Database Administrator

1. set key Add version 1.0.0. Time Complexity: O (1 ). Maps the key and value. If the key already exists, it will be overwritten, regardless of its type.Return Value Status Code: Always OK, because SET will not fail. 2. get key Add version 1.0.

The DECODE function is equivalent to a Condition Statement (IF). It compares the input value with the parameter list in the function and returns a corresponding value based on the input value. The parameter list of a function is a sequence of

SQL server 2005 has been installed on one server, and everything is normal. Recently, due to the use of table type parameters, sqlserver 2008 needs to be installed, but cannot be connected after installation. The local machine can be connected

1. Questions about database RestorationHttp://bbs.csdn.net/topics/390699019The following error occurs when you restore the. bak file:Error: 3205 too many devices are specified for backup or restoration. Only 64 devices are allowed.The restore

I encountered this exception when I reviewed C # connecting to the SQL SERVER database today. Exceptions are not thrown in try catch. Is an exception in the object when the SqlConnection object is created. See:After careful check, the database

Today, my colleague said that a machine had a power outage during the holidays. After the machine was restarted, I logged on to the server using PLSQL: A ORA-01034: ORACLE not availableORA-27101: shared memory realm does not existLinux_x86_64 Error:

[Oracle @ slave ~] $ Cat/etc/sysconfig/i18nLANG = "zh_CN.UTF-8"[Oracle @ slave ~] $ Echo $ LANGZh_CN.UTF-8[Oracle @ slave ~] $ Echo $ NLS_LANG [Oracle @ slave ~] $ Sqlplus/nolog SQL * Plus: Release 11.1.0.6.0-Production on Sat Oct 30 13:24:10

How to export empty tables in oracle 11g Due to the new features created by the delay segments of oracle 11g, oracle does not allocate data segments when no data is inserted. In this case, exp cannot export empty tables of the 11g Database. Of

The last article in the Sesame Series introduced how to add Triple Data. This article describes how to export Triple Data to a file.1. Establish a database connection static NativeStore nativeStore;static Repository repo;static String

It has been many years since VLINK introduced the concept of being idle and finished the DEMO. I did not expect that Chao and Zhong still insisted on updating the DEMO. I sent a link to his latest version, in the future, we will go to him to urge

There are two ways to load hibernate, one is get loading, the other is load loading, the load is delayed loading, and the dynamic proxy is used. This is not our concern. Let's take a look at the characteristics of one-to-one bidirectional

Zookeeper Host restart -- RAC cannot be started:1: storage is out of order.Ocr voting/etc/udev/rules. d/60-raw.rules Check CSS logs 2. Check whether the private network is faulty.PingCluvfy Frequent interruption of RAC access:Local_listenerIp

Zookeeper Linux commands for deleting files and folders When using this rm-rf to delete files, you must be extremely careful that there is no recycle bin in linux.You can simply use rm, but add the parameter-f, that is, the rm-f file path.-F means

The database design mainly describes the structure and design of some databases, mainly for all internal staff, internal departments, project teams, designated personnel of the company. The following is my document on database design. 1

Zookeeper From the author's website data analysis: data-driven website management, optimization and operation: http://item.jd.com/11295690.html Arithmetic mean analysis is to use the calculation mean method to reflect the general level of a certain

I recently spent some time learning Redis and recorded the entire process for future study. What is Redis? on the official website, Redis is completely open-source and free. It complies with the BSD Protocol and is an advanced key-value persistence

ACCESS stores readable data and easy data migration. We use it as a backup file for small data to facilitate the import and export of various databases. Address:Http://blog.csdn.net/chen_zw/article/details/18896259 Local ODBC Data Source

In the past, when using relational databases, we could not access data without a user name or password. However, in MongDB, you can access the database without the user name or password by default and perform various operations. This is not safe for

MySQL replication is asynchronous, that is, non-synchronous. It does not verify data consistency in the database, as long as the SQL syntax is correct and there is no error, it can be successfully executed. MASTER@root@test 12:20:40>create table

VoltDB, known as the world's fastest Relational Database Service, released the next-generation database version January 29, 2014 in 4.0 (US east time. The new version has many improvements, greatly improving system performance. In the past 13 years,