SQL Exception Handling remember once PLUS can not log in

SQL Exception Handling remember once PLUS can not log in

phenomenon

1. PLSQL Developer accessed via remote data card found dead did not respond.

2. By Sqlplus access data also hang dead in the login screen, and can not be canceled by Ctrl + C

[oracle@oracle ~]$ sqlplus / as sysdba
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SQL*Plus: Release 11.2.0.4.0 Production on Tue Jul 30 10:31:33 2019
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Copyright (c) 1982, 2013, Oracle.  All rights reserved.
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Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

3. alert logs without any error

4. Cpu database without pressure

5. The number of connections does not reach the setting processes

deal with

Oracle $  sqlplus  - prelim  /  AS  SYSDBA 
the SQL >  the oradebug  setmypid 
the SQL >  the oradebug  unlimit 
the SQL >  the oradebug  hanganalyze  . 3 
the SQL >  the oradebug  the dump  systemstate  266 
< certain time interval, such as 20 is seconds and once data downsampling performed .  > 
the SQL >  the oradebug  hanganalyze  . 3 
the SQL >  oradebug  dump  systemstate  266 
SQL >  oradebug  tracefile_name 
SQL> oradebug close_trace

Trace files generated by direct search keywordsblocker

      Dumping 1 direct blocker(s):
        inst: 1, sid: 2282, ser: 85
      Dumping final blocker:
        inst: 1, sid: 2282, ser: 85

final blocker sid: 2282, 2282 and then search for and find the following information

SO: 0x552acf480, type: 4, owner: 0x551708ef0, flag: INIT/-/-/0x00 if: 0x3 c: 0x3
     proc=0x551708ef0, name=session, file=ksu.h LINE:12729, pg=0
    (session) sid: 2282 ser: 85 trans: (nil), creator: 0x551708ef0
              flags: (0x10041) USR/- flags_idl: (0x1) BSY/-/-/-/-/-
              flags2: (0x40009) -/-/INC
              DID: , short-term DID: 
              txn branch: (nil)
              edition#: 100              oct: 3, prv: 0, sql: 0x557a67f20, psql: 0x557a692d8, user: 0/SYS
    ksuxds FALSE at location: 0
    service name: SYS$USERS
    client details:
      O/S info: user: oracle, term: UNKNOWN, ospid: 81552
      machine: dbh01 program: oracle@dbh01 (J000)
      application name: DBMS_SCHEDULER, hash value=2478762354
      action name: SM$CLEAN_AUTO_SPLIT_MERGE, hash value=1890521210
    Current Wait Stack:
     0: waiting for 'library cache: mutex X'
        idn=0x41bd76b6, value=0x2000000000, where=0x4f
        wait_id=71 seq_num=72 snap_id=1
        wait times: snap=3 min 13 sec, exc=3 min 13 sec, total=3 min 13 sec
        wait times: max=infinite, heur=872 min 45 sec
        wait counts: calls=17580 os=17579
        in_wait=1 iflags=0x15b2
    There are 91 sessions blocked by this session.
    Dumping one waiter:
      inst: 1, sid: 16, ser: 157
      wait event: 'latch: shared pool'
        p1: 'address'=0x6010f288
        p2: 'number'=0x150
        p3: 'tries'=0x0
      row_wait_obj#: 4294967295, block#: 0, row#: 0, file# 0
      min_blocked_time: 52361 secs, waiter_cache_ver: 60751
    Wait State:
      fixed_waits=0 flags=0x22 boundary=(nil)/-1

There are the following important information:

(session) sid: 2282

ospid: 81552

machine: dbh01

program: oracle@dbh01 (J000)

application name: DBMS_SCHEDULER, hash value=2478762354

action name: SM$CLEAN_AUTO_SPLIT_MERGE, hash value=1890521210

0: waiting for 'library cache: mutex X'

There are 91 sessions blocked by this session.

* Kill the OS process 81552, fault recovery. **