Database Administrator

GoldenGate update loss Recently, an interesting but disturbing problem was found on the target database of GoldenGate (11.2.1.0.1 for 10g. This is the case. Some users reported that a table in the target database has two fields (DZFAILFLAG, REMARK)

[Instance] in php, the PDO method is used to add, delete, modify, and query databases.You can easily organize and understand the PDO operation instances. Note that you need to enable the pdo support for php. php5.1 and later versions support

Improves SQL query efficiency and SQL Efficiency1. To optimize the query, try to avoid full table scanning. First, consider creating an index on the columns involved in where and order. 2. Try to avoid null value determination on the field in the

MySQL statement execution sequence and MySQL statement execution sequence MySQL statements are divided into 11 steps. As marked, the first FROM operation is always executed, and the last LIMIT operation is executed. Each operation generates a

PowerDesigner15.1 tips 4, powerdesigner15.1 PowerDesigner15.1 tips 4Read first PowerDesigner15.1 tips (1)PowerDesigner15.1 tips (2)-how to find official resourcesPowerDesigner defines cdm, ldm, and pdmThe data structure of a table is represented by

1022, hp1022Today, I used powerdesigner to modify some foreign key relationships. The names of the two foreign keys are the same and I forgot to change them. Then, when running the SQL file with navicat, the error [Err] 1022-Can't write; duplicate

The installation of oracle11g on 64-bit Windows 7 server encounters problems and cannot be deleted. win7oracle11g Today, I have downloaded oracle11g in win7, deleted it, unloaded it, and restarted it four or five times. I will explain the following

MySQL index and advanced usage, MySQL index advanced usage http://tech.meituan.com/mysql-index.html http://www.cnblogs.com/hustcat/archive/2009/10/28/1591648.html http://www.cnblogs.com/mailingfeng/archive/2012/09/26/2704344.html All MySQL column

JDeveloper sets the code prompt (Code assistant) and Code beautification, and jdeveloper Assistant JDeveloper version: 10g jdeveloper with oa extension aru for ebs R12.1.31. Set the automatic code prompt 1.1 Tools-> Preferences-> Code Insight

Oracle Exadata All-in-One and cloud computing applications (2), oracleexadata3. Main Exadata Technologies 3.1 unit shunting In the database cloud server, storage is not just a dumping storage. Storage units are smart enough to handle certain

MySQL database: consolidate the DDL statements, mysqlddl The SQL language includes four major programming languages: Data Definition Language (DDL), data operation language (DML), Data Control Language (DCL), and transaction control language. Data

Oracle uses AWR's SQL ordered by Gets and SQL ordered by Reads to diagnose problems. awrreads I have read many database reports before, and have encountered two serious performance problems recently. They are very representative, so I recorded them.

Database and database LearningConcurrent Control Task Correctly schedule concurrent operationsEnsures transaction isolationEnsure Database Consistency Multi-User Database SystemDatabase systems that can be used by multiple users at the same

Differences between Having and Where, and HavingWhere 1. The where clause is used to remove rows that do not meet the where condition before grouping query results. That is, data is filtered before grouping. The where condition cannot contain

Mongodb study notes, mongodb Summary of Mongodb study notes over the past few days /*** Get login client * @ author xuyw * @ email xyw10000@163.com * @ param host * @ param port * @ return */public static login client getlogin client (String host,

[Mybatis] one-to-one and one-to-many implementations of Mybatis association query. mybatis one-to-one Original works of Lin bingwen Evankaka. Reprinted please indicate the source http://blog.csdn.net/evankaka This article mainly describes how to use

Shmmax, linuxshmmaxThe shmmax Kernel Parameter defines the maximum value of a single shared memory segment allowed by the system.Now the shmmax simulation settings are small:[Root @ localhost kernel] # cat/etc/redhat-releaseRed Hat Enterprise Linux

Modify the default timeout value in phpmyadmin. After logging on to the system, the system automatically exits after being inactive for 1440 seconds. You have to log on multiple times a day. Finally, you have time to solve this problem. It seems

MySQL is upgraded from 5.5 to 5.6, the TIMESTAMP changes, and 5.6 timestampPreface Some time ago, the system MySQL was upgraded from 5.5 to 5.6, and a large number of exceptions occurred. Most of the exceptions are caused by changes in TIMESTAMP

64-bit win7 mysql zip package, win7mysql 1) download the zip package and decompress it. 2) Configure environment variables to the bin directory. For example, your own directory is: F: \ mysql \ mysql-5.6.21-winx64 \ mysql-5.6.21-winx64 \ bin 3)