Teradata Wiki Interview Questions Part

7 ensp 0183 ensp Interview Questions Part No AMPs may go down i e go offline while FastLoad is processing The down AMP must be repaired before the load process can be restarted Like many OLAP and aggregate functions WIDTH BUCKET is used to extract statistical information from sample populations The format of the function is as follows

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Query Hints Transact SQL

The join hint for the pair of tables may only restrict the selection of allowed join methods in the query hint For more information see Join Hints Transact SQL EXPAND VIEWS Specifies the indexed views are expanded Also specifies the Query Optimizer won t consider any indexed view as a replacement for any query

v tools Teradata Downloads

Teradata 13 0 supports a Java User Defined Function JUDF capability which returns an Aggregate Aggregate functions produce summary results In the last Article you were shown how simple it is to create a Table JUDF using Teradata tools

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240 A certain load is being imposed on the table and that too every hour The traffic in the morning is relatively low and that of the night is very high As per this situation which is the most advisable utility and how is that utility supposed to be loaded The most suggestible utility here has

Teradata Developer Teradata Developer Community

Watch bite sized videos to learn about the hundreds of powerful Advanced SQL Engine and machine learning functions that come with Vantage VIEW VIDEOS Vantage drivers tools applications and more Efficiently access publicly available downloads you may need to make full use of Vantage Available downloads include programming language drivers

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accounts payable invoice processing flowchart The Accounts Receivable Processes Explained AvidXchange The Receivables should not be confused with Accounts Payable AP While AP is the debt a company owes to its suppliers or vendors accounts

SQL Impala why can t I do two counts on one query

13 ensp 0183 ensp Impala does not currently support multiple count distinct expressions within the same query see IMPALA This is a requested feature but is surprisingly hard to implement so hasn t been added yet For now if you do not need precise accuracy you can produce an estimate of the distinct values for a column by specifying NDV column a query can contain multiple instances of NDV column

3570 Internal error processing query with aggregate

3570 Internal error processing query with aggregate functions Explanation The Optimizer has encountered an illegal combination of clauses in a query involving

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22 ensp 0183 ensp FastLoad can be restarted from previous checkpoint Performance Note Checkpoints slow down FastLoad processing – set the CHECKPOINT large enough that checkpoints are taken every 10 to 15 minutes Usually this requires a CHECKPOINT value much

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MERGE Purpose Merges a source row set into a primary indexed target table based on whether any target rows satisfy a specified matching condition with the source row IF the source and target rows THEN the merge operation satisfy the matching condition updates based on the WHEN MATCHED THEN UPDATE clause deletes b

Teradata for Developers Marty Weber

Teradata for Developers By Marty Weber Author of Big Data For Developers Overview Teradata is a data warehouse system that incorporated in1979 Teradata was the first data warehouse appliance It is highly scalable and it has always used parallel processing Teradata is ACID Compliant Atomicity Consistency Isolation Durability

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FastLoad utility is used to load data into empty tables Since it does not use transient journals data can be loaded quickly It doesn t load duplicate rows even if the target table is a MULTISET table Limitation Target table should not have secondary index join index and foreign key reference How FastLoad Works FastLoad is executed in


2 ensp 0183 ensp OLAP functions are similar to aggregate functions except that the aggregate functions will return only one value whereas the OLAP function will provide the individual rows in addition to the aggregates Syntax Following is the general syntax of the OLAP function

MySQL Aggregate Functions Tutorial SUM AVG

2 ensp 0183 ensp MySQL supports all the five 5 ISO standard aggregate functions COUNT SUM AVG MIN and MAX SUM and AVG functions only work on numeric data If you want to exclude duplicate values from the aggregate function results use the DISTINCT keyword


The block utilities have limits that prevent too many of them running at the same time This feature is actually controlled by a new DBS Control parameter named MaxLoadAWT which controls AMP Worker Tasks AWT When MaxLoadAWT is set to zero then it is like going back in time to pre V2R6 0 where only 15 FastLoad MultiLoad and FastExport jobs can run max

Teradata Training in Bangalore Teradata course in

Teradata training in Bangalore Job Oriented Teradata training course in Bangalore with certification Project Based Teradata training classes in Bangalore with Placement


30 ensp 0183 ensp Teradata supports common aggregate functions They can be used with the SELECT statement COUNT − Counts the rows SUM − Sums up the values of the specified column s MAX − Returns the large value of the specified column MIN − Returns the minimum value of the specified column AVG − Returns the average value of the specified column Example Consider the following

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18 ensp 0183 ensp Write records stored in a DataFrame to a SQL database Databases supported by SQLAlchemy are supported Tables can be newly created appended to or overwritten Parameters name str Name of SQL table con sqlalchemy engine Engine or sqlite3 Connection Using SQLAlchemy makes it possible to use any DB supported by that library

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Validate Query and Change JSON Data with Built in

Validate Query and Change JSON Data with Built in Functions SQL Server 07 17 2017 6 minutes to read 2 In this article APPLIES TO SQL Server Azure SQL Database Azure Synapse Analytics SQL DW Parallel Data Warehouse The built in support for JSON includes the following built in functions described briefly in this topic

Using the SUM AVG COUNT MIN MAX Operators in

Using the SUM AVG COUNT MIN MAX Operators in SQL you need to use aggregate functions Aggregate functions are premade SQL functions that you can use instead of building your own code There are several functions to choose from and the syntax depends on your platform you just want to get a quick count of the number of records

Teradata SQL Tuning – 6 Golden Rules You Must

30 ensp 0183 ensp Have you ever wondered which steps reliably improve query performance This Teradata SQL Tuning article reveals it Expect 80 faster queries if you

BIGDATA TeraData Interview Questions

16 ensp 0183 ensp What is the difference between v2r5 and v2r6 V2R6 included the feature of replica in it in which copy of data base are available on another system meam V2R6 provide the additional data protaction as comprison to V2R5 while if data from one system has been vanishes

Teradata JDBC Driver User Guide Chapter 2

2 ensp 0183 ensp The following table lists the Teradata JDBC Driver connection URL parameters and values Beginning with Teradata JDBC Driver 16 00 00 28 the Teradata JDBC Driver validates URL connection parameters and throws SQLException for an invalid parameter name and or invalid value

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