instantclient-basic-linux.x64-12.2.0.1.0.zip、 
instantclient-sdk-linux.x64-12.2.0.1.0.zip、 
instantclient-sqlplus-linux.x64-12.2.0.1.0.zip三个文件包
#解压缩，并修改目录为instantclient
mv instantclient_12_2 instantclient
下载地址(永久有效):
链接：https://pan.baidu.com/s/1qxLyMKUBnrjL960TGzMcZg 
提取码：6pb9

2 在root和gpadmin用户下配置环境变量(主节点)

2.1 配置环境变量

export ORACLE_HOME=/data/instantclient export OCI_LIB_DIR=$ORACLE_HOME export OCI_INC_DIR=$ORACLE_HOME/sdk/include export LD_LIBRARY_PATH=$ORACLE_HOME:$LD_LIBRARY_PATH

2.2 建立软连接

进入到$ORACLE_HOME 目录下执行
ln -s libclntsh.so.12.1 libclntsh.so

2.3 修改权限

把文件的权限给gpadmin用户
chown -R gpadmin:gpadmin /data/instantclient

3 下载编译oracle_fdw(主节点)

https://github.com/adam8157/oracle_fdw_greenplum

4 编译(主节点)

#  make
报错如下：这里的意思是没有初始化事务隔离级别，那么需要修改源码

[root@mdw oracle_fdw_greenplum-master]# vi oracle_utils.c

*oracleGetSession(const char *connectstring, oraIsoLevel isolation_level, char *user, char *password, const char *nls_lang, const char *tablename, int curlevel) { OCIEnv *envhp = NULL; OCIError *errhp = NULL; OCISvcCtx *svchp = NULL; OCIServer *srvhp = NULL; OCISession *userhp = NULL; OCITrans *txnhp = NULL; oracleSession *session; struct envEntry *envp; struct srvEntry *srvp; struct connEntry *connp; char pid[30], *nlscopy = NULL; ub4 is_connected; int retry = 1; ub4 isolevel = OCI_TRANS_NEW;//修改事务隔离级别，否则报错未初始化 /* convert isolation_level to Oracle OCI value */ switch(isolation_level) { case ORA_TRANS_SERIALIZABLE: isolevel = OCI_TRANS_SERIALIZABLE; break; case ORA_TRANS_READ_COMMITTED: isolevel = OCI_TRANS_NEW; break; case ORA_TRANS_READ_ONLY: isolevel = OCI_TRANS_READONLY; break; }

[root@mdw oracle_fdw_greenplum-master]# make
gcc -Wall -Wmissing-prototypes -Wpointer-arith -Wendif-labels -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv -fexcess-precision=standard -fno-aggressive-loop-optimizations -Wno-unused-but-set-variable -Wno-address -O3 -std=gnu99 -Werror=uninitialized -Werror=implicit-function-declaration -fPIC -shared -o oracle_fdw.so oracle_fdw.o oracle_utils.o oracle_gis.o -L/usr/local/greenplum-db-6.5.0/lib -Wl,--as-needed -Wl,-rpath,'/usr/local/greenplum-db-6.5.0/lib',--enable-new-dtags -L/data/instantclient -L/data/instantclient/bin -L/data/instantclient/lib -L/data/instantclient/lib/amd64 -lclntsh -L/usr/lib/oracle/19.6/client/lib -L/usr/lib/oracle/19.6/client64/lib -L/usr/lib/oracle/19.3/client/lib -L/usr/lib/oracle/19.3/client64/lib -L/usr/lib/oracle/18.5/client/lib -L/usr/lib/oracle/18.5/client64/lib -L/usr/lib/oracle/18.3/client/lib -L/usr/lib/oracle/18.3/client64/lib -L/usr/lib/oracle/12.2/client/lib -L/usr/lib/oracle/12.2/client64/lib -L/usr/lib/oracle/12.1/client/lib -L/usr/lib/oracle/12.1/client64/lib -L/usr/lib/oracle/11.2/client/lib -L/usr/lib/oracle/11.2/client64/lib -L/usr/lib/oracle/11.1/client/lib -L/usr/lib/oracle/11.1/client64/lib -L/usr/lib/oracle/10.2.0.5/client/lib -L/usr/lib/oracle/10.2.0.5/client64/lib -L/usr/lib/oracle/10.2.0.4/client/lib -L/usr/lib/oracle/10.2.0.4/client64/lib -L/usr/lib/oracle/10.2.0.3/client/lib -L/usr/lib/oracle/10.2.0.3/client64/lib
 [root@mdw oracle_fdw_greenplum-master]# make install
/usr/bin/mkdir -p '/usr/local/greenplum-db-6.5.0/lib/postgresql'
/usr/bin/mkdir -p '/usr/local/greenplum-db-6.5.0/share/postgresql/extension'
/usr/bin/mkdir -p '/usr/local/greenplum-db-6.5.0/share/postgresql/extension'
/usr/bin/mkdir -p '/usr/local/greenplum-db-6.5.0/share/doc/postgresql/extension'
/usr/bin/install -c -m 755 oracle_fdw.so '/usr/local/greenplum-db-6.5.0/lib/postgresql/oracle_fdw.so'
/usr/bin/install -c -m 644 oracle_fdw.control '/usr/local/greenplum-db-6.5.0/share/postgresql/extension/'
/usr/bin/install -c -m 644 oracle_fdw--1.2.sql oracle_fdw--1.0--1.1.sql oracle_fdw--1.1--1.2.sql '/usr/local/greenplum-db-6.5.0/share/postgresql/extension/'
/usr/bin/install -c -m 644 README.oracle_fdw '/usr/local/greenplum-db-6.5.0/share/doc/postgresql/extension/'

5 复制编译文件到所有节点

将主节点/usr/local/greenplum-db-6.5.0/lib/postgresql/oracle_fdw.so放到所有节点相应目录下
将主节点/usr/local/greenplum-db-6.5.0/share/postgresql/extension下的所有oracle_fdw相关的文件放到所有节点相应目录下

6 分发oracle客户端到所有节点

1、用gpadmin用户把 /data/instantclient 发送到其他的segment节点上的相同目录下

2、并把master节点上的环境变量发送到其他的segment的节点上

7 动态连接库增加oracle客户端地址(所有节点执行)

所有节点执行下列操作：
# 每个节点加入oracle客户端的库路径（root用户），让pg
# cd /etc/ld.so.conf.d/
# vi oracle-x86_64.conf
/data/instantclient
# ldconfig
注:如果不执行上述步骤，在create extension时会报错：

8 创建oracle_fdw并测试结果(主节点)

postgres=# create extension oracle_fdw;
CREATE EXTENSION

#创建名称为oradb 的oracle_fdw

postgres=# CREATE SERVER oradb FOREIGN DATA WRAPPER oracle_fdw OPTIONS (dbserver '//172.30.78.2:1521/amrdb');
CREATE SERVER

#为用户gpadmin创建基于oradb的mapping

postgres=# CREATE USER MAPPING FOR gpadmin SERVER oradb OPTIONS (user 'amr', password 'amr');
CREATE USER MAPPING

#创建外部表，其中schema 'AMR', table 'T_FDW'为oracle的用户名和表名

postgres=# CREATE FOREIGN TABLE t_fdw_ora(id int)SERVER oradb OPTIONS (schema 'AMR', table 'T_FDW');
CREATE FOREIGN TABLE
#测试连接成功
postgres=# select * from t_fdw_ora;
 id 
----
 1

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