field value, so you cannot use the char type, but the varchar. A full-text index that is long for a field's value. 9, DB server and Application server separation, OLTP and OLAP separation 10, distributed partitioned views can be used to implement a federation of database servers. A consortium is a set of separately managed servers, but they work together to shar
first created. You do not have to declare percentages in PAD_INDEX because the percentages specified by the following Filltactor options are used. It would be meaningless to set pad_index=on without the FILLFACTOR option. 5, FILLFACTOR When SQL Server first creates an index, it will, by default, fill the page as much as possible, leaving only two records of the control, and you can set Filltactoe to any
indexes, page compression, row compression, and column storage indexes, and of course, if we count the nonclustered indexes of traditional tables, then the row storage table will need more space. We used a simple comparison of more than 3W of data, as shown in Figure 7.
Figure 7. Different storage occupancy space
The sample data in Figure 7 is very small, but you can still see that the column store is almost 2/3 less occupied than the row store without the nonclustered index, which is not a
, how can we tell which tables need to be indexed and which are not?Typically, SQL Server executes a query script with an existing index, and if no index is found, it is automatically generated and stored in the DMV (dynamic management view). This information is purged whenever the SQL Server service restarts, so it is
execute on the Windows platform, the. NET program support is better, for the general application is enough. Basically, there is very little use of database products other than SQL Server in the. NET camp:. net+sqlserver+windowsOracle: Supports most platforms, but under Windows performance is less expensive than SQL Server
complexity, you must take action to provide the best data access time. SQL Server 2008 includes many features and enhancements to optimize the performance of all aspects of functionality, including relational online transaction processing (OLTP) databases, online analytical processing (OLAP) databases, reports, data extraction, transformation, and load (ETL) pro
Tags: pointer height memory statistics Test Eve theme phrase logicTransfer from: http://www.cnblogs.com/CareySon/archive/2011/12/22/2297568.html introduction In SQL Server, an index is an enhanced presence, which means that even without an index, SQL Server can still implement its due functionality. However, indexes c
returns an int value. Example: Select COUNT_BIG (prd_no) from Sales 7. GROUPING produces an additional column that, when added with the cube or rollup operator, outputs a value of 1. The output value is 0 when the added row is not generated by cube or Rollup. Example: Select Prd_no,sum (qty), Grouping (prd_no) from the sales group by PRD_NO with Rollup 8. Binary_checksum returns the binary checksum value c
file can only be a member of a filegroup and cannot be a member of more than one filegroup.The log file can never be a member of any filegroup.Data information and log information cannot be placed in the same file or filegroup.4. Database System server Type:(1) Database engine: Core Services, is a complex system, responsible for data storage, processing and security;(2) Analysis Services: Analyze mining data, support the local
to the SSAS server, and then look at the accuracy of the algorithm for the current mining model, the exact rate of the mining model we built in this example is only 16.67% very low, and one important reason is that we are using too little data for data training. This number can be significantly improved after the amount of data trained is increased.Finally, we can call DMX statements on the built mining model to do the data prediction, we use the gra
stored procedures that are used to view, manage, and secure data. You can use SQL Server Management Studio to manage database objects and capture server events using SQL Server Profiler.Analysis ServicesAnalysis Services is a core service that enables fast analytics of busi
platform that enables you to:
· Unify the storage and access of all data in the enterprise.
· Establish and manage complex business intelligence solutions.
· Expand the scope of your business intelligence solution to make it available to all employees.
SQL Server 2008 forms the basis for this powerful business intelligence, and its unique techniques are as follows:
" is composed of
SQL Server 2008 methods to delete or Compress database logs 2010-09-20 20:15Because the database log growth is set to "unlimited", so the time a long log file will inevitably be very large, a 400G database actually has 600G log file, seriously occupy the disk space. Because the main is to do OLAP, so the database itself will not have a big change, so the log will
Label:Remote procedure call failed in SQL Server 2008 Administration Tool 0X800706BE Solution-MSSQL-Cube Network-Computer knowledge and technology interactive exchange platformHttp://www.it165.net/database/html/201305/3884.htmlWorkaroundThis issue occurs because the "Microsoft SQL
SQL Server (c) grouping type conversion functions insert multiple data String functionsMy own study notes, reproduced please indicate the source, thank you!---sauerkraut1.SQL Data grouping----Group by/having① has a student information sheet: STUID/STUNAME/STUAGE/STUGENDER/STUCLASSID;For each class ID and corresponding number: Select Stuclassid class Id,count (*)
Microsoft SQL Server 2005 Analysis Services (SSAS) provides online analytical processing (OLAP) and data mining capabilities for business intelligence applications.Microsoft SQL Server 2005 Integration Services (SSIS) is a platform for building high-performance data integrat
-group (suppergroups) into VT5, generating VT6.
Having : apply a having filter to VT6. Only groups that are true are inserted into the VT7.
Select: processes the select list, producing VT8.
DISTINCT: removes duplicate rows from VT8, resulting in VT9.
ORDER BY: generates a cursor (VC10) by sorting the rows in VT9 by the list of columns in the ORDER by clause.
TOP: selects the specified number or scale of rows from the beginning of the VC10, generates the table VT11, and returns the call
certain impact
Log shipping
Whether
Yes (read only)
N
Library
Whether
UNC way to access
Replica library disconnects connected users when doing resotre/may affect regular log backups
Publish a subscription
Is
Yes (read and write, but write may result in inconsistent data)
N
Table (query)
Is
Domain/non-domain
When there is a large number of DML operations on the main library , there is a certain imp
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