By Don Chamberlin
DB2 common Database (UDB) helps many differing kinds of functions, on many various types of information, in lots of varied software program and environments.
This booklet offers an entire consultant to DB2 UDB model five in all its points, together with the interfaces that aid finish clients, program builders, and database directors. it truly is complementary to the IBM product documentation, supplying a transparent and casual rationalization of the way the positive aspects of DB2 have been meant for use. it really is an intensive revision of the author's past ebook, utilizing the hot DB2: IBM's Object-Relational Database method . * deals whole and self-contained info, and doesn't suppose previous wisdom of DB2, SQL, or relational database strategies * Covers effortless ideas of database administration in addition to the complicated beneficial properties of UDB, together with recursive queries, constraints, triggers, user-defined datatypes, saved methods, parallel databases, and graphical instruments for database management * contains dozens of sensible suggestions that might retailer readers many hours of labor in constructing database purposes * offers 1000's of validated examples written in SQL, C, C++, and Java, all of that are on hand at the MKP website
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Additional info for A Complete Guide to DB2 Universal Database
Exporting into a Subset of Columns Problem You have data in Hadoop that you need to export. Unfortunately, the corresponding table in your database has more columns than the HDFS data. Solution You can use the --columns parameter to specify which columns (and in what order) are present in the Hadoop data. info Note the absence of whitespace with the --columns parameter. Discussion By default, Sqoop assumes that your HDFS data contains the same number and ordering of columns as the table you’re exporting into.
Speeding Up Transfers Problem Sqoop is a great tool, and it’s processing bulk transfers very well. Can Sqoop run faster? 7. info | 17 Discussion Rather than using the JDBC interface for transferring data, the direct mode delegates the job of transferring data to the native utilities provided by the database vendor. In the case of MySQL, the mysqldump and mysqlimport will be used for retrieving data from the database server or moving data back. In the case of PostgreSQL, Sqoop will take advantage of the pg_dump utility to import data.
8. Overriding Type Mapping Problem The default type mapping that Sqoop provides between relational databases and Hadoop usually works well. You have use cases requiring you to override the mapping. Solution Use Sqoop’s ability to override default type mapping using the parameter --mapcolumn-java. info --table cities \ --map-column-java id=Long Discussion The parameter --map-column-java accepts a comma separated list where each item is a key-value pair separated by an equal sign. The exact column name is used as the key, and the target Java type is specified as the value.
A Complete Guide to DB2 Universal Database by Don Chamberlin