 pid，使用 pid 查询获得 addr
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| sql> select addr from v$process where spid=94499;
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使用 addr 查询获得 sql_id
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| sql> select sql_id from v$session where paddr='000000008CCB5A70';
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使用sql_id 获得具体 sql
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| sql> select * from v$sql where sql_id = '86bb6nk7x0bc2';
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