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Original address: http://blog.sina.com.cn/s/blog_3c9872d00101p4f0.htmlNutch 2.2.1 was released nearly two months ago, and this version has changed significantly compared to the previous version of Nutch, especially the installation and configuration

1. OverviewFunction: Used to detect and repair corrupted data blocks on tables and indexes.2, the composition of the package1), Admin_tablesSyntax: Dbms_repair.admin_tables (table_name in Varchar2,table_type in Binary_integer,action in

Creating an index is the establishment of an index on one or more columns of a table to increase the speed of access to the table. There are 3 ways to create an index, the 3 ways to create an index when creating a table, to create an index on a

Install and configure PowerDNS and PowerAdmin in RHEL/CentOS 7 PowerDNS is a DNS server running on many Linux/Unix derivative versions. It can be configured using different backend systems, including BIND regional files and relational databases, or

The mysql script does not have CREATETABLE 'P _ c_a' ('id' varchar (255) DEFAULTNULL, 'area _ info' varchar (255) DEFAULTNULL, 'Father _ id' varchar (255) DEFAULTNULL, 'area _ level' varchar (255) DEFAULTNULL) ENGINEInnoDBDEFAULTCHARSET The mysql

Btcpool-slparser (share log parser) module analysis core mechanism Summary Three functions are supported:??Specify the date and UID to print the share information of the user specified by the specified date to stdout.????When uid = 0, the share

Author: skateTime: 2013/05/14 MySQL table sharding principles When using MySQL in large quantities and with high data access, we will introduce the MySQL sharding standards to improve the performance of table sharding.   Environment:Business type:

The SQL statement for data deletion and the SQL statement for data deletion No matter whether you are a new college student or a veteran who has been fighting in the software field for many years, as long as you mention the SQL statements used to

1. install the lamp environment successfully. 2. install powerdns # yum-yinstallpdnspdns-backend-mysql to connect to mysql: # mysql-uroot-p to create a powerdns database: & gt; CREATEDATABASEpowerdns; for Po 1. installation prerequisites The lamp

Key words: dbpartition by hash (' investor_apply_id ')Format: Dbpartition by hash (Sub-Library field)Create an example:CREATE TABLE ' bb_jyls_new ' (' id ' int (one) not NULL auto_increment,' source_code ' varchar DEFAULT NULL,' source_product_code '

ProfileThe main introduction quartz how to use, the principle please read the following references, collation has been very detailed. The primary purpose of using a quartz cluster is to avoid a single-point job failure, which is automatically

Yii2-admin is Yii2 RBAC a set of management tools, to achieve a beautiful interface and complete rights management functions, do not have to write permission code, before use, please update YII2 source to the latest version.Git Source Address: https:

Disk Space Trend Analysis of MySQLschema and binarylog Disk Space Trend Analysis of MySQL schema and binary log [root@skatedb55 dist]# ./mysqlsize --helpusage: Database diskspace usage v0.1 ,(C) Copyright Skate 2014[-h] [--load LOAD] --dbtype DBTYPE

When creating an index, the MySQLMyIsam storage engine has a strict length limit. The maximum length of all index keys cannot exceed 1000, and it is not the sum of actual data lengths, the sum of the index key field definition length. Let's take a

Source: http://blog.rds.aliyun.com/2014/05/23/%E4%B8%80%E4%B8%AA%E7%94%A8%E6%88%B7sql%E6%85%A2%E6%9F%A5%E8%AF%A2%E5 %88%86%e6%9e%90%ef%bc%8c%e5%8e%9f%e5%9b%a0%e5%8f%8a%e4%bc%98%e5%8c%96/Problem descriptionA user reflects that the first line of an

Change normal table Baby_user_change_log to partition tableFirst, the table column descriptionmysql> desc Baby_user_change_log;+--------------+------------------+------+-----+---------+----------------+| Field | Type | Null | Key | Default | Extra |+

When the amount of database data rises to a certain amount, performance becomes the problem that we can't help but how to optimize? There are a few common ways:1, sub-table, that is, a large expression of data into several tables, so that each table

DemandThere is one such demand now. There is a table in MySQL. The data grew very fast. However, this data is valid for 1 months, the record of one months is not very important, but can not be deleted. In order to ensure the query speed of this

Author:skateTime:2013/05/14MySQL Sub-table guidelinesIn the massive use of MySQL, data volume, high access, in order to improve performance needs table processing, introduction of MySQL sub-table standards, follow-up will continue to

CREATE TABLE' Security_role_resource ' (' ID ')varchar( -) not NULL DEFAULT "', ' role_id 'varchar( -)DEFAULT NULL, ' resource_id 'varchar( -)DEFAULT NULL, ' date_create 'timestamp NULL DEFAULT NULL, ' date_update 'timestamp NULL DEFAULT NULL, '