mdx query

Tags: share track picture ack purge backup LED option integrationObjectiveThe log of the database is a strong basis for helping the database administrator to track the various events that have occurred in the database before. MySQL provides error log, Binlog log (binary log), investigate log, slow query log. Here, I seek to solve the following question: What is the purpose of each log? How to control these logs? How do I use the information provided b

Let's first review the basic knowledge of field selectivity. -- Basic knowledge of field selectivity -- Introduction: Can I create indexes for all fields? As shown in the following table, the sort field has very poor selectivity. You can run the show index from ads command to see that sort's Cardinality (hash level) is only 9, and this field should not be indexed: Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null

ASP. NET Aries getting started development tutorial 3: Develop a list page and control query area, aries query AreaPreface: After all, the Aries framework is a development framework, so the focus is to write code so that developers will not be unemployed.Step 1: Create an html Create an Html file in three steps: 1: Introduce Aries. Loader. js2: Get a table tag 3: new AR. DataGrid Of course, I copied the co

Hibernate Query cache: Definition: the query cache is based on the second-level cache. It can save the query results of common attributes. When querying an object, it saves the id as the key and the query result as the value, when accessing the next object, you can directly find When querying object objects in the cac

Many query conditions can be set in the query windowThe input from the form to the query criteria required by the Load method of the DataGrid presents a new query to the original request address, displaying the results in the DataGridConversion method See code commentJPA with conditional paging queries in the following

process.Step Two: Statement parsingWhen the client sends the SQL statement to the server, the server process parses the statement. In the same vein, this parsing work is done on the server side. Although this is only an analytic action, it will do a lot of "gestures".1. Query the cache. The server process does not go directly to the database query when it receives the SQL statement that the client sends ov

The actual database contains many tables, and it is not possible to query only one table in practical applications. If a query involves more than two tables, it is called a connection query. A connection query is the most important query in a relational database. The connect

Label:1. Introduction to Slow Queries http://hllnihao.iteye.com/blog/1461472 2. Pt-query-digest Installation http://blog.csdn.net/seteor/article/details/24017913 [Email protected]]# wget percona.com/get/pt-query-digest [[email protected]]# chmod u+x pt-query-digest 3. Use (1) Direct Parse slow query file: PT-

0. Stored procedure start variable definition@FBeginDatevarchar10),--Document Start date@FEndDatevarchar10),--Document due date. @FItemID varchar (50), @FItemID2 50 @FCust varchar (50), @FCust2 varchar ( 50varchar (1. Date range Queryand t.fdate>=@FBeginDate andt.fdate@FEndDate='2100-01-01end 2, Customer code range queryand T11. Fnumber>=@FCust andT11. Fnumber@FCust2= then(end 3. Item Code Range Queryand T14. Fnumber>= andt14. Fnumber@FItemID2= then(end 4, Document type fuzzy

I. Why should I enable this query? Databases are prone to bottlenecks. Now Nosql is so popular that it is estimated that they are all depressed by databases. The statements that affect the query speed in mysql are very slow. These slow statements may be written improperly or the Combined Query of multiple tables in big data, so we need to find out these words. I.

HQL is short for Hibernate Query Language, that is, hibernate Query Language: HQL adopts the Object-Oriented Query Method. HQL queries provide more abundant and flexible query features. Therefore, Hibernate sets the HQL query method as the standard

About MySQL lsquo; showglobalstatusrsquo; Output Com_select, Queries, Questions, Qcache_hits, Qcache_inserts, Qcache_not About MySQL lsquo; show global statusrsquo; Output Com_select, Queries, Questions, Qcache_hits, Qcache_inserts, Qcache_not The status values Com_select, Queries, Questions, Qcache_hits, Qcache_inserts, and Qcache_not_cached output by 'show global status' in MySQL have been somewhat confused, now we can learn more accurately and deeply through experiments. Lab version: 5.5

Crieria.uniqueresult (); Represents the result of a single fetchLazy load, do not load as long as it is not applicable (depending on the policy of the configuration file)Sometimes you want to overwrite the policy of the configuration file-------The introduction of the left connection Two retrieval statements are written to represent an and relationshipSQL1 and SQL2,Expression.eq equalsExpression.alleqEXPRESSION.GT Greater thanExpression.in needs a collection of Add (expression.in ())Set set =ne

Next: T-SQL Dynamic Query (1)--IntroductionObjective:In the development of features, we often encounter scenarios such as the following: The application has a query function that allows the user to select the desired condition in many query conditions. This is also the focus of this series.But sometimes you may find that some conditions are more or less mutually

Next introduction to ORM Query Language (oql)-instanceI. SQL and ORM Relational Database Service (RDBMS) queries are structured query languages (Structured Query Language). Compared with advanced programming languages (imperative languages), SQL mainly describes what to do, SQL is also known as the fourth generation language (4gl) and is supported by most modern