使用 oradebug 转储 systemstate / processstate

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当数据库出现一些挂起状态时，如果sqlplus仍然可以连接，可能视图查询没有相应，但是可以通过oradebug工具来进行进程及系统状态信息的转储，从而可以进行Hang分析。

DUMP进程状态可以使用：

　　alter sessions set events 'immediate trace name processstate level <level>'；
或者使用：
　　oradebug setmypid
　　oradebug ulimit
　　oradebug dump processstate<level>

当诊断数据库挂起条件时可以DUMP系统状态：
　　alter sessions set events 'immediate trace name systemstate level <level>'；
　　或：
　　oradebug setmypid
　　oradebug ulimit
　　oradebug dump systemstate <level>

如果为了获取全面一点的信息，可以使用Level 10。
SQL> oradebug setmypid
SQL> oradebug unlimit
SQL> oradebug dump systemstate 10

今天一个朋友的请求帮助，获得的系统状态如下：

System State 1
~~~~~~~~~~~~~~~~
1:
2: waiting for 'pmon timer'            wait
3: waiting for 'rdbms ipc message'     wait
4: waiting for 'rdbms ipc message'     wait
5: waiting for 'rdbms ipc message'     wait
6: waiting for 'rdbms ipc message'     wait
7: waiting for 'rdbms ipc message'     wait
8: waiting for 'buffer busy waits' (2,9,11) wait
9: waiting for 'rdbms ipc message'     wait
10: waiting for 'rdbms ipc message'     wait
11: waiting for 'log file switch (archiving needed)' wait
12: waiting for 'rdbms ipc message'     wait
13:
14:
15: waiting for 'log file switch (archiving needed)' wait
16: waiting for 'library cache lock'   [LOCK: handle=20e750ca8] wait
17: waiting for 'rdbms ipc message'     wait
18: waiting for 'rdbms ipc message'     wait
19: waiting for 'buffer busy waits' (2,59,1b) wait
     Cmd: Select
20: waiting for 'log file switch (archiving needed)' wait
21: waiting for 'Streams AQ: qmn coordinator idle wait' wait
22: waiting for 'SQL*Net message from client' wait
23: waiting for 'SQL*Net message from client' wait
24: waiting for 'library cache lock'   [LOCK: handle=20e750ca8] wait
25: waiting for 'buffer busy waits' (1,2ba2,1) wait
26: last wait for 'SQL*Net message from client'
130:waiting for 'SQL*Net message from client' wait
131:waiting for 'SQL*Net message from client' wait
132:waiting for 'SQL*Net message from client' wait
133:waiting for 'SQL*Net message from client' wait
134:waiting for 'SQL*Net message from client' wait
135:waiting for 'SQL*Net message from client' wait
136:waiting for 'SQL*Net message from client' wait
137:waiting for 'SQL*Net message from client' wait
138:waiting for 'SQL*Net message from client' wait
139:waiting for 'SQL*Net message from client' wait
140:waiting for 'SQL*Net message from client' wait
141:waiting for 'SQL*Net message from client' wait
142:waiting for 'SQL*Net message from client' wait
143:waiting for 'SQL*Net message from client' wait
145:waiting for 'Streams AQ: qmn slave idle wait' wait
146:waiting for 'SQL*Net message from client' wait
148:waiting for 'SQL*Net message from client' wait
149:waiting for 'SQL*Net message from client' wait
150:waiting for 'SQL*Net message from client' wait
151:waiting for 'SQL*Net message from client' wait
152:waiting for 'SQL*Net message from client' wait
175:waiting for 'log file switch (archiving needed)' wait
     Cmd: Insert
177:waiting for 'buffer busy waits' (6,ac78b,1) wait
     Cmd: Delete
179:waiting for 'log file switch (archiving needed)' wait
     Cmd: Select
182:waiting for 'log file switch (archiving needed)' wait
     Cmd: Select
184:waiting for 'log file switch (archiving needed)' wait
     Cmd: Select
185:waiting for 'log file switch (archiving needed)' wait
     Cmd: Select
186:waiting for 'log file switch (archiving needed)' wait
     Cmd: Delete
188:waiting for 'log file switch (archiving needed)' wait
     Cmd: Select
195:waiting for 'log file switch (archiving needed)' wait
     Cmd: Select
196:waiting for 'log file switch (archiving needed)' wait
     Cmd: Insert
199:waiting for 'log file switch (archiving needed)' wait
     Cmd: Select
204:waiting for 'log file switch (archiving needed)' wait
     Cmd: Select
205:waiting for 'log file switch (archiving needed)' wait
     Cmd: Select
213:waiting for 'log file switch (archiving needed)' wait
     Cmd: Select
221:waiting for 'log file switch (archiving needed)' wait
     Cmd: Insert
228:waiting for 'log file switch (archiving needed)' wait
     Cmd: Select
232:waiting for 'log file switch (archiving needed)' wait
     Cmd: Select
235:waiting for 'SQL*Net message from client' wait
243:waiting for 'log file switch (archiving needed)' wait
     Cmd: Select
248:waiting for 'SQL*Net message from client' wait
249:waiting for 'SQL*Net message from client' wait
250:waiting for 'SQL*Net message from client' wait
251:waiting for 'SQL*Net message from client' wait
252:waiting for 'log file switch (archiving needed)' wait
253:waiting for 'SQL*Net message from client' wait
254:waiting for 'SQL*Net message from client' wait
255:waiting for 'SQL*Net message from client' wait
259:waiting for 'SQL*Net message from client' wait
260:waiting for 'SQL*Net message from client' wait
262:waiting for 'SQL*Net message from client' wait
263:waiting for 'SQL*Net message from client' wait
264:waiting for 'SQL*Net message from client' wait
265:waiting for 'SQL*Net message from client' wait
266:waiting for 'SQL*Net message from client' wait
267:waiting for 'SQL*Net message from client' wait
268:waiting for 'SQL*Net message from client' wait
269:waiting for 'SQL*Net message from client' wait
270:waiting for 'SQL*Net message from client' wait
273:waiting for 'log file switch (archiving needed)' wait
     Cmd: Insert
Blockers
~~~~~~~~

    Above is a list of all the processes. If they are waiting for a resource
    then it will be given in square brackets. Below is a summary of the
    waited upon resources, together with the holder of that resource.
    Notes:
    ~~~~~
    o A process id of '???' implies that the holder was not found in the
       systemstate.

                    Resource Holder State
      LOCK: handle=20e750ca8    15: waiting for 'log file switch (archiving needed)'

Object Names
~~~~~~~~~~~~
LOCK: handle=20e750ca8    TABL:EXFSYS.RLM$EVTCLEANUP