NAV: SLTechnology News&Howtos > Database >

• 

  Which is faster in Oracle: count (1), count (*) or count (primary key)?

  After listening to nearly 20 speeches in the past two days, I feel that I have gained a lot. The deepest feeling is that I still have a long way to go. There are a few points to record: yesterday, I heard from the old cat that a common problem mentioned was that count (*), count (1) and count (primary key) in Oracle

  2022-06-01 14:55:48 Views: 293
• 

  Download, install, configure and use MySQL under Windows

  After using MySQL, regardless of capacity, I found that it was much easier to use than the other two (sql server and oracle), and I fell in love with it at once. The following is to write down the specific methods and steps for those children's shoes who do not know how to get them. (I wrote this in a little too much detail, and even have

  2022-06-01 14:55:48 Views: 274
• 

  Database concern

  MySQL http://www.mysqltutorial.org/

  2022-06-01 14:55:48 Views: 209
• 

  Using python to monitor whether the mysql database is writable

  Monitor whether the database is writable, if your monitoring script logic is, show success after successfully writing to the database, otherwise show that it is not successful and then alarm. So here comes the problem, the database really can't be written, and the write command of your monitoring script will be stuck there by mysql hang until

  2022-06-01 14:55:47 Views: 289
• 

  No service after Mysql installation?

  Many people will encounter the need to restart the Mysql service manually when using it. But there is also a situation where there is no Mysql service for the service item, let alone a manual restart. Solution: find the mysqld.exe file in the bin directory of the Mysql directory and double-click to run it.

  2022-06-01 14:55:47 Views: 225
• 

  Sky Rabbit (Lepus) Monitoring operating system (OS) installation configuration

  Both the monitoring and the monitored side should install and configure snmp: [root @ HE1bin] # yum install net-snmp* [root@HE1bin] # vi / etc/snmp/snmpd.conf41 line def

  2022-06-01 14:55:38 Views: 245
• 

  Simple example of java connecting to oracle database

  Package cn.com.login.dao;import java.sql.Connection;import java.sql.DriverManager;import java.sql.Pr

  2022-06-01 14:55:37 Views: 244
• 

  From the introduction to Zero Foundation of Access Database to Chinese programming Software Development part 1

  Access is a very important part of the office office suite, and now it has become the most popular desktop database management system. This course is the first part of a series of courses on Access database knowledge (please follow the follow-up course). Course objective: to explain with simple examples, zero

  2022-06-01 14:55:34 Views: 204
• 

  MYSQL realizes the operation of master-slave insert and query separately

  The driver of the

  2022-06-01 14:55:34 Views: 207
• 

  Database backup and restore series-- detailed and complete implementation of single table backup and recovery

  Reference implementation: https://www.percona.com/doc/percona-xtrabackup/LATEST/innobackupex/innobackupex_script.htmlRest

  2022-06-01 14:55:31 Views: 233
• 

  (3) Construction of lnmp environment: installation of mysql source code

  About mysql: MySQL is a relational database management system, developed by MySQL AB, Sweden, and currently belongs to Oracle products. MySQL is the most popular relational database management system, and MySQL is the best in WEB applications.

  2022-06-01 14:55:31 Views: 241
• 

  Due to too many Blob fields in the database, the processing method of binlog from the database can not be carried out normally.

  Due to too many Blob fields in the database, the processing method that binlog cannot be carried out normally from the library when binlog_format is in row format records not a simple sql, but the actual changed rows, and some large DML operations will lead to binlog

  2022-06-01 14:55:30 Views: 219
• 

  Oracle 11g online redefine normal table variable partition table

  The first method uses the primary key id to redefine-- create user test identified by 1 account unlock;--grant resource--grant create any

  2022-06-01 14:55:29 Views: 219
• 

  MongoDB Replica Sets test

  When using Master-Slave mode before, once Master is stopped, the Java client will report an exception. At this time, there is no Master. Slave will not automatically take over Master Replica Sets is also a kind of Mas.

  2022-06-01 14:55:29 Views: 299
• 

  Sybase ASE15.7 silent installation

  Sybase ASE 15.7 silently install the response file to explain the experimental environment. The installation directory for installing RHEL 5.5 Sybase version:15.7Sybase under HP DL580 is / opt/SybaseSyba.

  2022-06-01 14:55:29 Views: 244
• 

  Conflicts with file from package mariadb-libs

  Recently, more and more customers have deployed MySQL/MariaDB in production environment, and people have more and more confidence in open source database. # rpm-ivh mysql-community

  2022-06-01 14:55:29 Views: 224
• 

  JAVA Foundation-- JDBC

  First, JDBC I, JDBC Overview JDBC and ODBC are based on an idea: programs written according to JDBC can communicate with the driver manager, while the driver manager communicates with the actual database through the driver. In the three-tier application mode, the client does not call the database directly

  2022-06-01 14:55:17 Views: 223
• 

  SQL of Oracle Learning (1) Retrieving Data Using the SQL SELECT statement

  What can SELECT do? Projection: the column specified in the query table. Selection: query the specified rows in the table. Join: joins between tables, the data to be viewed is placed in multiple tables, and the data between tables is related to each other. The base of the SELECT statement

  2022-06-01 14:55:17 Views: 288
• 

  A simple JDBC linker

  Package com;import java.sql.Connection;import java.sql.ResultSet;import java.sql.SQLException;import

  2022-06-01 14:55:13 Views: 304
• 

  Introduction to MySQL database-- where clause, combined where clause

  The where clause of the select statement specifies that the search criteria filter the data displayed. (1) use where clause in the select statement, the where clause is given after the from clause and returns the data that meets the specified search criteria: select prod_

  2022-06-01 14:55:13 Views: 201