在已建好的table上添加primary key1.建立索引create index test_idx on test(id);2.添加約束alter table testadd constraint test_pk primary key (id)using index test_idx;
在SQLPLUS中登陸時出現以下錯誤ERROR:ORA-12638: Credential retrieval failed解決方法:修改sqlnet.ora如果SQLNET.AUTHENTICATION_SERVICES= (NTS)一行沒有被註釋,則註釋掉#SQLNET.AUTHENTICATION_SERVICES= (NTS)反之取消註釋
ALTER SYSTEM SET EVENTS='10231 trace name context forever,level 10' ; 內部事件，設置在全表掃瞄時跳過損壞的數據塊.
查看tablespace的空間使用情況select a.tablespace_name, trunc(sum(b.bytes/1024/1024),2) "FREE(M)", trunc(sum(a.bytes/1024/1024)-sum(b.bytes/1024/1024),2) "USED(M)", trunc(sum(a.bytes/1024/1024),2) "ALL(M)", trunc(sum(b.bytes/1024/1024)/sum(a.bytes/1024/1024),2)*100||'%' "Free(%)"from dba_data_files ajoin dba_free_space b on(a.file_id=b.file_id)group by a.tablespace_name;如何指定tnsname.ora的位置設置環境變量TNS_ADMIN
獲取當前SCN(9i以後)select dbms_flashback.get_system_change_number from dual;
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