oracle資料庫誤刪恢複方法,oracle資料庫誤刪一.如果只是誤刪部分資料或者某條資料可以通過1、select * from 誤刪除的表明 as of timestamp to_Date('恢複年月日 時分秒', '恢復格式') where 查詢條件; 如:select * from emp as of timestamp
oracle啟動報錯ORA-00845: MEMORY_TARGET not supported on this system解決辦法,memorytargetoracle啟動報錯ORA-00845: MEMORY_TARGET not supported on this system原因可能:ORACLE MEMORY_TARGET參數設定超過了oracle伺服器本身記憶體、或超過了現在伺服器空閑記憶體(就是oracle啟動時無法擷取設定的記憶體) eg: oracle
sql進位之間的轉換,sql進位轉換-----二進位轉換十進位-----------------select sum(data1)from ( select substring('11011', number, 1)*power(2,len('11011')-number)data1 from (select number from master.dbo.spt_values where type='p')K
Message 1070 not found; No message file for product=network, facility=TNSTNSLSNR for Linux: Version,facilitytnstnslsnr接到一個朋友打來的求助電話,在安裝oracle11g單機版的時候建立監聽報錯如下:Message 1070 not found; No message file for product=network, facility=TNSTNSLSNR for Linux:
資料庫索引,資料庫索引原理索引是對資料庫表中一個或多個列(例如,employee 表的姓氏 (lname) 列)的值進行排序的結構。如果想按特定職員的姓來尋找他或她,則與在表中搜尋所有的行相比,索引有助於更快地擷取資訊。資料庫索引採用的是B+樹,如果查詢兩個表的內容:select * from a, b where a.id =
血的教訓---ogg一定要用最新的版本,血的教訓---ogg要用This could be a Bug 19517566 - IE EXTRACT ABEND WITH OGG-01161 BAD COLUMN INDEX relating to the extract where the extract was still resolving the old metadata and having the excluded column as a part of the key column.
關於環境變數 ORACLE_SID 簡單談下,環境變數oracle_sid[oracle10g@lixora ~]$ export ORACLE_SID=12323[oracle10g@lixora ~]$ !sqlsqlplus / as sysdbaSQL*Plus: Release 10.2.0.1.0 - Production on Thu Nov 6 02:24:04 2014Copyright (c) 1982, 2005, Oracle. All rights
mysql如何做order by,mysqlorderbyORDER BY ClausesIn general, the optimizer will skip the sort procedure for the ORDER BY clause if it sees that the rowswill be in order anyway. But let's examine some exceptional situations.For the query:SELECT column1