server lookup

Small Program Ape SQL Server Cognitive growth 1. Did not graduate or work not long, only know that there is a database, SQL such dongdong, unaware of the SQL and SQL Server Oracle, MySQL relationship, usually considered SQL is SQL Server 2. Worked

Objective The previous sections are all about the basics, and we'll talk about index performance optimization in this section, when the large data processing first thought is the index, once encountered such a problem is a rush, all kinds of

Resolve the SQL Server to focus on the removal (Bookmark Lookup, RID Lookup, Key Lookup), bookmarkrid Preface The previous sections focus on basic content. In this section, we will talk about index performance optimization. When processing big data,

Fuzzy Lookup pre-loads a reference table, and when executed, Fuzzy Lookup extracts the source data and blurs each row of data in rows and reference tables , The index of the output matching degree: Similarity and trust (similarity and Confidence).

In the map, the non-connected lookup transformation is separate from the pipeline. You can use the: LKP reference qualifier to write an expression to invoke lookups in other transformations. Common uses for non-connected lookups include:

You can configure a connected Lookup transformation to receive input directly from the mapping pipeline, or you can configure an open Lookup transformation to receive input from the expression results of other transformations.

PowerCenter uses the find criteria to test the received values. This is similar to the WHERE clause in the SQL query. When you configure a lookup condition for a transformation, the values in the transform input values and the lookup source or cache

Lookup is a common operation in ETL, such as product key-to-proxy key conversion and ID-to-name conversion. In addition to this normal conversion, The lookup transformation component in Informatica can also be used to update slowly changing

first, the concept of bookmark searchBookmarks can help SQL Server quickly direct from the nonclustered index entry to the corresponding line, but I can actually say a few words about it.　　If the table has a clustered index (the section structure),

first, the concept of bookmark searchBookmarks can help SQL Server quickly direct from the nonclustered index entry to the corresponding line, but I can actually say a few words about it.　　If the table has a clustered index (the section structure),