link:http://www.eygle.com/case/sql_trace_2.htm問題說明:很多時候在我們進行數據庫操作時比如drop user,drop table等，經常會碰到這樣的錯誤 ORA-00604: error occurred at recursive SQL level 1 . 這樣的提示，很多時候是沒有絲毫用處的.本案例就這一類問題提供一個思路及方法供大家參考.1. drop user出現問題報出以下錯誤后退出ORA-00604: error occurred at recursive SQL level 1 ORA-00942: table or view does not exist .關于 recursive SQL 錯誤我們有必要做個簡單說明.我們知道，當我們發出一條簡單的命令以后 Oracle數據庫要在后臺解析這條命令，并轉換為Oracle數據庫的一系列后臺操作.這些后臺操作統稱為遞歸sql比如create table這樣一條簡單的DDL命令Oracle數據庫在后臺，實際上要把這個命令轉換為對于obj$,tab$,col$等底層表的插入操作.Oracle所作的工作可能比我們有時候想的要復雜的多. 2.跟蹤問題我們知道Oracle提供sql_trace的功能可以用于跟蹤Oracle數據庫的后臺遞歸操作.通過跟蹤文件，我們可以找到問題的所在以下是格式化(tkprof)后的輸出:********************************************************************************The following statement encountered a error during parse:DELETE FROM SDO_GEOM_METADATA_TABLE WHERE SDO_OWNER = 'WAPCOMM' Error encountered: ORA-00942********************************************************************************Oracle把錯誤信息首先呈現出來我們看到ORA-00942錯誤是由于SDO_GEOM_METADATA_TABLE表/視圖不存在所致問題由此可以定位對于這一類的錯誤，定位問題以后解決的方法就要依據具體問題原因而定了。3.問題定位對于本案例，通過Metalink獲得以下解釋:Problem Description ------------------- The Oracle Spatial Option has been installed and you are encountering the following errors while trying to drop a user, who has no spatial tables, connected as SYSTEM: ERROR at line 1: ORA-00604: error occurred at recursive SQL level 1 ORA-00942: table or view does not exist ORA-06512: at line 7 A 942 error trace shows the failing SQL statement as: DELETE FROM SDO_GEOM_METADATA_TABLE WHERE SDO_OWNER = '<user>' Solution Description -------------------- (1) Create a synonym for SDO_GEOM_METADATA_TABLE under SYSTEM which points to MDSYS.SDO_GEOM_METADATA_TABLE. 對于本例，為MDSYS.SDO_GEOM_METADATA_TABLE創建一個同義詞即可解決.是相對簡單的情況.(2) Now the user can be dropped connected as SYSTEM. Related Documents ----------------- <Note.159776.1> ORA-604 and ORA-942 Reported During DROP USER CASCA4.實際處理MDSYS.SDO_GEOM_METADATA_TABLE為Spatial對象假如未使用Spatial選項，可以刪除 SQL> connect / as sysdbaConnected. SQL> select * from dba_sdo_geom_metadata order by owner; select * from dba_sdo_geom_metadata order by owner*ERROR at line 1:ORA-00942: table or view does not existORA-04063: view 'MDSYS.DBA_SDO_GEOM_METADATA' has errorsSQL> select object_name from dba_objects where object_name like '%SDO%';OBJECT_NAME--------------------------------------------------------------------------------ALL_SDO_GEOM_METADATAALL_SDO_INDEX_INFOALL_SDO_INDEX_METADATADBA_SDO_GEOM_METADATADBA_SDO_INDEX_INFODBA_SDO_INDEX_METADATA....DBA_SDO_GEOM_METADATADBA_SDO_INDEX_INFO...SDO_WITHIN_DISTANCEUSER_SDO_GEOM_METADATAUSER_SDO_INDEX_INFOUSER_SDO_INDEX_METADATA88 rows selected.SQL> drop user MDSYS cascade;User dropped.SQL> select owner,type_name from dba_types where type_name like 'SDO%';no rows selectedSQL> SQL> alter session set sql_trace=true;Session altered.SQL> drop user wapcomm;User dropped.SQL> alter session set sql_trace=false;Session altered.SQL> exitDisconnected from Oracle8i Enterprise Edition Release 8.1.7.4.0 - 64bit ProdUCtionWith the Partitioning optionJServer Release 8.1.7.4.0 - 64bit Production這時用戶得以順利drop5.一點總結使用sql_trace可以跟蹤數據庫的很多后臺操作有利于我們發現問題的所在很多時候，我們想要研究Oracle的內部活動或后臺操作也可以通過sql_trace跟蹤sql_trace/10046 是Oracle提供的最為有效的診斷工具之一.