Oracle GoldenGate 系列：使用 Oracle ASM API DBLOGREADER 时遇
今天在自己新搭建的 Oracle ACFS 文件系统上测试 GoldenGate ，启动 extract 进程报如下错误： 2013-08-27 14:58:39 ERROR OGG-00446 Opening ASM file FRA/rac/archivelog/2013_08_27/thread_1_seq_84.357.824568733 in DBLOGREADER mode: (1031) ORA-01031
今天在自己新搭建的 Oracle ACFS 文件系统上测试 GoldenGate ，启动 extract 进程报如下错误：
2013-08-27 14:58:39 ERROR OGG-00446 Opening ASM file +FRA/rac/archivelog/2013_08_27/thread_1_seq_84.357.824568733 in DBLOGREADER
mode: (1031) ORA-01031: insufficient privileges
Not able to establish initial position for begin time 2013-08-27 14:49:49.
2013-08-27 14:58:39 ERROR OGG-01668 PROCESS ABENDING.
查看 extract 进程参数
GGSCI (rac1.oracle.com) 46> view params escott
EXTRACT escott
SETENV (NLS_LANG=AMERICAN_AMERICA.AL32UTF8)
USERID ggs, PASSWORD register
CACHEMGR, CACHESIZE 128MB
TRANLOGOPTIONS DBLOGREADER
EXTTRAIL ./dirdat/aa
TABLE scott.s_emp;
TABLE scott.s_dept;
Oracle GoldenGate extract 进程访问 asm 中存放的 transaction log 主要有2种方式：
1、以 sys 或 sysdba 权限直接连接 ASM 实例访问
2、在 Oracle 10.2.0.5、Oracle 11.2.0.2 以上版本的数据库中，Oracle 提供了一个新的 asm API ，可以让 extract 进程直接利用
数据库服务器来访问 redo 和 archive log。使用该 API 后，extract 将获得一个最大不超过 4 mb 的read buffer。read buffer 越大
，对于 redo 量较高的 环境越容易提高 Extract 的进程。可以通过使用 TRANLOGOPTIONS 的 DBLOGREADERBUFSIZE 选项来指定
read buffer 的大小。
按照本例中错误的描述，使用 DBLOGREADER API 可能需要某种数据库权限，这里可能正是缺少该权限才导致报错，查阅官方文档发现：
给 ggs 用户授予 select any transaction 后，进程启动正常。
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