本文链接：https://blog.csdn.net/guogang83/article/details/78800487
[[email protected] ~]$nohup expdp gg/gg directory=gg_DB dumpfile=gg_20171212_%u.dmp logfile=gg_zc_20171212.log parallel=4 job_name=exp_gg_20171212 filesize=20g cluster=no compression=DATA_ONLY &
...................................................
Estimate in progress using BLOCKS method...
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
导出一直卡在这里。
1.刚开始以为是ESTIMATE的问题，ESTIMATE默认是BLOCKS 。
ESTIMATE 计算作业估计值。
有效的关键字值为: [BLOCKS] 和 STATISTICS。
于是把调整了一下，ESTIMATE=STATISTICS，结果还是卡住。
2.回归这个问题，那就要找到它到底在做什么，怎么看呢？
select s.EVENT,s.MODULE,s.PROGRAM from gv$session s where s.PROGRAM like ‘%(DW%‘;(也可以查MODULE=Data Pump Worker)
看到了有行锁enq: TX - contention,
3.查下谁堵塞了它，kill session，可以导出了。
SELECT bs.INST_ID,
bs.username "Blocking User",
bs.username "DB User",
bs.SID "SID",
bs.serial# "Serial#",
bs.sql_address "address",
bs.sql_hash_value "Sql hash",
bs.program "Blocking App",
bs.machine "Blocking Machine",
bs.osuser "Blocking OS User",
bs.serial# "Serial#",
ws.username "Waiting User",
ws.SID "WSID",
ws.program "Waiting App",
ws.machine "Waiting Machine",
ws.osuser "Waiting OS User",
ws.serial# "WSerial#",
wk.TYPE lock_type,
hk.lmode mode_held,
wk.request mode_requested,
TO_CHAR(hk.id1) lock_id1,
TO_CHAR(hk.id2) lock_id2,
hk.BLOCK blocking_others
FROM gv$lock hk, gv$session bs, gv$lock wk, gv$session ws
WHERE hk.BLOCK = 1
AND hk.lmode != 0
AND hk.lmode != 1
AND wk.request != 0
AND wk.TYPE(+) = hk.TYPE
AND wk.id1(+) = hk.id1
AND wk.id2(+) = hk.id2
AND hk.SID = bs.SID(+)
AND wk.SID = ws.SID(+)
AND (bs.username IS NOT NULL)
AND (bs.username <> ‘SYSTEM‘)
AND (bs.username <> ‘SYS‘)
ORDER BY 1;
原文地址：https://www.cnblogs.com/lcword/p/11779617.html