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Today, when our ETL jobs scan large amounts of data from a table with out using RS/RR isolation levels under certain conditions they see duplicate data and/or missing data. This could be caused due to the fact that rows that were already scanned c...
Differentiate between Read and Write IO performance (Overhead and TransferRate) and optimise accordingly
Background: Db2 is sensitive to IO performance, and compiles access plans accordingly to optimise IO versus CPU costs. At the tablespace level, average Overhead and TransferRate are configured in units of milliseconds. Issue: customers such as our...
IBM i Access Client Solutions (ACS) should be able to use a DB2 file as input from iseries
Very often a user gets a list of (hundreds or even thousands) similar changes to make. He gets the list of course in excel or text file and needs to type these in a green screen (5250 emulation). In Client acces there was a neat solution for this:...
Ubuntu 16.04 LTS has End of life as April 2021. We use IBM DB2 11.1.4 Enterprise Edition on Ubuntu 16.04 LTS for our MDM instances which is not compatible with the higher versions of Ubuntu -18.04 LTS and above. Same is true for the updated versio...
When issuing a sentence like:
db2 drop audit policy SELECT_ALL_TABLES
The returned error message does not include the schema of the problematic object:
SQL0478N The statement failed because one or more dependencies exist on thetarget object....
Latch information and more internals information for performance analysis
Detailed information about LATCH to DBA. More information of wait events would be good too like if a statement is waiting for a sequential read, how much the transaction is spending on network time , block concurrency, and so on.
Reproduce Scenario and found to be a expected behavior while CTAS locks syscat.tables session 1 > create table Table1 as (select * from Table_2 ) with data; session 2, query tool > select * from syscat.tables; --> lock waiting
Add options for "recommend indexes" and "evaluate indexes" explain types to explain_from_section
When running explains from jupyter notebook, I prefer to use EXPLAIN_FROM_SECTION. However for in-depth analysis of indexes, I need the RECOMMEND INDEXES and EVALUATE INDEXES explain modes. These don't seem to exist for EXPLAIN_FROM_SECTION. This ...
Tool db2batch should be able to display Number of rows affected
Often db2batch is used for tuning / benchmarking purposes and very often the number of affected rows is interesting.
Command line tool. 'db2'. provides the option to display the Number of rows affected, db2 -tvmf <SQL-DML-File>
$ db2 -t...
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