本文主要是介绍Oracle Rules Manager 和 Oracle Expression Filter 组件 说明，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
一.Rules Manager 和 Expression Filter 组件说明
在说明之前，我们先用如下SQL查看一下DB中的组件：
SQL> col comp_id for a15
SQL> col version for a15
SQL> col comp_name for a30
SQL> select comp_id,comp_name,versionfrom dba_registry ;
COMP_ID COMP_NAME VERSION
--------------------------------------------- ---------------
XDB Oracle XML Database 11.2.0.3.0
AMD OLAP Catalog 11.2.0.3.0
EM Oracle Enterprise Manager 11.2.0.3.0
SDO Spatial 11.2.0.3.0
ORDIM Oracle Multimedia 11.2.0.3.0
CONTEXT Oracle Text 11.2.0.3.0
ODM Oracle Data Mining 11.2.0.3.0
EXF Oracle Expression Filter 11.2.0.3.0
RUL Oracle Rules Manager 11.2.0.3.0
OWM Oracle Workspace Manager 11.2.0.3.0
CATALOG Oracle Database Catalog Views 11.2.0.3.0
COMP_ID COMP_NAME VERSION
--------------------------------------------- ---------------
CATPROC Oracle Database Packages and T11.2.0.3.0
ypes
JAVAVM JServer JAVA Virtual Machine 11.2.0.3.0
XML Oracle XDK 11.2.0.3.0
CATJAVA Oracle Database Java Packages 11.2.0.3.0
XOQ Oracle OLAP API 11.2.0.3.0
APS OLAP Analytic Workspace 11.2.0.3.0
17 rows selected.
MOS：
Oracle 8i/9i/10g/11g 组件（Components） 说明
http://www.cndba.cn/Dave/article/1445
The 10i newfeature allows you to store conditional expressions as data in the database.The Expression Filter provides a mechanism that you use to place a constrainton a VARCHAR2 column to ensure that the values stored are valid SQL WHEREclause expressions. The mechanism also identifies the set of attributes thatcan be referenced in the conditional expressions.
--Oracle 10g的一个新特性就是允许我们在数据库中用data的方式存储条件表达式。 Expression Filter 组件提供了机制，通过这个机制，我们可以在Varchar2类型的列上添加约束，来确保存储有效的SQL Where 条件表达式。这个机制也可以标记一个属性的集合，其可以用来在条件表达式中参考。
OracleExpression Filter, a feature of Oracle Database 10g, is a component of RulesManager that allows application developers to store, index, and evaluateconditional expressions (expressions) in one or more columns of a relationaltable. Expressions are a useful way to describe interests in expected data.
--Expression Filter 是Rules Manager 的一个组件。其允许研发人员store,index 和 evaluate 条件表达式在相关表的一个或多个列上。
ExpressionFilter matches incoming data with expressions stored in a column to identifyrows of interest. It can also derive complex relationships by matching data inone table with expressions in a second table. Expression Filter simplifies SQLqueries; allows expressions to be inserted, updated, and deleted withoutchanging the application; and enables reuse of conditional expressions in rulesby separating them from the application and storing them in the database.Applications involving information distribution, demand analysis, and taskassignment can benefit from Expression Filter.
--Expression Filter 使用存在列里的表达式来匹配输入的数据。 ExpressionFilter 简化了SQL 查询，允许表达式进行insert，update和delete 操作而不用改变应用程序。
The RulesManager and Expression Filter features are the same in the Standard andEnterprise Editions. Support for indexing expressions is available only in theEnterprise Edition because it requires bitmap index support.
组件用户：
EXFSYS:
Each is suppliedas a set of PL/SQL packages, a Java package, a set of dictionary tables, andcatalog views. All these objects are created in a dedicated schema namedEXFSYS.
官网说明：
OracleExpression Filter Concepts 10gR2
二．组件重建
MOS:
Note 258618.1 - How To Install andUninstall Expression Filter Feature or EXFSYS schema
官网：
Installing Rules Managerand Expression Filter 11gR2
http://docs.oracle.com/cd/E11882_01/appdev.112/e14919/exprn_app_e.htm
2.1 Installing the EXFSYS schema:
1. Login as SYSDBA
2. @?/rdbms/admin/catexf.sql
注意：
1. Installing Expression Filter does notautomatically install Rules Manager.
This component has to be installed separately using thecatrul.sql script
--安装Expression Filter 不会自动安装Rules Manager。所有RulesManager 需要使用catrul.sql 独立安装。
2. When reinstalling Expression Filter, you may have to run utlrp.sql torecompile some invalid objects.
--在卸载Expression Filter 时，需要使用urlrp.sql 来编译一些无效对象。
During installation of OracleDatabase, a demonstration script is installed for both the Rules Manager and Expression Filter features. The scripts ruldemo.sql (Rules Manager demo) andexfdemo.sql (Expression Filter demo) are located in the$ORACLE_HOME/rdbms/demo/ directory.
2.2 Uninstalling the EXFSYS schema:
1. Login as SYSDBA
2. @?/rdbms/admin/catnoexf.sql
注意：
1. Uninstalling Expression Filter implicitly uninstalls Rules Manager.--卸载Expression Filter 组件时会自动卸载Rules Manager 组件。
2. The CATNOEXF.SQL script may not droppublic synonyms created by catexf.sql.
However, with 11.2, it was verified no PUBLIC SYNONYMS fortable_owner = 'EXFSYS' were left.
--catnoexf.sql 脚本不会删除由catexf.sql 产生的公共同义词。但是从Oracle 11gR2 开始，它会验证是否有public sysnonyms的存在。
The followingscript can be used to drop all PUBLIC SYNONYMS created for Rules Manager andExpression Filter when needed:
--如下脚本可以删除所有EXFSYS 用户的PUBLIC SYNONYMS：
declare
cursor cur1 is select synonym_name from all_synonyms where owner ='PUBLIC' and table_owner = 'EXFSYS';
begin
for c1 in cur1 loop
EXECUTE IMMEDIATE 'drop public synonym ' ||dbms_assert.enquote_name(c1.synonym_name, false);
end loop;
end;
/
In someversions before 10.2, or if you do not have the dbms_assert package, thefollowing script can be used instead:
--在Oracle 10gR2 之前，如果没有dbms_assert 包，那么可以使用如下的脚本来删除PUBLIC SYNONYMS：
declare
cursor cur1 is select synonym_name from all_synonyms where owner ='PUBLIC' and table_owner = 'EXFSYS';
begin
for c1 in cur1 loop
EXECUTE IMMEDIATE 'drop public synonym"'||c1.synonym_name||'"';
end loop;
end;
/
Thefollowing is a list of the public synonyms that may remain after justrunning CATNOEXF.SQL and these would be dropped by running one of the abovescripts:
--catanoexf.sql 不能删除的public synonyms列表如下：
EXF$INDEXOPER
EXF$ATTRIBUTE
EXF$ATTRIBUTE_LIST
EXF$TABLE_ALIAS
EXF$XPATH_TAG
EXF$XPATH_TAGS
EVALUATE
DBMS_EXPFIL
USER_EXPFIL_ATTRIBUTE_SETS
ALL_EXPFIL_ATTRIBUTE_SETS
USER_EXPFIL_ATTRIBUTES
ALL_EXPFIL_ATTRIBUTES
USER_EXPFIL_DEF_INDEX_PARAMS
ALL_EXPFIL_DEF_INDEX_PARAMS
USER_EXPFIL_INDEX_PARAMS
ALL_EXPFIL_INDEX_PARAMS
USER_EXPFIL_ASET_FUNCTIONS
ALL_EXPFIL_ASET_FUNCTIONS
USER_EXPFIL_INDEXES
ALL_EXPFIL_INDEXES
USER_EXPFIL_PREDTAB_ATTRIBUTES
ALL_EXPFIL_PREDTAB_ATTRIBUTES
USER_EXPFIL_EXPRESSION_SETS
ALL_EXPFIL_EXPRESSION_SETS
USER_EXPFIL_PRIVILEGES
USER_EXPFIL_EXPRSET_STATS
ALL_EXPFIL_EXPRSET_STATS
RLM$EVENTIDS
RLM$TABLE_ALIAS
DBMS_RLMGR
USER_RLMGR_EVENT_STRUCTS
ALL_RLMGR_EVENT_STRUCTS
USER_RLMGR_RULE_CLASSES
ALL_RLMGR_RULE_CLASSES
USER_RLMGR_RULE_CLASS_STATUS
ALL_RLMGR_RULE_CLASS_STATUS
USER_RLMGR_PRIVILEGES
ADM_RLMGR_PRIVILEGES
USER_RLMGR_COMPRCLS_PROPERTIES
ALL_RLMGR_COMPRCLS_PROPERTIES
USER_RLM4J_EVENT_STRUCTS
USER_RLM4J_RULE_CLASSES
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