在已建好的table上添加primary key 1.建立索引 create index test_idx on test(id); 2.添加約束 alter table test add constraint test_pk primary key (id) using index test_idx;
ALTER SYSTEM SET EVENTS=''''10231 trace name context forever,level 10'''' ; 内部事件,设置在全表扫描时跳过损坏的数据块.
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 a join 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;