Getting started with mongodb I wrote how to install: http://blog.csdn.net/stronglyh/article/details/46805373 This article introduces mongodb First, check whether the service has been opened. There are two ways to open the service. The first is to
Character garbled during MySQL migration in Windows, mysql garbled We often copy a copy of the MySQL Data DIRECTORY directly to the new environment. Normally, we can restart MySQL to use it, but sometimes we will encounter some problems: 1. when
MySql storage engine SelectionThe storage engine is a MySql component that processes SQL operations for different table types. InnoDB is the default and most common storage engine and is also officially recommended unless in some specific cases. The
After installing SQL Server, the system prompts "overlapping IO operations in progress". sqlio The organization has built a new virtual machine and plans to deploy a. Net SQL System. The system is Server 2008 R2, and there is no software except
MySQL Study-MySQL architecture in-depth analysis, mysql-mysqlMySQL Study-in-depth analysis of MySQL Architecture MySQL Architecture It consists of connection pool components, Management Service and logging tool components, SQL interface components,
Mybatis calls the mysql stored procedure and returns the result set, mybatismysql A result set is often returned in a stored procedure. Mysql directly uses select to return the result set. Oracle uses a cursor to return the result set. This is
SQL split string, SQL split string /* The Delimiter is ',' */declare @ depid varchar (100) declare @ location intdeclare @ length int -- Sample string set @ depid = '2017, 13434, 34, 567,12, 9998, 'set @ location = 1 set @ length = 0 while @
Mysql uses DATE_FORMAT to recover erroneous data. Because of the new development project, when colleagues create data, the time format is "20150708", but the expected data format is ".The database uses mysql, and the time field type is varchar (10)
Redis configuration file redis. conf detailed description, redisredis. conf Redis. conf1. daemonize # By default Redis does not run as a daemon. use 'yes' if you need it. # Note that Redis will write a pid file in/var/run/redis. pid when daemonized.
SQL server is installed by default, how to create a new user and password, SQL server 1. Adapt to window identity Login2. Create a queryCreate login logs 1 with password = '000000'Create user bai2 for login lifecycle 13. Right-click the attribute
MySQL Optimization-securely shut down MySQL instances and optimized mysql instances Reprinted please indicate the source: http://blog.csdn.net/l1028386804/article/details/46812371Closing Process: 1. initiate shutdown and send a SIGTERM Signal 2.
Conversion of rows and columns in Hive1. Demonstrate converting multiple columns into a single rowData File and content: student.txtXiaoming | english | 92.0Xiaoming | chinese | 98.0Xiaoming | math | 89.5Huahua | chinese | 80.0Huahua | math |
Example of mydumper backing up mysql database and mydumpermysql Mydumper is a lightweight third-party open-source tool for mysql database backup. The backup mode is logical backup. It supports multithreading, And the backup speed is much higher than
About Oracle 10g schedule job, oracleschedule -- Job permission Grant create job to somebody;-- Job creationBeginDbms_scheduler.create_job (Job_name => 'agent _ LIQUIDATION_JOB ',Job_type => 'stored _ PROCEDURE ',Job_action => 'agent _ LIQUIDATION.
Enable MySQL query cache and MySQL Cache Enabling MySQL query cache can greatly reduce the CPU usage of the database server. The actual usage is: the CPU usage before enabling is about 120%, which is reduced to 10%. View the query cache status:
Example of myloader restoring mysql database and myloadermysql Mydumper is a lightweight third-party open-source tool for mysql database backup. The backup mode is logical backup. It supports multithreading, And the backup speed is much higher than
Oracle442 application scenarios --------- basic PL/SQL, basic plsql tutorial Bytes -----------------------------------------------------------------------------------The Application Scenario 207---231 is skipped after the backup and restoration of
Oracle442 application scenarios --------- database logic object management application scenarios, database Logic Design Use Case 128: create a temporary table Create a temporary table temp_goods Create global temporary table temp_goods(GoodsId
Convert multiple columns into one row, and convert multiple columns into one row. A friend asked me how to convert multiple columns into one row in Impala. In fact, the built-in functions in Impala can be implemented without using custom
Oracle442 application scenarios ---------- basic application scenarios and application scenarios /// // Basic knowledge ////////////////// Application Scenario 178: the simplest select statement SELECT * FROM Employees; Use Case 179: Specify the