问题描述：ogg停止抽取进程停止不下来
GGSCI (ex02db02.iris.cl.sh.cos) 6> stop extu6 Sending STOP request to EXTRACT EXTU6 ... There are open, long-running transactions. Before you stop Extract, make the archives containing data for those transactions available for when Extract restarts. To force Extract to stop, use the SEND EXTRACT EXTU6, FORCESTOP command. Oldest redo log files necessary to restart Extract are: Redo Thread 1, Redo Log Sequence Number 2010, SCN 0.2340216775 (2340216775), RBA 2150464016 Redo Thread 2, Redo Log Sequence Number 3767, SCN 0.2578644069 (2578644069), RBA 3712786960. GGSCI (ex02db02.iris.cl.sh.cos) 7>
分析抽取进程停不下来的原因：
GGSCI (ex02db02.iris.cl.sh.cos) 7> info extu6, showch ---查看抽取进程extu6的具体信息
EXTRACT EXTU6 Last Started 2016-03-30 12:22 Status RUNNING
Checkpoint Lag 00:00:01 (updated 00:00:06 ago)
Log Read Checkpoint Oracle Redo Logs
2016-04-09 07:13:53 Thread 1, Seqno 2164, RBA 1977981456 ------日志1，当前的节点
SCN 0.2578649132 (2578649132)
Log Read Checkpoint Oracle Redo Logs
2016-04-09 07:13:52 Thread 2, Seqno 3767, RBA 3712910848 ------日志2，当前的节点
SCN 0.2578648996 (2578648996)
Current Checkpoint Detail:
Read Checkpoint #1
Oracle Threaded Redo Log
Startup Checkpoint (starting position in the data source):
Thread #: 1
Sequence #: 1438
RBA: 210499600
Timestamp: 2016-03-30 12:22:03.000000
SCN: 0.1566106138 (1566106138)
Redo File: Not Available
Recovery Checkpoint (position of oldest unprocessed transaction in the data source):
Thread #: 1
Sequence #: 2010
RBA: 2150464016
Timestamp: 2016-04-07 10:40:45.000000
SCN: 0.2340216775 (2340216775)
Redo File: Not Available
Current Checkpoint (position of last record read in the data source): -----停止抽取进程的时候，发现Redo Thread 1, Redo Log Sequence Number 2010, SCN 0.2340216775 (2340216775), RBA 2150464016指向了一个比较老的日志点。而当前的日志点在2016-04-09 07:13:53 Thread 1, Seqno 2164, RBA 1977981456，SCN 0.2578649132 (2578649132) ------日志1，当前的节点
Thread #: 1
Sequence #: 2164
RBA: 1977981456
Timestamp: 2016-04-09 07:13:53.000000
SCN: 0.2578649132 (2578649132)
Redo File: +RECO_EX01/oraods/onlinelog/group_3.260.906566199
BR Previous Recovery Checkpoint:
Thread #: 1
Sequence #: 0
RBA: 0
Timestamp: 2016-03-30 12:22:40.228062
SCN: Not available
Redo File:
BR Begin Recovery Checkpoint:
Thread #: 1
Sequence #: 2158
RBA: 601906176
Timestamp: 2016-04-09 04:28:28.000000
SCN: 0.2568814282 (2568814282)
Redo File:
BR End Recovery Checkpoint:
Thread #: 1
Sequence #: 2158
RBA: 601906176
Timestamp: 2016-04-09 04:28:28.000000
SCN: 0.2568814282 (2568814282)
Redo File:
Read Checkpoint #2
Oracle Threaded Redo Log
Startup Checkpoint (starting position in the data source):
Thread #: 2
Sequence #: 2538
RBA: 2046847504
Timestamp: 2016-03-30 12:21:23.000000
SCN: 0.1566051805 (1566051805)
Redo File: Not Available
Recovery Checkpoint (position of oldest unprocessed transaction in the data source):
Thread #: 2
Sequence #: 3767
RBA: 3712910352
Timestamp: 2016-04-09 07:13:52.000000
SCN: 0.2578648996 (2578648996)
Redo File: +RECO_EX01/oraods/onlinelog/group_7.423.906566119
Current Checkpoint (position of last record read in the data source): ---可以看出日志组2，没有什么问题，是指向当前的日志组的。
Thread #: 2
Sequence #: 3767
RBA: 3712910848
Timestamp: 2016-04-09 07:13:52.000000
SCN: 0.2578648996 (2578648996)
Redo File: +RECO_EX01/oraods/onlinelog/group_7.423.906566119
BR Previous Recovery Checkpoint:
Thread #: 2
Sequence #: 0
RBA: 0
Timestamp: 2016-03-30 12:22:40.228062
SCN: Not available
Redo File:
BR Begin Recovery Checkpoint:
Thread #: 2
Sequence #: 3753
RBA: 3358690304
Timestamp: 2016-04-09 04:28:27.000000
SCN: 0.2568813956 (2568813956)
Redo File:
BR End Recovery Checkpoint:
Thread #: 2
Sequence #: 3753
RBA: 3358690304
Timestamp: 2016-04-09 04:28:27.000000
SCN: 0.2568813956 (2568813956)
Redo File:
Write Checkpoint #1
GGS Log Trail
Current Checkpoint (current write position):
Sequence #: 212216
RBA: 11597034
Timestamp: 2016-04-09 07:13:54.176777
Extract Trail: /home/gggate/goldengate/dirdat/e6
Trail Type: EXTTRAIL
Header:
Version = 2
Record Source = A
Type = 11
# Input Checkpoints = 2
# Output Checkpoints = 1
File Information:
Block Size = 2048
Max Blocks = 100
Record Length = 4096
Current Offset = 0
Configuration:
Data Source = 3
Transaction Integrity = 1
Task Type = 0
Status:
Start Time = 2016-03-30 12:22:40
Last Update Time = 2016-04-09 07:13:54
Stop Status = A
Last Result = 0
GGSCI (ex02db02.iris.cl.sh.cos) 8>
处理方法：将抽取进程，修改到当前的日志组，然后再进行停止抽取进程。
通过ggsci>help alter extract -----查看帮助
ALTER EXTRACT extu6, IOEXTSEQNO 2164, IOEXTRBA 0,thread 1