Oracle將目標資料庫設為歸檔模式應該注意的問題1、串連到sysdbaSQL> conn /as sysdba2、查看執行個體是否為歸檔SQL> select dbid,name,log_mode from v$database;3、設定歸檔參數SQL> alter system set log_archive_dest = '/oracle/product/database/archive'
The VM for Linux prefers system cache over application memory. What does this mean? The best way I can explain is by example.Imagine you have 32 GB of RAMMySQL is set to take 20 GB of RAM for a process based buffer and up to 6M for the various
MySQL建立使用者並設定存取控制許可權文法:GRANT ALL PRIVILEGES ON *.* TO 'username'@'%' IDENTIFIED BY 'password' WITH GRANT OPTION;說明:1、"*.*"是設定此使用者對資料庫和表的控制。例如設定此使用者可以控制mysql庫的user表,那麼就應該寫成"mysql.user"。2、"%"是設定此使用者允許訪問的主機。3、"username"訪問資料庫的使用者。4、"password"訪問資料庫的密碼。
Nulls first和nulls last是Oracle Order by支援的文法如果Order by 中指定了運算式Nulls first則表示null值的記錄將排在最前(不管是asc 還是 desc)如果Order by 中指定了運算式Nulls last則表示null值的記錄將排在最後 (不管是asc 還是 desc)使用文法如下:--將nulls始終放在最前select * from zl_cbqc order by cb_ld nulls
今天看到一ocp的題有點疑問,就做了個小實驗,碰到了ORA-02097、ORA-00837兩個錯誤;題如下: Q484. You set the following parameters in the parameter fileand restarted the database:MEMORY_MAX_TARGET=0MEMORY_TARGET=500MPGA_AGGREGATE_TARGET=90MSGA_TARGET=270MWhich two statements are
開發同事說使用postgres的擴充行轉列應用時有一個問題,樣本如下該擴充包初步使用參考:一、環境 OS:CentOS 6.3 DB:PostgreSQL 9.3.0二、情境create table t(day date,equipment varchar(20),output integer);insert into t values('2010-04-01','DAT501',100);insert into t
執行srvctl時報錯[Oracle@rac01 bin]$ srvctl/u01/app/oracle/product/10.2.0/db_1/jdk/jre/bin/java: error while loading shared libraries: libpthread.so.0: cannot open shared object file: No such file or directorysrvctl無法啟動要解決上面的問題 1,編輯 rac01,rac02下的