This section describes how to migrate Teradata Perl files.Run the runDSC.shor runDSC.bat command and set --application-lang to perl to migrate Teradata BTEQ or SQL_LANG s
These variables are executed by using the PREPARE and EXECUTE statement in Perl. DSC can extract SQL statements from Perl variables and migrate them. true: enables the migration of Perl variables containing SQL statements. false: disables the migration of Perl variables containing SQL statements. ...
UNION ALL – can be used with APPLY to combine multiple data files (and optionally from different data sources) into a single source data stream. File List – this is filename which contains a list of the data files to process. Directory Scan – can be used to scan a directory for file...
SQLstatementFunction SELECT Performrelationalqueryfunctions.(Select, Project,Join,Union,Intersect,Minus) INSERTPlaceanewrowintoatable. UPDATEModifyvaluesinanexistingrow. DELETE Removearowfromatable. SQLCommands-DCL DataControlLanguage(DCL) SQLstatementFunction ...
Running an Existing Statement or Script Configuring the compute group option Using the Simple Query Builder Visualizing Data Launching Visualization Results Tab Charts Tab Monitoring and Managing Queries Summary View Query Monitoring Detail View Query Breakdown Overview Tab SQL Tab Expl...
If one of the SQL statements in Macro fails, then all the statements are rolled back. Macros can accept parameters. Macros can contain DDL statements, but that should be the last statement in Macro.Create MacrosMacros are created using CREATE MACRO statement....
2326712906547518258041 Teradata ParsingEngine(s)Notes:TheParsingEnginedispatchesrequesttoinsertarow.MessagePassingLayer TheMessagePassingLayerinsuresthatarowgetstotheappropriateAMP(AccessModuleProcessor).AMP4 AMP1 AMP2 AMP3 TheAMPstorestherowonitsassociated(logical)disk.218 5441 129075 8032676 25 AnAMPmanagesa...
Stored Procedures:A stored procedure is a pre-defined set of statements invoked through a single CALL statement in SQL. While a stored procedure may seem like a macro, it is different in that it can contain: Teradata SQL data manipulation statements (non-procedural) ...
SQL写法不优化,忽略了Teradata的机理与特性 --调整SQL ? Teradata优化器未得到足够的统计信息 --Collect Statistics 4.Multiple Insert/select -- Multi-Statement Insert/Select * 并行插入空表不记录Transient Journal * 充分利用Teradata向空表Insert较快以及并行操作的特性如: ? 现状 INSERT INTO ${TARGETDB}.DES...
b) Use the CASE statement and the WHERE clause in the APPLY statement to limit sets. c) Create a custom filter operator using C or C++. Standalone operators:[No Data Streams]which performanyprocessing that doesnotinvolve sending datato,orreceiving datafromthe data stream ...