The success of relational database technology in data processing is due, in part, to the availability of non-procedural languages (i.e., SQL), which can significantly improve application development and end-user productivity. By hiding the low-level details about the physical organization of the...
The workflow for a large-scale distributed approximate query processing proposed has several steps: Logical Plan (LP)—a query is compiled into an LP consisting of three procedure to compute: (1) an approximative answer θ(S); (2) error ξ¯; (3) diagnostic tests; Physical Plan (PP)—...
如图所示,搜索引擎的链路主要分为 查询词处理(query processing,QP)、召回(retrieval)、排序(ranking)。接下来我们逐 一讨论 QP、召回、排序。 搜索引擎的链路 QP 是链路上的第一环,用自然语言处理(natural language processing,NLP)技术从 查询词中提取很多信息,共链路下游的召回和排序使用。QP 中常见的任务包括...
A normalized database eliminates functional dependencies in the data so that updating the database is easy and efficient. However, querying the database might require many joins of tables in order to combine information together. As the number of join tables increases, the query running time incre...
Text description of the illustration pls81003_query_processing.gif Multi-row query processing is somewhat like file processing. For example, a COBOL program opens a file, processes records, then closes the file. Likewise, a PL/SQL program opens a cursor, processes rows returned by a query, th...
Data retrievalAn OLAP server returns new data to Excel every time that you change the layout of the report. With other types of external source data, you query for all the source data at once, or you can set options to query only when you display different report filter ...
Batch processing is used in many industries for tasks ranging from payroll processing; statement generation; end-of-day jobs such as interest calculation and ETL (extract, load, and transform) in a data warehouse; and many more. Typically, batch processing is bulk-oriented, non-interactive, and...
/{ushort=1} Rejected if the query processing is relative to a top level of the metadata hierarchy. This is because the top level contains only metadata blocks and not data items.Photo Metadata Policy ExpressionsAs noted previously, a fully qualified query expression starts with a slash (/). ...
This chapter introduces the tools, technologies, and processes through which you can build Oracle Event Processing applications, including the programming model, how applications work, and key concepts and technologies.
Service. You can use Query Service to join any dataset in the data lake and capture the query results as a new dataset for use in reporting, machine learning, or for ingestion into Real-Time Customer Profile. This document provides an overview of the role of Query Service within Experience ...