link:http://www.eygle.com/case/sql_trace_2.htm問題說明:很多時候在我們進行數(shù)據(jù)庫操作時比如drop user,drop table等，經(jīng)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(xiàn)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(guān)于 recursive SQL 錯誤我們有必要做個簡單說明.我們知道，當我們發(fā)出一條簡單的命令以后 Oracle數(shù)據(jù)庫要在后臺解析這條命令，并轉(zhuǎn)換為Oracle數(shù)據(jù)庫的一系列后臺操作.這些后臺操作統(tǒng)稱為遞歸sql比如create table這樣一條簡單的DDL命令Oracle數(shù)據(jù)庫在后臺，實際上要把這個命令轉(zhuǎn)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(shù)據(jù)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(xiàn)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(jù)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(chuàng)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(jié)使用sql_trace可以跟蹤數(shù)據(jù)庫的很多后臺操作有利于我們發(fā)現(xiàn)問題的所在很多時候，我們想要研究Oracle的內(nèi)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.