Unix commands



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Hadoop Commands

hadoop archive The  hadoop archive  command creates a Hadoop archive, a file that contains other files. A Hadoop archive always has a  *.har  extension. hadoop classpath The  hadoop classpath  command prints the class path needed to access the Hadoop jar and the required libraries. hadoop daemonlog The  hadoop daemonlog  command gets and sets the log level for each daemon. hadoop distcp The  hadoop distcp  command is a tool used for large inter- and intra-cluster copying. hadoop fs The  hadoop fs  command runs a generic file system user client that interacts with the MapR file system. hadoop jar The  hadoop jar  command runs a program contained in a JAR file. Users can bundle their MapReduce code in a JAR file and execute it using this command. hadoop job The  hadoop job  command enables you to manage MapReduce jobs. hadoop mfs The  hadoop mfs  command displays directory inf...
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Minus in Teradata?...

Minus : It will provide the result which one is not matching from both tables... Note: It will provide the not matching result from first select table only. Select Emp_No from Emp Minus Select Emp_no from Emp_Dep;
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Database Size : Calculation in Teradata

SELECT DatabaseNameI, PermSpace, SpoolSpace, TempSpace,CreateTimeStamp FROM DBC.DBase WHERE DatabaseNameI = '[databasename]'; Permanent Space: Permanent space is the maximum amount of space allocated to the user/database to hold data rows. Perm space is used for database object (permanent tables, indexes etc) creation and to hold their data. The amount of permanent space is divided among the number of AMPs.Whenever per AMP limit exceeds the allocated space of AMP, 'No more room in database' error message is generated. Spool Space: Spool space is the unused permanent space which is used by the system to keep the intermediate results of the SQL query. Users without spool space cannot execute any query. Data is active up to the current session only. Spool space is divided among the number of AMPs. Whenever per AMP limit exceeds the allocated space, the user will get a spool space error. Temporary Space: Temporary space is the unused permanent space whic...
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