I was having issues with mysql. I was saving individual hashrefs into an array and my script wasn't providing any results. I started running via:

 $ DBI_TRACE=2 perl get_data.pl

and saw messages such as:

Handle is not in asynchronous mode error 2000 recorded: Handle is not in asynchronous mode

A post in this thread: https://www.nntp.perl.org/group/perl.dbi.dev/2015/07/msg7950.html suggested increasing the trace level to 4 for more insight. (It also seemed to think DBD::mysql was buggy.)

I tried DBI_TRACE with 4 and didn't see anything new. However, changing to using fetchrow_arrayref started showing data again. :-)

In reply to Re^2: Mysql handle not in asynchronous mode by ff
in thread Mysql handle not in asynchronous mode by punkish

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