#Db2 data generator how to#

SELECT ADD_HOURS (“”, 55) as “ADD_HOURS output” This function is used to add certain number of hours in the specified expression and returns the value that is in datetime format having newly added hours as specified in arguments. SELECT ADD_ MINUTES (“”, 1500) as “ADD_MINUTES output” This function is used to add certain number of minutes in the specified expression and returns the value that is in datetime format having newly added minutes as specified in arguments. SELECT ADD_DAYS(“”, 50) as “ADD_DAYS output” This function is used to add a certain number of days in the specified expression and returns the value that is in datetime format having newly added days as specified in arguments. SELECT DATE_ MONTHS (“”, 10) as “ADD_MONTHS output” This function is used to add the certain number of months in the expression and returns the value that is in datetime format having newly added months as specified in arguments. The purpose and description for each of the functions are also specified in the following table showing date functions of DB2. Let us now have a look at some of the additional date-related functions that are available in DB2. The output of the execution of the above query statement gives out the following resultant value of the current timestamp value as shown in the below image – SELECT current timestamp as 'Current timestamp value' FROM sysibm.sysdummy1 We can make use of the following query statement to get the current timestamp value in DB2 – The output of the execution of the above query statement gives out the following resultant value of current time value as shown in the below image – SELECT current time as 'Time Right now' FROM sysibm.sysdummy1 Now, we will try to retrieve the current time value which can be retrieved in DB2 by using the following query statement – The output of the execution of the above query statement gives out the following resultant value of the current date value as shown in the below image – SELECT current date as 'Today's date' FROM sysibm.sysdummy1 For example, if we want to retrieve the current value of date then it can be retrieved by using the following query statement – There are certain in-built DB2 registers that help us to retrieve the date-related values for the current period. Note that this is an interface limit to prevent over-provisioning (100,000 warehouses may generate up to 10TB of data), however it is straightforward to exceed this capacity by manually modifying the generated datageb build script to increase the value.Hadoop, Data Science, Statistics & others From version 4.2 the limit for generating the TPROC-C schema has increased from 30,000 to 100,000 warehouses.

#Db2 data generator how to#

This chapter details how to generate and load large data sets with HammerDB. Additionally bulk loading can enable more flexibility to modify the schema according to preference and reload during testing. This option may be preferred for example where the target database to load is located in the cloud or where the target database has a column structure meaning that load performance using batch inserts is poor. Nevertheless in some circumstances it is preferable to create the data externally as flat files and then use a special database vendor provided bulk loading command to load the data into pre-created tables. PostgreSQL/Amazon Redshiftįor all workloads HammerDB can create the schema and generate and load the data without requiring a staging area, in many circumstances this is the preferred method of loading especially for OLTP workloads. Capture and run the table creation DDL 3.1.1.