我正在尝试了解我们正在处理的Java流程问题。这个过程已经在生产中运行了大约4个月,本周早些时候它开始悬挂。当我查看进程的线程转储时,所有相关线程(3)都有如下堆栈:
"TxnParser_1" prio=6 tid=0x69bd3400 nid=0x2534 runnable [0x6aa2f000]
java.lang.Thread.State: RUNNABLE
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at oracle.net.ns.Packet.receive(Unknown Source)
at oracle.net.ns.DataPacket.receive(Unknown Source)
at oracle.net.ns.NetInputStream.getNextPacket(Unknown Source)
at oracle.net.ns.NetInputStream.read(Unknown Source)
at oracle.net.ns.NetInputStream.read(Unknown Source)
at oracle.net.ns.NetInputStream.read(Unknown Source)
at oracle.jdbc.driver.T4CMAREngine.unmarshalUB1(T4CMAREngine.java:1099)
at oracle.jdbc.driver.T4CMAREngine.unmarshalSB1(T4CMAREngine.java:1070)
at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:478)
at oracle.jdbc.driver.T4CStatement.doOall8(T4CStatement.java:207)
at oracle.jdbc.driver.T4CStatement.executeForDescribe(T4CStatement.java:790)
at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1039)
at oracle.jdbc.driver.T4CStatement.executeMaybeDescribe(T4CStatement.java:830)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1132)
at oracle.jdbc.driver.OracleStatement.executeInternal(OracleStatement.java:1687)
at oracle.jdbc.driver.OracleStatement.execute(OracleStatement.java:1653)
- locked <0x40e22f88> (a oracle.jdbc.driver.T4CStatement)
- locked <0x28f8d398> (a oracle.jdbc.driver.T4CConnection)
at com.gcg.data.LogParsingInfo.initFromDB(LogParsingInfo.java:262)
at com.gcg.om.OmQueueEntry.initParseInfoFromDB(OmQueueEntry.java:104)
at com.gcg.om.GenericQueueEntry.run(GenericQueueEntry.java:237)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
没有线程等待锁定,因此进程没有死锁。这些正在完成这项工作的3个线程只是被阻止等待Oracle的响应,至少这对我来说是这样的。
看看Oracle,当我查询v $ session时,看起来与这些线程关联的一个连接当前正在执行查询,尽管我看不到sql。
select ... from v$session where ...;
SQL_ADDRESS SQL_HASH_VALUE SQL_ID SQL_CHILD_NUMBER SQL_EXEC_START SQL_EXEC_ID PREV_SQL_ADDR PREV_HASH_VALUE PREV_SQL_ID PREV_CHILD_NUMBER PREV_EXEC_START PREV_EXEC_ID
---------------- -------------- ------------- ---------------- -------------- ----------- ---------------- --------------- ------------- ----------------- --------------- ------------
00 0 0000000239F59EE8 1483377872 fqr8pndc6p36h 5 26-JUL-12 32080545
00 0 0000000239F59EE8 1483377872 fqr8pndc6p36h 5 26-JUL-12 32080546
0000000148CABD88 1784444892 a16hxxtp5sxyw 0000000239F59EE8 1483377872 fqr8pndc6p36h 5 26-JUL-12 32080544
select * from v$sql where sql_id = 'a16hxxtp5sxyw';
no rows selected
我的问题是:
更新:
根据有关查看DBA_WAITERS和DBA_LOCKS
的评论select * from dba_waiters;
no rows selected
select * from dba_locks where BLOCKING_OTHERS <> 'Not Blocking';
no rows selected
dba_locks中有98行,但由于所有都是'Not Blocking',我不认为这是一个锁定问题?这个过程已经处于这种状态超过3个小时,因此现在已经检测到任何死锁。
我认为Oracle实例不是“健康”的理论,但我不知道该看什么。我有一个请求重启Oracle服务器,但还没有完成。
后续问题:v $ session包含v $ sql中不存在的sql_id是正常的,如果是,在什么条件下?