how load works in teradata?
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Direct loading — Teradata tools load data directly from the source. There's no need for time-consuming file split- ting, intermediate files, or manual data conversions. Automatic allocation — The Teradata Database auto- matically allocates data across nodes. No manual intervention is required.
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TPump is shortened name for Teradata Parallel Data Pump. Fastload and Multiload are the loads which contains huge volume of data. ... TPump performs Inserts, Updates, Deletes and Upserts from Flat filed to populated Teradata tables at ROW LEVEL.
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['Scalar Functions (Returns A Single Value)', 'Inline Table Valued Functions (Contains a single TSQL statement and returns a Table Set)', 'Multi-Statement Table Valued Functions (Contains multiple TSQL statements and returns Table Set)']
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The main difference between normal and bulk load is, in normal load Informatica repository service create logs and in bulk load log is not being created. That is the reason bulk load loads the data fast and if anything goes wrong the data cannot be recovered.
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['SELECT statements to select the fields of data you want to extract.', 'WHERE clauses to filter data.', 'ORDER BY clauses to sort data.', 'GROUP BY clauses to group data together.', 'Using the HAVING clause the user can filter groups of data.']
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['2.1 Use Prepared Statement. ... ', '2.2 Use Connection Pool. ... ', '2.3 Disable Auto Commit Mode. ... ', '2.4 Use JDBC Batch Statements. ... ', '2.5 Accessing Result Set by Column Names. ... ', '2.6 Use Bind variables instead of String Concatenation.']
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['Right Click over the Database name -> Tasks -> ExportData.', 'Choose the table as Data Source.', 'Choose Flat file destination as destination.', 'Choose a FileName.', 'Mark "Column Names in the first data row"']
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BigQuery stores data in a columnar format known as Capacitor. As you may expect, each field of BigQuery table i.e. column is stored in a separate Capacitor file which enables BigQuery to achieve very high compression ratio and scan throughput.
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['Name. CREATE TABLE AS -- define a new table from the results of a query.', 'Synopsis. CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } | UNLOGGED ] TABLE table_name [ (column_name [, ...] ) ] [ ... ', 'Description. CREATE TABLE AS creates a table and fills it with data computed by a SELECT command.']
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The simplest concept in data loading is the mighty flat file. ... Flat files are the universal mechanism for moving data from one database or system to another. There are two common types of flat files: CSV (comma separated values) and delimited files. Both are file formats that represent relational data in a text file.
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['Open the table by double-clicking it in the Navigation Pane.', 'Scroll horizontally to the rightmost column in the table, and click the Click to Add column heading.', 'In the list that appears, click Calculated Field, and then click the data type that you want for the result.']
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The main difference between get() vs load method is that get() involves database hit if an object doesn't exist in Session Cache and returns a fully initialized object which may involve several database calls while load method can return proxy in place and only initialize the object or hit the database if any method ...
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['Numeric Types. TINYINT (1-byte signed integer, from -128 to 127) SMALLINT (2-byte signed integer, from -32,768 to 32,767) ... ', 'Date/Time Types. TIMESTAMP. DATE.', 'String Types. STRING. VARCHAR. ... ', 'Misc Types. BOOLEAN. ... ', 'Complex Types. arrays: ARRAY<data_type>']
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['Open the Data Source Explorer and navigate to the Tables folder in a Teradata Database.', 'Right-click a table object and select Data > Load Data.', 'In the Data Transfer Wizard, select Teradata as the Source Type and click Launch.', 'Select the table to copy by specifying Source information:']
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Teradata Vantage™ - Database Introduction Vprocs are a set of software processes that run on a node under Teradata Parallel Database Extensions (PDE) within the multitasking environment of the operating system. ... Each AMP owns a portion of the overall database storage.
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The major difference between a load and an import is that a load is much faster. Unlike the import tool, data is not written to the database using normal insert operations. Instead, the load utility reads the input data, formats data pages, and writes directly to the database.
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['Create a standard Select query. ... ', 'Select Query → Update to change the type of query to an update action query.', 'Drag the field to be updated in the target table to the query grid. ... ', 'Optionally specify criteria to limit the rows to be updated.']