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oracle全文检索的配置

Jun 07, 2016 pm 03:46 PM
oracleFull Text SearchcreatedatabaseConfiguration

在手动创建了数据库后,只是具备了基本的功能,有的还需要使用全文检索功能,因此还需要配置全文检索。 按照以下步骤来做: 1.检查数据库是否具有全文检索功能(这是针对已经建成使用的数据库) 查看用户中是否存在ctxsys用户,查询角色里是否存在ctxapp角色

   在手动创建了数据库后,只是具备了基本的功能,有的还需要使用全文检索功能,因此还需要配置全文检索。

   按照以下步骤来做:

    1.检查数据库是否具有全文检索功能(这是针对已经建成使用的数据库)

        查看用户中是否存在ctxsys用户,查询角色里是否存在ctxapp角色。以上两个中的1个不满足(不存在),则说明没有装过全文检索功能。

      使用contains函数的时候,若没有全文检索则会报错的。

    2.若没有,则需要手动建立,先建立全文检索要使用的空间

             sqlplus / as sysdba  --进入控制台

            create tablespace Idx_ctxsys datafile '/oradata/sg186fx/ctxsys01.dbf size 10240M autoextend on next 32M maxsize 20480M;--创建全文检索使用的表空间

    3.创建全文检索使用的用户和角色及相应的包,则需要执行oracle自带的一个脚本:cd $ORACLE_HOME/ctx/admin/catctx.sql

         还是在sqlplus中执行:

                @?/ctx/admin/catctx.sql ctxsys Idx_ctxsys temp nolock

在执行这个脚本的时候,输入了几个参数,第一个参数ctxsys为ctxsys用户的密码

                                                     第二个参数Idx_ctxsys为ctxsys用户要使用的表空间

                                                      第三个参数temp为ctxsys用户使用的临时表空间

                                                    第四个参数nolock为ctxsys用户处于解锁状态。

   4.创建完成后,要登录ctxsys用户

             connect ctxsys/ctxsys

    执行以下脚本:@?/ctx/admin/defaults/drdefus.sql(这是个很重要的脚本,后面创建索引会使用该脚本创建的信息)

5.创建全文索引语法分析器

               先要明确使用全文索引的用户,我要使用全文索引的是sgpm用户

       因此,grant execute on ctxsys.ctx_ddl to sgpm with grant option;

      connect sgpm/sgpm

      设置语法分析器:exec ctx_ddl.drop_preference('chinalexer');

                             exec ctx_ddl.create_preference('chinalexer','chinese_lexer');

       设置词法属性:exec ctx_ddl.drop_preference('idx_c_store');

                           begin

                                 ctx_ddl.create_preference('idx_c_store','BASIC_STORAGE');

                                  ctx_ddl.set_attribut('idx_c_store','I_TABLE_CLAUSE','tablespaces  Idx_ctxsy');

                                  ctx_ddl.set_attribute('idx_c_store','I_INDEX_CLAUSE','tablespace  Idx_ctxsy compress 2');

                          end;

                         /

     6.创建索引

           create index sgpm.idx_c_cons_name on sgpm.c_cons(cons_name) indextype is ctxsys.context parameters('lexer chinalexer storage idx_c_store');

     7.同步索引

         variable jobno number;

         begin

             dbms_job.submit(:jobno,'pkg_sp_tools.p_cont_sys_index();',sysdate,'trunc(sysdate)+19/24+1');  --执行的是个性化方法。

         end;

        /

   普通的就是用: exec ctx_ddl.sync_index('idx_c_cons_name');

到此,全文检索创建成功,contains函数就可以正常使用了。

注意:创建的过程中会出现ORA-29879:cannot create multiple domain index on a column listusing same indextype ,这说明在其他用户下已经建立了该索引。

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