Oracle與MySQL字串拼接一、MySQL在Java中我們通常用加號"+"來實現字串的拼接,MySQL中也可以使用"+"來實現,比如:先加入測試資料CREATE TABLE test( id INT, name VARCHAR(10), score FLOAT );INSERT INTO test VALUES(1,'zhang',98);INSERT
MySQL InnoDB儲存引擎之鎖,mysqlinnodb 概念: 鎖是用來管理對共用檔案的並發訪問。innodb會在行層級上對資料庫上鎖。不過innodb儲存引擎會在資料庫內部其他多個地方使用鎖,從而允許對不同資源提供並發訪問。例如操作緩衝池中的LRU列表,刪除,添加,移動LRU列表中的元素,為了保證一致性,必須有鎖的介入。MyISAM引擎是表鎖,而InnoDB提供一致性的非鎖定讀、
【oracle】oracledba9 Rename the read-only data file to their correct file names.,oraclerenameOne of the tablespace is read-only in your database. The los s of all control file&
關於db版本升級之後ogg版本也升級時,配置DDL複製時指令碼的問題,oggddl關於db版本升級之後ogg版本也升級的問題。首先說明,此處的db版本升級是10.2.0.5升級到11.2.0.3,因此屬於 major version 的變化。什麼叫做 major version呢?mos文章Oracle Database End of Premier Support For Major Releases - Frequently Asked Questions (Doc ID 1559513.1
【EBS】打中文patch6678700報錯小記,EBS12.1.1在打patch6678700中文補丁時報錯如下:ATTENTION: All workers either have failed or are waiting:FAILED: file XLIFFLoader.class on worker ....ATTENTION: Please&nb
Mysql高效能之Memcached(2),mysqlmemcached本文將介紹在部署Memcached中需要注意的問題以及Memcached的分布式演算法無論你是新上線的系統還是已經上線很久的系統。我們都可以很簡單的對Memcached進行配置,但是配置之前我們需要注意如下問題:1.memcached is only a caching mechanism. It shouldn't be used to store information that you cannototherwise
Mysql高效能之Memcached(1),mysqlmemcached本文將介紹Memcached的安裝與使用What is Memcached?Free & open source, high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by
Character set 'utf8mb4' is not a compiled character set,utf8mb4compiled 最近在一次MySQL資料移轉的過程中遭遇了字元集的問題,提示為"Character set 'utf8mb4' is not a compiled character