Database Administrator

Oracle uses sqluldr2 to export data Sqluldr2 isThe OCI-based text export tool is small and convenient. It is similar to the exp provided by Oracle and supports exporting custom SQL statements, local data, and client data. It is fast and efficient.At

MySQL conversion table Engine There are many ways to convert the table storage engine into another engine. Each method has its own advantages and disadvantages. Here we will introduce four methods: Select the priority (pt-online-schema-change>

14 pictures understand what blockchain technology is, 14 pictures understand Blocks The block chain technology was initially designed to solve the problem of the "Byzantine General". The development of financial technology gave the block chain

The PreparedStatement in JDBC is used to obtain the automatically generated primary key value of the database, PreparedStatement Interface public interface PreparedStatementExtends Statement Indicates the objects of pre-compiled SQL

User Interface access time limit using redis, redis times Assume that a user (determined by IP address) cannot access a service interface more than 10 times per minute. Import org. apache. commons. lang3.StringUtils; import org. slf4j. logger;

Probably the most powerful jdbc DBManager in history, jdbcdbmanager Package com. lb. util; import java. SQL. connection; import java. SQL. driverManager; import java. SQL. preparedStatement; import java. SQL. resultSet; import java. SQL.

C # Learning 05 -- IndexOf,Use of IndexOf () Example: Find the specified string String str = "loolloolol"; int index = 0; // index int count = 0; // number of times string keyword = "ol"; // specify the string if (index You can define a string

SQL beginners often have a headache for left join and right join. In fact, you don't have to memorize it. Just write an SQL statement and it will be finished. Use SQL to verify the result each time you want, and then use it again. It takes a long

For data export, import. Exp/imp can be used to import remote data to the client. However, expdp/impdp is not powerful.Expdp/impdp is powerful, but the exported data can only be on the server. Next we will use the expdp and dblinkExport data to a

Package donghongyu. tk. news. util; import java. io. file; import java. io. fileInputStream; import java. io. IOException; import java. io. inputStream; import java. SQL. connection; import java. SQL. driverManager; import java. SQL. resultSet;

When Oracle reads the discontinuous Buffer of memory (PGA or Buffer Cache) from multiple data files in parallel, this waiting event can be seen. This kind of wait event also occurs when the restoration operation or preprocessing buffering (instead

The following statement is enabled in SQLPLUS.Commonly used: SQL> set timing on -- control display execution time statistics. Note that set time on is displayed before the SQL prompt. SQL> SET AUTOTRACE OFF -- no AUTOTRACE report is generated.

Agent often encounters various problems during upload. Common methods are to clean up logs or secure.A script is compiled. This script applies to the single-host and RAC environments.Configure the environment variable AGENT_HOME. #! /Bin/bash $

When xmanager is used for oracle installation in a linux Chinese operating system, garbled interface may appear. You can solve this problem by using the following methods: 1. Modify the environment attribute vi/etc/sysconfig/i18n LANG = "en_US.UTF-8

MYSQL advanced applicationI. Transaction Processing and locking1. storage engine provided by mysql)MyISAM's default high-speed engine does not support Transaction ProcessingInnoDB supports row locking and transaction processing, which is slower than

Ibatis , dynamic attributes and #, $ applications correct useIbatis, as a semi-automated OR Mapping tool, is becoming more and more people tend to use it in projects. Because SQL statements often conflict with xml specifications, the validity of xml

With the release of the iPhone 5S, Everyone began to care about the 64-bit CPU A7 used on the 5S.In addition to the performance of A7, you will also be concerned about whether the 64-bit System Using A7 has any requirements for applications.

# For advice on how to change settings please see # Http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html # *** Do not edit this file. It's a template which will be copied to # *** Default location during install, and will be

When working overtime at night to call a remote copy of The local Mysql storage process, The error is: [Err] 1449-The user specified as a definer ('admin _ isbox' @ 'localhost') does not exist Based on the common root @ localhost error, assign all

The ASM instance has many special parameters. We recommend that the ASM instance use spfile instead of the initialization parameter file. For example, when adding or deleting a disk group, the asm_diskgroups parameter will be automatically