ogg是逻辑同步，不想ADG利用后镜像直接修改block中的内容，ogg是根据redo片中SQL，以及SQL对应的后镜像值进行表的修改，这样如果大表上面没有索引，或者走错索引就会导致同步慢。但是OGG都是单表update，所以很容易优化SQL。以下利用sql profile固定执行计划，清除sharedpool对应的执行计划达到重新利用正常的执行计划

-bash-3.2$ ogg

Oracle GoldenGate Command Interpreter for Oracle

Version 11.2.1.0.6 16211226 OGGCORE_11.2.1.0.6_PLATFORMS_130418.1829_FBO

Solaris, sparc, 64bit (optimized), Oracle 11g on Apr 22 2013 15:23:39

GGSCI (ODSDB) 1> info all

Program Status Group Lag at Chkpt Time Since Chkpt

MANAGER RUNNING

JAGENT STOPPED

REPLICAT RUNNING RP10 00:00:00 00:00:03

REPLICAT RUNNING RP7 00:00:06 00:00:03

REPLICAT RUNNING RPS1 42:41:14 00:00:01

REPLICAT RUNNING RPS2 00:00:00 00:00:10

REPLICAT RUNNING RPS2A 00:00:00 00:00:00

REPLICAT RUNNING RPS2B 00:00:00 00:00:00

REPLICAT RUNNING RPS3 00:00:00 00:00:02

REPLICAT RUNNING RPS3A 00:00:00 00:00:03

REPLICAT RUNNING RPS3B 00:00:00 00:00:02

REPLICAT RUNNING RPS4 00:00:00 00:00:07

REPLICAT RUNNING RPS4A 00:00:00 00:00:07

REPLICAT RUNNING RPS4B 00:00:00 00:00:07

REPLICAT RUNNING RPS4C 00:00:00 00:00:07

REPLICAT RUNNING RPS4D 00:00:00 00:00:08

REPLICAT RUNNING RPS4E 00:00:00 00:00:07

REPLICAT RUNNING RPS4F 00:00:00 00:00:07

REPLICAT RUNNING RPS4G 00:00:00 00:00:07

REPLICAT RUNNING RPS4H 00:00:00 00:00:07

REPLICAT RUNNING RPS4I 00:00:00 00:00:08

REPLICAT RUNNING RPS4J 00:00:00 00:00:07

跟他去了终端旁边，发现确实有个rps1进程延迟有点高。看着进程状态是RUNNING，但是根据我维护六年ogg来看，有可能是假象，那么怎么判断呢？

1，查看ggserr.log

2，查看dirrpt下面该进程的dsc文件

3，info 进程名多次，看看RBA是否有变化

经过以上几步rps1进程状态是正常的，延迟高问题出在哪里？view params rps1看到该进程只有一张表。那我们看看这个进程到底卡在哪里了

SQL> !ps -ef |grep rps1 |grep -v grep

orao 12169 11012 0 Jun 07 ? 614:58 /odogg/baseogg/replicat PARAMFILE /odsogg/baseogg/dirprm/rps1.prm REPORTFILE /

SQL> !ps -ef |grep 12169 |grep -v grep

orao 12170 12169 1 Jun 07 ? 2315:30 oracleodb (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))

orao 12169 11012 0 Jun 07 ? 614:58 /odogg/baseogg/replicat PARAMFILE /odsogg/baseogg/dirprm/rps1.prm REPORTFILE /

SQL> select s.sid,s.SERIAL#,sql_id from v$process p,v$session s where p.addr=s.paddr and p.spid=12170;

SID SERIAL# SQL_ID

---------- ---------- -------------

5146 113 5099dwmx3s4mf

SQL> /

SID SERIAL# SQL_ID

---------- ---------- -------------

5146 113 dzubcf8jm69yx

SQL> /

SID SERIAL# SQL_ID

---------- ---------- -------------

5146 113 dzubcf8jm69yx

SQL> /

SID SERIAL# SQL_ID

---------- ---------- -------------

5146 113 dzubcf8jm69yx

询问了一下维护过该系统的同事，说是不是统计信息太旧。顺着思路往下走走

SQL> select OWNER,TABLE_NAME,LAST_ANALYZED from dba_tables where table_name='TF_F_USER_REVGRPTAG';

OWNER TABLE_NAME LAST_ANALYZED

-------------------------------------------------------------------------------

TTT TF_F_USER_REXXX 2017-06-26 00:20:56

SQL> select table_name,num_rows from dba_tables where owner='TTT' and table_name='TF_F_USER_REXXX';

TABLE_NAME NUM_ROWS

------------------------------ ----------

TF_F_USER_REXXX 409269832

SQL> select count(*) from TTT.TF_F_USER_REXXX;

COUNT(*)

----------

409955510

接下来我们看看该sql执行计划是不是走错了？

两条执行计划，很明显137632316运行了5400次但是执行时间却远远高于第二个执行计划。

用sql profile绑定一下执行计划

SQL> @coe_xfr_sql_profile.sql

Parameter 1:

SQL_ID (required)

Enter value for 1: dzubcf8jm69yx

PLAN_HASH_VALUE AVG_ET_SECS

--------------- -----------

2320424968 .004

137632316 21.119

Parameter 2:

PLAN_HASH_VALUE (required)

Enter value for 2: 2320424968

Values passed to coe_xfr_sql_profile:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

SQL_ID : "dzubcf8jm69yx"

PLAN_HASH_VALUE: "2320424968"

查看是否绑定成功

SQL>select name from dba_sql_profiles;

NAME

------------------------------

coe_dzubcf8jm69yx_2320424968

SYS_SQLPROF_015d075ccdd40000

coe_a5hgtqfq09tcu_229988255

在将内存中的该sql语句清除出去

SQL>select address,hash_value,executions,parse_calls from v$sql where sql_TEXT like 'UPDATE "TTT"."TF_F_USER_RExxxx" SET "PARTITION_ID" = :a27,"USER_ID" = :a28%';

ADDRESS HASH_VALUE EXECUTIONS PARSE_CALLS

---------------- ---------- ---------- -----------

00000017673EA5E8 4198240878 100 0

00000017CF3E0000 897328139 673 0

00000017982D40D0 1588244011 8 0

000000049D04B1A8 590555101 10 0

00000017AA525230 4271852353 2 0

0000001777FC6A20 3666847391 735 0

00000017B9154A58 1180290247 1 0

7 rows selected.

SQL>alter session set events '5614566 trace name context forever';

Session altered.

SQL>exec dbms_shared_pool.purge('00000017673EA5E8,4198240878','C');