热门搜索:
您现在的位置是：首页 > 文章详情

OceanBase Oracle 模式下系统视图权限导致的故障一例

日期：2023-10-18点击：77

在 Oracle 和 OB Oracle 租户下调用存储过程时，两者表现并不一致，导致获取到的 SQL 文本拼接不完整，影响到了业务侧的功能测试。本文将针对这个问题进行相关的测试和验证。

作者：赵黎明，爱可生 MySQL DBA 团队成员，熟悉 Oracle、MySQL 等数据库，擅长数据库性能问题诊断、事务与锁问题的分析等，负责处理客户 MySQL 及我司自研 DMP 平台日常运维中的问题，对开源数据库相关技术非常感兴趣。

爱可生开源社区出品，原创内容未经授权不得随意使用，转载请联系小编并注明来源。

本文约 3100 字，预计阅读需要 10 分钟。

背景

最近在客户这边遇到一个故障，在 Oracle 和 OB Oracle 租户下调用存储过程时，两者表现并不一致，导致获取到的 SQL 文本拼接不完整，影响到了业务侧的功能测试。

客户的存储过程逻辑并不复杂，就是通过查询系统视图 user_tab_columns 来获取用户的表名，然后再进行 SQL 拼接，完成后续的业务逻辑。

本文将针对这个问题进行相关的测试和验证。

问题复现

Oracle 环境中验证

-- 创建测试用户并赋权 [root@localhost ~]# sqlplus / as sysdba SQL> create user u1 identified by u1; User created. SQL> create user u2 identified by u2; User created. SQL> grant connect,resource to u1; Grant succeeded. SQL> grant create procedure to u1; Grant succeeded. SQL> grant connect,resource to u2; Grant succeeded. SQL> grant create synonym to u2; Grant succeeded. SQL> grant select any table to u2; Grant succeeded. -- 创建测试表并赋权 SQL> conn u1/u1 Connected. SQL> create table t1(id int); Table created. SQL> insert into t1(id) values(1); 1 row created. -- 创建表的同义词 SQL> conn u2/u2 Connected. SQL> create synonym t1 for u1.t1; Synonym created. SQL> set lin 200 SQL> col owner for a5 SQL> col table_owner for a5 SQL> col db_link for a10 SQL> select * from all_synonyms where owner='U2'; OWNER SYNONYM_NAME TABLE TABLE_NAME DB_LINK ----- ------------------------------ ----- ------------------------------ ---------- U2 T1 U1 T1 -- 创建存储过程并赋权 SQL> conn u1/u1 Connected. SQL> create or replace procedure proc_case1 as v_str varchar2(10); begin select table_name into v_str from user_tab_columns where table_name='T1'; dbms_output.put_line(v_str); end; / 2 3 4 5 6 7 Procedure created. SQL> grant execute on proc_case1 to u2; Grant succeeded. -- 创建存储过程同义词 SQL> conn u2/u2 Connected. SQL> create synonym proc_case1 for u1.proc_case1; Synonym created. SQL> select * from all_synonyms where owner='U2'; OWNER SYNONYM_NAME TABLE TABLE_NAME DB_LINK ----- ------------------------------ ----- ------------------------------ ---------- U2 PROC_CASE1 U1 PROC_CASE1 U2 T1 U1 T1 -- 验证 SQL> conn u1/u1 Connected. SQL> select * from t1; ID ---------- 1 SQL> set serveroutput on; SQL> call proc_case1(); T1 Call completed. SQL> conn u2/u2 Connected. SQL> select * from t1; ID ---------- 1 SQL> set serveroutput on; SQL> call proc_case1(); T1 Call completed. SQL>

由此可见，在 Oracle 中，无论是 u1 还是 u2 用户，调用存储过程时都能正确返回表名，说明两者查询 user_tab_columns 视图的返回结果是一致的，这也是符合预期的。

OB Oracle 环境中验证

-- 创建测试用户并赋权 SYS[SYS]> create user u1 identified by u1; Query OK, 0 rows affected (0.04 sec) SYS[SYS]> create user u2 identified by u2; Query OK, 0 rows affected (0.04 sec) SYS[SYS]> grant connect,resource to u1; Query OK, 0 rows affected (0.04 sec) SYS[SYS]> grant create procedure to u1; Query OK, 0 rows affected (0.03 sec) SYS[SYS]> grant connect,resource to u2; Query OK, 0 rows affected (0.05 sec) SYS[SYS]> grant create synonym to u2; Query OK, 0 rows affected (0.03 sec) SYS[SYS]> grant select any table to u2; Query OK, 0 rows affected (0.03 sec) -- 创建测试表并赋权 SYS[SYS]> conn u1 Connection id: 269006 Current database: U1 SYS[U1]> create table t1(id int); Query OK, 0 rows affected (0.21 sec) SYS[U1]> insert into t1(id) values(1); Query OK, 1 row affected (0.03 sec) SYS[U1]> commit; Query OK, 0 rows affected (0.01 sec) -- 创建表的同义词 SYS[U1]> conn u2 Connection id: 50837 Current database: U2 SYS[U2]> create synonym t1 for u1.t1; Query OK, 0 rows affected (0.05 sec) SYS[U2]> select * from all_synonyms where owner='U2'; +-------+--------------+-------------+------------+---------+ | OWNER | SYNONYM_NAME | TABLE_OWNER | TABLE_NAME | DB_LINK | +-------+--------------+-------------+------------+---------+ | U2 | T1 | U1 | T1 | NULL | +-------+--------------+-------------+------------+---------+ 2 rows in set (0.01 sec) -- 创建存储过程并赋权 SYS[U2]> conn u1 Connection id: 269078 Current database: U1 SYS[U1]> create or replace procedure proc_case1 as -> v_str varchar2(10); -> begin -> select table_name into v_str from user_tab_columns where table_name='T1'; -> dbms_output.put_line(v_str); -> end; -> / Query OK, 0 rows affected (0.17 sec) SYS[U1]> grant execute on proc_case1 to u2; Query OK, 0 rows affected (0.06 sec) -- 创建存储过程同义词 SYS[U1]> conn u2 Connection id: 50896 Current database: U2 SYS[U2]> create synonym proc_case1 for u1.proc_case1; Query OK, 0 rows affected (0.05 sec) SYS[U2]> select * from all_synonyms where owner='U2'; +-------+--------------+-------------+------------+---------+ | OWNER | SYNONYM_NAME | TABLE_OWNER | TABLE_NAME | DB_LINK | +-------+--------------+-------------+------------+---------+ | U2 | PROC_CASE1 | U1 | PROC_CASE1 | NULL | | U2 | T1 | U1 | T1 | NULL | +-------+--------------+-------------+------------+---------+ 2 rows in set (0.01 sec) -- 验证 SYS[U2]> conn u1 Connection id: 269134 Current database: U1 SYS[U1]> select * from t1; +------+ | ID | +------+ | 1 | +------+ 1 row in set (0.01sec) SYS[U1]> set serveroutput on; Query OK, 0 rows affected (0.41 sec) SYS[U1]> call proc_case1(); Query OK, 0 rows affected (0.21 sec) SYS[U1]> select table_name,column_name from user_tab_columns; +------------+-------------+ | TABLE_NAME | COLUMN_NAME | +------------+-------------+ | C | NAME | | C | ADDRESS | +------------+-------------+ 2 rows in set (0.08 sec)

此处其实已经可以发现一些端倪，在 OB 中虽然可以通过 conn 进行用户切换，切换后的用户也能访问自己的对象，但是在访问 USER_ 等视图时，返回结果与 Oracle 不同。

用户 u1 查询 user_tab_columns 表时，只能看到 SYS 用户下的表（ C 表是由 SYS 用户创建的），所以存储过程无法返回 T1 表的表名，其查询结果为空。

-- 直连 u1 用户验证 U1[U1]> select * from t1; +------+ | ID | +------+ | 1 | +------+ 1 row in set (0.01sec) U1[U1]> set serveroutput on; Query OK, 0 rows affected (0.02sec) U1[U1]> call proc_case1(); Query OK, 0 rows affected (0.08sec) T1 U1[U1]> -- 直连 u2 用户进行验证 U2[U2]> select * from t1; +------+ | ID | +------+ | 1 | +------+ 1 row in set (0.03sec) U2[U2]> set serveroutput on; Query OK, 0 rows affected (0.44 sec) U2[U2]> call proc_case1(); Query OK, 0 rows affected (0.43 sec) U2[U2]> select * from user_tab_columns; Empty set (0.08 sec) # 同样地，u2 也无法从 user_tab_columns 视图中查询到 u1 创建的表，调用存储过程返回结果为空 -- 将 user_tab_columns 替换成 all_tab_columns 视图 U2[U2]> select table_name,column_name from all_tab_columns where owner='U1'; +------------+-------------+ | TABLE_NAME | COLUMN_NAME | +------------+-------------+ | T1 | ID | +------------+-------------+ 1 row in set (0.08 sec) U2[U2]> create or replace procedure proc_case2 as -> v_str varchar2(10); -> begin -> select table_name into v_str from all_tab_columns where table_name='T1' and owner='U1'; -> dbms_output.put_line(v_str); -> end; -> / Query OK, 0 rows affected (0.17ec) U2[U2]> call proc_case2(); Query OK, 0 rows affected (0.16ec) T1 U2[U2]> -- 将 SELECT ANY TABLE 权限回收 SYS[SYS]> revoke select any table from u2; Query OK, 0 rows affected (0.03 sec) U2[U2]> select table_name,column_name from all_tab_columns where owner='U1'; Empty set (0.05 sec) U2[U2]> set serveroutput on; Query OK, 0 rows affected (0.01 sec) U2[U2]> call proc_case2(); Query OK, 0 rows affected (0.05 sec)

当用户 u2 没有 SELECT ANY TABLE 系统权限后，即使查询 all_tab_columns 视图，也无法获取其他用户创建表的相关信息。

排查调用系统视图的相关对象

PL 对象

PL 对象，如：函数，存储过程等。

 -- dba_source 视图中存放了各种 PL 对象的定义 SQL> select count(*),type from dba_source group by type; COUNT(*) TYPE ---------- ------------ 152202 PROCEDURE 89318 PACKAGE 31504 PACKAGE BODY 1276 TYPE BODY 2210 TRIGGER 3895 FUNCTION 7 JAVA SOURCE 12338 TYPE 8 rows selected. -- 创建测试存储过程（大小写各1个） SQL> CREATE OR REPLACE PROCEDURE PROC_1 IS V_N NUMBER :=0; BEGIN SELECT COUNT(*) INTO V_N FROM USER_TAB_COLUMNS; END; / 2 3 4 5 6 Procedure created. SQL> create or replace procedure proc_2 is v_n number :=0; begin select count(*) into v_n from user_tab_columns; end; / 2 3 4 5 6 Procedure created. -- 查询常用系统视图名（此处只列举了几个与表相关的视图） select owner,object_name,object_type from dba_objects where owner='SYS' and (object_name like 'USER_PART_%' or object_name like 'USER_T%' or object_name like 'ALL_PART_%' or object_name like 'ALL_T%' or object_name like 'DBA_PART_%' or object_name like 'DBA_T%'); -- 根据上一步获取到的系统视图名，通过模糊搜索，即可捕获到涉及查询这些系统视图的 PL 对象 SQL> set line 200 pages 9999 long 999999 SQL> col owner for a10 SQL> col name for a30 SQL> col text for a80 SQL> select owner,name,type,text from dba_source where owner not in('SYS', 'SYSTEM', 'SYSMAN', 'OUTLN', 'DIP', 'TSMSYS', 'DBSNMP', 'ORACLE_OCM', 'WMSYS', 'EXFSYS', 'XDB', 'ANONYMOUS', 'ORDSYS', 'ORDPLUGINS', 'SI_INFORMTN_SCHEMA', 'MDSYS', 'MGMT_VIEW', 'PERFSTAT', 'DMSYS', 'CTXSYS', 'OLAPSYS', 'MDDATA', 'APPQOSSYS', 'XS$NULL', 'ORDDATA', 'SPATIAL_WFS_ADMIN_USR', 'SPATIAL_CSW_ADMIN_USR', 'OWBSYS', 'APEX_PUBLIC_USER', 'APEX_030200', 'FLOWS_FILES', 'SCOTT', 'OMS', 'OWBSYS_AUDIT', 'DSG', 'DBMGR', 'PATROL', 'SPA', 'GOLDENGATE', 'DBADM') and owner not like 'MYNET%' and (text like '%USER_TAB_COLUMNS%' or text like '%user_tab_columns%' or text like '%USER%TABLES%' or text like '%user%tables%' or text like '%ALL_TAB_COLUMNS%' or text like '%ALL_tab_columns%' or text like '%ALL%TABLES%' or text like '%ALL%tables%'); 2 3 4 5 6 7 8 OWNER NAME TYPE TEXT ---------- ------------------------------ ------------ -------------------------------------------------------------------------------- U1 PROC_CASE1 PROCEDURE select table_name into v_str from user_tab_columns where table_name='T1'; ZLM PROC_1 PROCEDURE SELECT COUNT(*) INTO V_N FROM USER_TAB_COLUMNS; ZLM PROC_2 PROCEDURE select count(*) into v_n from user_tab_columns;

视图对象

 -- 创建测试视图1 SQL> create view view_1 as select * from user_tables; View created. -- 查询 dba_views 获取视图定义 SQL> select owner,view_name,text from dba_views where owner not in('SYS', 'SYSTEM', 'SYSMAN', 'OUTLN', 'DIP', 'TSMSYS', 'DBSNMP', 'ORACLE_OCM', 'WMSYS', 'EXFSYS', 'XDB', 'ANONYMOUS', 'ORDSYS', 'ORDPLUGINS', 'SI_INFORMTN_SCHEMA', 'MDSYS', 'MGMT_VIEW', 'PERFSTAT', 'DMSYS', 'CTXSYS', 'OLAPSYS', 'MDDATA', 'APPQOSSYS', 'XS$NULL', 'ORDDATA', 'SPATIAL_WFS_ADMIN_USR', 'SPATIAL_CSW_ADMIN_USR', 'OWBSYS', 'APEX_PUBLIC_USER', 'APEX_030200', 'FLOWS_FILES', 'SCOTT', 'OMS', 'OWBSYS_AUDIT', 'DSG', 'DBMGR', 'PATROL', 'SPA', 'GOLDENGATE', 'DBADM') and (text like '%USER_TAB_COLUMNS%' or text like '%user_tab_columns%' or text like '%USER%TABLES%' or text like '%user%tables%' or text like '%ALL_TAB_COLUMNS%' or text like '%ALL_tab_columns%' or text like '%ALL%TABLES%' or text like '%ALL%tables%'); 2 3 4 5 6 7 8 'DBADM') and (text like '%USER_TAB_COLUMNS%' or text like '%user_tab_columns%' or text like '%USER%TABLES%' or text like '%user%tables%' or text like '%ALL_TAB_COLUMNS%' or text like '%ALL_tab_columns%' or text like '%ALL%TABLES%' or text like '%ALL%tables%') * ERROR at line 8: ORA-00932: inconsistent datatypes: expected NUMBER got LONG

  • dba_source 视图中的 text 列是 varchar2 类型的，可以直接使用 like 进行模糊查询。

  • dba_views 视图中的 text 列是 long 类型的，无法直接使用 like 进行模糊查询，会报 ORA-00932 的错误。

workaround：先创建一张表，用 to_lob 函数将 text 字段转换为 clob 类型，然后将 dba_views 拷贝到该表中，再通过以上 SQL 进行查询。

-- 创建中间表并将系统视图 dba_views 内容拷贝到该表 SQL> create table my_views as select owner,view_name,to_lob(text) text from dba_views; Table created. -- 查询中间表捕获目标视图对象 SQL> select owner,view_name,text from my_views where owner not in('SYS', 'SYSTEM', 'SYSMAN', 'OUTLN', 'DIP', 'TSMSYS', 'DBSNMP', 'ORACLE_OCM', 'WMSYS', 'EXFSYS', 'XDB', 'ANONYMOUS', 'ORDSYS', 'ORDPLUGINS', 'SI_INFORMTN_SCHEMA', 'MDSYS', 'MGMT_VIEW', 'PERFSTAT', 'DMSYS', 'CTXSYS', 'OLAPSYS', 'MDDATA', 'APPQOSSYS', 'XS$NULL', 'ORDDATA', 'SPATIAL_WFS_ADMIN_USR', 'SPATIAL_CSW_ADMIN_USR', 'OWBSYS', 'APEX_PUBLIC_USER', 'APEX_030200', 'FLOWS_FILES', 'SCOTT', 'OMS', 'OWBSYS_AUDIT', 'DSG', 'DBMGR', 'PATROL', 'SPA', 'GOLDENGATE', 'DBADM') and (text like '%USER_TAB_COLUMNS%' or text like '%user_tab_columns%' or text like '%USER%TABLES%' or text like '%user%tables%' or text like '%ALL_TAB_COLUMNS%' or text like '%ALL_tab_columns%' or text like '%ALL%TABLES%' or text like '%ALL%tables%'); 2 3 4 5 6 7 8 OWNER VIEW_NAME TEXT---------- ------------------------------ -------------------------------------------------------------------------------- ZLM VIEW_1 select "TABLE_NAME","TABLESPACE_NAME","CLUSTER_NAME","IOT_NAME","STATUS","PCT_FR EE","PCT_USED","INI_TRANS","MAX_TRANS","INITIAL_EXTENT","NEXT_EXTENT","MIN_EXTEN TS","MAX_EXTENTS","PCT_INCREASE","FREELISTS","FREELIST_GROUPS","LOGGING","BACKED _UP","NUM_ROWS","BLOCKS","EMPTY_BLOCKS","AVG_SPACE","CHAIN_CNT","AVG_ROW_LEN","A VG_SPACE_FREELIST_BLOCKS","NUM_FREELIST_BLOCKS","DEGREE","INSTANCES","CACHE","TA BLE_LOCK","SAMPLE_SIZE","LAST_ANALYZED","PARTITIONED","IOT_TYPE","TEMPORARY","SE CONDARY","NESTED","BUFFER_POOL","ROW_MOVEMENT","GLOBAL_STATS","USER_STATS","DURA TION","SKIP_CORRUPT","MONITORING","CLUSTER_OWNER","DEPENDENCIES","COMPRESSION"," DROPPED" from user_tables

该方法可以满足需求，但每次有新的视图被创建时，需要 drop 并重建表，比较繁琐。

workaround：创建物化视图来代替中间表。

-- 创建物化视图 SQL> create materialized view my_mviews refresh force on demand start with sysdate next sysdate + 10 /(24*60) as select owner,view_name,to_lob(text) text from dba_views; 2 3 4 5 6 7 Materialized view created. -- 创建测试视图2 SQL> CREATE VIEW VIEW_2 AS SELECT * FROM USER_TABLES; View created. -- 查看是否捕获到 view_2 视图 SQL> select owner,view_name,text from my_mviews where owner not in('SYS', 'SYSTEM', 'SYSMAN', 'OUTLN', 'DIP', 'TSMSYS', 'DBSNMP', 'ORACLE_OCM', 'WMSYS', 'EXFSYS', 'XDB', 'ANONYMOUS', 'ORDSYS', 'ORDPLUGINS', 'SI_INFORMTN_SCHEMA', 'MDSYS', 'MGMT_VIEW', 'PERFSTAT', 'DMSYS', 'CTXSYS', 'OLAPSYS', 'MDDATA', 'APPQOSSYS', 'XS$NULL', 'ORDDATA', 'SPATIAL_WFS_ADMIN_USR', 'SPATIAL_CSW_ADMIN_USR', 'OWBSYS', 'APEX_PUBLIC_USER', 'APEX_030200', 'FLOWS_FILES', 'SCOTT', 'OMS', 'OWBSYS_AUDIT', 'DSG', 'DBMGR', 'PATROL', 'SPA', 'GOLDENGATE', 'DBADM') and (text like '%USER_TAB_COLUMNS%' or text like '%user_tab_columns%' or text like '%USER%TABLES%' or text like '%user%tables%' or text like '%ALL_TAB_COLUMNS%' or text like '%ALL_tab_columns%' or text like '%ALL%TABLES%' or text like '%ALL%tables%'); 2 3 4 5 6 7 8 OWNER VIEW_NAME TEXT ---------- ------------------------------ -------------------------------------------------------------------------------- ZLM VIEW_1 select "TABLE_NAME","TABLESPACE_NAME","CLUSTER_NAME","IOT_NAME","STATUS","PCT_FR EE","PCT_USED","INI_TRANS","MAX_TRANS","INITIAL_EXTENT","NEXT_EXTENT","MIN_EXTEN TS","MAX_EXTENTS","PCT_INCREASE","FREELISTS","FREELIST_GROUPS","LOGGING","BACKED _UP","NUM_ROWS","BLOCKS","EMPTY_BLOCKS","AVG_SPACE","CHAIN_CNT","AVG_ROW_LEN","A VG_SPACE_FREELIST_BLOCKS","NUM_FREELIST_BLOCKS","DEGREE","INSTANCES","CACHE","TA BLE_LOCK","SAMPLE_SIZE","LAST_ANALYZED","PARTITIONED","IOT_TYPE","TEMPORARY","SE CONDARY","NESTED","BUFFER_POOL","ROW_MOVEMENT","GLOBAL_STATS","USER_STATS","DURA TION","SKIP_CORRUPT","MONITORING","CLUSTER_OWNER","DEPENDENCIES","COMPRESSION"," DROPPED" from user_tables -- 查看物化视图刷新时间 SQL> select owner,mview_name,last_refresh_type,last_refresh_date from user_mviews; OWNER MVIEW_NAME LAST_REF LAST_REFRESH_DATE ---------- ------------------------------ -------- ------------------- ZLM MY_MVIEWS COMPLETE 2023-08-03 16:07:15 -- 手动刷新物化视图 SQL> exec dbms_mview.refresh('my_mviews'); PL/SQL procedure successfully completed. SQL> select owner,mview_name,last_refresh_type,last_refresh_date from user_mviews; OWNER MVIEW_NAME LAST_REF LAST_REFRESH_DATE ---------- ------------------------------ -------- ------------------- ZLM MY_MVIEWS COMPLETE 2023-08-03 16:21:45 -- 再次查询物化视图，此时 view_2 也能被捕获到了，这样就无需重复建表，当有新视图被创建的时候，只需手动刷新物化视图即可 SQL> select owner,view_name,text from my_mviews where owner not in('SYS', 'SYSTEM', 'SYSMAN', 'OUTLN', 'DIP', 'TSMSYS', 'DBSNMP', 'ORACLE_OCM', 'WMSYS', 'EXFSYS', 'XDB', 'ANONYMOUS', 'ORDSYS', 'ORDPLUGINS', 'SI_INFORMTN_SCHEMA', 'MDSYS', 'MGMT_VIEW', 'PERFSTAT', 'DMSYS', 'CTXSYS', 'OLAPSYS', 'MDDATA', 'APPQOSSYS', 'XS$NULL', 'ORDDATA', 'SPATIAL_WFS_ADMIN_USR', 'SPATIAL_CSW_ADMIN_USR', 'OWBSYS', 'APEX_PUBLIC_USER', 'APEX_030200', 'FLOWS_FILES', 'SCOTT', 'OMS', 'OWBSYS_AUDIT', 'DSG', 'DBMGR', 'PATROL', 'SPA', 'GOLDENGATE', 'DBADM') and (text like '%USER_TAB_COLUMNS%' or text like '%user_tab_columns%' or text like '%USER%TABLES%' or text like '%user%tables%' or text like '%ALL_TAB_COLUMNS%' or text like '%ALL_tab_columns%' or text like '%ALL%TABLES%' or text like '%ALL%tables%'); 2 3 4 5 6 7 8 OWNER VIEW_NAME TEXT ---------- ------------------------------ -------------------------------------------------------------------------------- ZLM VIEW_1 select "TABLE_NAME","TABLESPACE_NAME","CLUSTER_NAME","IOT_NAME","STATUS","PCT_FR EE","PCT_USED","INI_TRANS","MAX_TRANS","INITIAL_EXTENT","NEXT_EXTENT","MIN_EXTEN TS","MAX_EXTENTS","PCT_INCREASE","FREELISTS","FREELIST_GROUPS","LOGGING","BACKED _UP","NUM_ROWS","BLOCKS","EMPTY_BLOCKS","AVG_SPACE","CHAIN_CNT","AVG_ROW_LEN","A VG_SPACE_FREELIST_BLOCKS","NUM_FREELIST_BLOCKS","DEGREE","INSTANCES","CACHE","TA BLE_LOCK","SAMPLE_SIZE","LAST_ANALYZED","PARTITIONED","IOT_TYPE","TEMPORARY","SE CONDARY","NESTED","BUFFER_POOL","ROW_MOVEMENT","GLOBAL_STATS","USER_STATS","DURA TION","SKIP_CORRUPT","MONITORING","CLUSTER_OWNER","DEPENDENCIES","COMPRESSION"," DROPPED" from user_tables ZLM VIEW_2 select "TABLE_NAME","TABLESPACE_NAME","CLUSTER_NAME","IOT_NAME","STATUS","PCT_FR EE","PCT_USED","INI_TRANS","MAX_TRANS","INITIAL_EXTENT","NEXT_EXTENT","MIN_EXTEN TS","MAX_EXTENTS","PCT_INCREASE","FREELISTS","FREELIST_GROUPS","LOGGING","BACKED _UP","NUM_ROWS","BLOCKS","EMPTY_BLOCKS","AVG_SPACE","CHAIN_CNT","AVG_ROW_LEN","A VG_SPACE_FREELIST_BLOCKS","NUM_FREELIST_BLOCKS","DEGREE","INSTANCES","CACHE","TA BLE_LOCK","SAMPLE_SIZE","LAST_ANALYZED","PARTITIONED","IOT_TYPE","TEMPORARY","SE CONDARY","NESTED","BUFFER_POOL","ROW_MOVEMENT","GLOBAL_STATS","USER_STATS","DURA TION","SKIP_CORRUPT","MONITORING","CLUSTER_OWNER","DEPENDENCIES","COMPRESSION"," DROPPED" from USER_TABLES

解决方案

将存储过程中的 user_tab_columns 视图替换成 all_tab_columns，虽然可作为临时方案，不过存在以下缺点：

  1. 需要修改业务代码，即替换存储过程中查询相关系统视图的部分。
  2. 使用同义词来访问对象的用户，需要有 SELECT ANY TABLE 的系统权限，否则即便使用 all_ 的视图，也查询不到目标对象。
  3. 赋予执行用户 dba 权限，并修改原有查询 SQL，增加 owner='XXX' 的条件（存在安全隐患，不推荐）。
  4. OB 能提供一个 hotfix patch 来彻底解决该问题。

问题总结

在 OB 中，普通用户查询 USER_TAB_COLUMNS 系统视图权限的逻辑与 Oracle 并不一致，导致查询结果有差异。

除了 USER_TAB_COLUMNS 视图，还有其他以 USER_ 开头的视图，也存在类似的问题，比如：USER_SYNONYMS、USER_TABLES 等。

对于系统中已有的对象，应尽快排查并确认在哪些对象中用到了这些系统视图，在该问题被彻底修复前，建议先对相关代码进行临时修改，使其能继续完成后续的功能验证。

更多技术文章，请访问：https://opensource.actionsky.com/

关于 SQLE

爱可生开源社区的 SQLE 是一款面向数据库使用者和管理者，支持多场景审核，支持标准化上线流程，原生支持 MySQL 审核且数据库类型可扩展的 SQL 审核工具。

SQLE 获取

类型 地址
版本库 https://github.com/actiontech/sqle
文档 https://actiontech.github.io/sqle-docs/
发布信息 https://github.com/actiontech/sqle/releases
数据审核插件开发文档 https://actiontech.github.io/sqle-docs/docs/dev-manual/plugins/howtouse
原文链接：https://my.oschina.net/actiontechoss/blog/10120128
关注公众号

低调大师中文资讯倾力打造互联网数据资讯、行业资源、电子商务、移动互联网、网络营销平台。

持续更新报道IT业界、互联网、市场资讯、驱动更新,是最及时权威的产业资讯及硬件资讯报道平台。

转载内容版权归作者及来源网站所有，本站原创内容转载请注明来源。

相关文章

    文章评论

    共有0条评论来说两句吧...

    文章二维码

    扫描即可查看该文章

    点击排行

    推荐阅读

    最新文章