database table design best practices

/actual Extents'= (Ceiling (sum (pg_alloc) *1.00/ext_size) *100.00)/COUNT (*) fromextentinfo INNER JOIN Sysobjectson obj_id=idGROUP by [file_id],obj_id, index_id,partition_id, Ext_size, namehaving count (*)-ceiling (SUM (pg_alloc) *1.0/ext_size) >0ORDER by partition_id, obj_id, index_id, [file_id]Here we use the DBCC EXTENTINFO command to view the details of the extents in the database, and then look at the difference between the theoretical and the a

' newly created partition function ' end--partitioning scheme if exists ( SELECT * from sys.partition_schemes where name [emailprotected]) BeginPrint ' Here the modification needs to be executed before modifying the partitioning scheme ' endelsebeginexec ( ' CREATE PARTITION SCHEME ' [emailprotected]+ ' as PARTITION ' [emailprotected]+ ' to (' PRIMARY ', ' [email protected]+ ') print ' newly created partition scheme ' EndPrint '---------------The following is the variable definition value displ

I believe everyone knows about Weibo. But who knows what the Weibo database architecture is like? At today's 2011 Database Technology Conference, Yang haichao, Chief DBA of Sina, gave us a detailed explanation of the database architecture of Sina Weibo Based on MySQL distributed database

Tags: diagram definition condition management Create author promotion include apply color Atitit Database view view using recommended specifications and best practices and methodologies 1. Advantages of the view:1 1.1. * * improve readability and customize user data to focus on specific data 1 1.2. Using views, you can simplify data manipulation. 1 1.3. * * increase The refactoring change of the

Android data storage Sqlite uses SQLCipher database encryption practices, sqlitesqlcipherPreface: A recent study of Android Sqlite database (article address: http://www.cnblogs.com/whoislcj/p/5506294.html) and ContentProvider Program Data Sharing (http://www.cnblogs.com/whoislcj/p/5507928.html ), we clearly know the default storage location of the Sqlite

Design a flexible and stable multi-layer architectureProgramIt is not easy. With mature models and applications, you also need to experience various applications and requirements. To put it bluntly, you must be able to withstand the difficulties. Recently, when restructuring your EPN framework, I have some new experiences and practices to share with you. The first is the

Yundun practices Mysql series tutorial (2) the best database operations in history that you don't know, mysqlI. Database Operations 1. view the database Show databases; # default database: mysql-user permission-related data test-used for user test data information_schema-MyS

downtime alone, generally in the database maintenance time can be carried out. You can stop the DBCC SHRINKFILE operation at any point in the process, and any completed work will be preserved. If the operation is not completed within the specified time, it can be completely stopped.However, sometimes obviously see the data file There is space, why is not compressed or the situation it? This is usually because there are a lot of empty pages in the dat

Oracle DBA manual-database diagnosis cases and performance optimization practices (planned by guobiao) Pricing: ￥59.80 Member price: ￥44.85 (off) Example of this book free trial: http://www.china-pub.com/196286 [Basic Information]Author: Editorial Board of Oracle DBA ManualPress: Electronic Industry PressISBN: 9787121101397Mounting time:Published on: February 1, January 2010Start: 16Page number: 407Version:

Database optimization has a lot to say, according to the amount of data can be divided into two stages: stand-alone database and sub-Library, the former can support 500W or 10G of data, more than this value will need to consider the Sub-Library table. In addition, the general large business interview will often be from a stand-alone

to complete this task, it is not intuitive to use this tool to make it easy to maintain. Custom table This method is conservative and stable. Create a data table in the database to store the meaning of the table and its fields. Then, design a tool to update and maintain

while, the boss has some new products that need to be added with the "height" attribute. Do you feel that the database you designed is growing in this way, will it soon become a maze? So, is there any way to curb this unpredictability, but it is similar to repeated database expansion? I have read Agile Software Development: Principles, models, and practices and

. WriteValue (ref VT, ref CF, ref CA, ref CHL, ref rowIndex, ref colindex, ref str, ref CellFormat);}}}int ret = Excel. CloseFile ();if (ret!=0)//{MessageBox.Show (This, "error!");//}Else//{MessageBox.Show (This, "Please open file c:\\test.xls!");//}Open the Displayreturn filename;}#endregion#region to clean up outdated Excel filesprivate void Clearfile (string FilePath){string[] Files = System.IO.Directory.GetFiles (FilePath);if (Files.length > 10){for (int i = 0; i {Try{System.IO.File.Delete (

Label:Database Performance Best PracticesWhen an application needs to connect to a database, the performance of the application may be impacted by the performance of the database. For example, when there is a limit to the I/O capability of the database, or because an index is missing, the SQL statement that executes will need to traverse the entire