Beefy Boxes and Bandwidth Generously Provided by pair Networks
Do you know where your variables are?
 
PerlMonks  

Re^2: DBI Style Inquiry

by Tux (Monsignor)
on Jun 27, 2013 at 12:08 UTC ( #1041000=note: print w/ replies, xml ) Need Help??


in reply to Re: DBI Style Inquiry
in thread DBI Style Inquiry

But fetchrow_hashref is much slower than the other fetch methods. It doesn't really matter if you fetch just a single row, but when traversing thousands of records, you will notice. For speed use bind_columns (the last example of that section shows how to get the best of both worlds). Here are some (older) speed compares for different database types:


Enjoy, Have FUN! H.Merijn


Comment on Re^2: DBI Style Inquiry
Select or Download Code
Replies are listed 'Best First'.
Re^3: DBI Style Inquiry
by Ralesk (Pilgrim) on Jun 27, 2013 at 12:20 UTC

    Nice comparison. Would have probably been more interesting to see a graph that isnít anchored on hashref = 100% though.

Re^3: DBI Style Inquiry
by erix (Vicar) on Jun 28, 2013 at 12:14 UTC

    I am surprised by the difference (even if it's small) between fetch and fetchrow_arrayref (your BC and DBC), as DBI docs say:

    "fetchrow_arrayref" $ary_ref = $sth->fetchrow_arrayref; $ary_ref = $sth->fetch; # alias

    Or is the essential difference something else?

    (Also, it would be interesting to have the DBMS version-numbers on those pages; it does say 2006, that's a long time ago. I would say that (arguably, no doubt) PostgreSQL has advanced more than the others in performance in this particular period)

      The difference between BC and DBC is the method-call overhead. If you really want to squeze out nonoseconds per call, it matters. It is not something I would propagate in use though:

      Create table 5000 x 12 Dbindcol 660153.156 recs/sec 4.8 x faster DBC bindcol 633472.697 recs/sec 4.6 x faster BC Darrayref 563380.282 recs/sec 4.1 x faster DAR arrayref 525486.075 recs/sec 3.8 x faster AR array 227086.929 recs/sec 1.7 x faster A hashref 136836.344 recs/sec HR

      Enjoy, Have FUN! H.Merijn

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1041000]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others making s'mores by the fire in the courtyard of the Monastery: (7)
As of 2015-07-08 03:57 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (94 votes), past polls