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Re^2: How to insert 30-50K rows into MySQL DB using DBI?

by huck (Parson)
on Oct 03, 2018 at 00:17 UTC ( #1223436=note: print w/replies, xml ) Need Help??


in reply to Re: How to insert 30-50K rows into MySQL DB using DBI?
in thread [SOLVED]: How to insert 30-50K rows into MySQL DB using DBI?

ill be back

When i needed to insert 10's of K records across a network interface i found the above method still too slow since there was an overhead for each sql call. so i went with something like this instead.

#!/usr/bin/perl -w use warnings; use strict; use DBI; use Data::Dumper; use POSIX qw( strftime ); my $database = 'db_name'; my $db_user = 'user'; my $db_password = 'pwd'; my $db_hostname = 'db_hostname'; my $dbh2 = DBI->connect("DBI:mysql:database=$database:host=$db_hostnam +e",$db_user,$db_password, { RaiseError => 1, AutoCommit => 1, mysql_auto_reconnect => 1 } # +Added AutoCommit => 1, mysql_auto_reconnect => 1 while trying to make + it work ); die "unable to connect to server $DBI::errstr" unless $dbh2; my $sql2_1000 = q^ INSERT INTO table_name (col_1, col_2, col_3, col_4, col_5) VALUES ^; $sql2_1000.=' (?,?,?,?,?) 'x1000; my $sth2_1000 = $dbh2->prepare($sql2_1000); my $grp=0; $dbh2->begin_work; my @list=(); while(my @row = $sth1->fetchrow_array){ $grp++; if ($grp>1000) { $dbh2->commit; $dbh2->begin_work; $sth2_1000->execute(@list); $grp=1; @list=(); # edit/add } unless ($row[3]) {$row[3]=undef;} push @list,$row[0],$row[1],$row[2],$row[3],$row[4]; } $dbh2->commit; my $sql2_n = q^ INSERT INTO table_name (col_1, col_2, col_3, col_4, col_5) VALUES ^; my $n=scalar(@list)/5; $sql2_n.=' (?,?,?,?,?) ' x $n; my $sth2_n = $dbh2->prepare($sql2_n); $dbh2->begin_work; $sth2_n->execute(@list); $dbh2->commit; $sth1->finish(); $dbh2->disconnect();
notice the batching of rows per sql call, and the final creation of a insert of the exact length.

Both of these are untested code for example sake only, your mileage may vary.

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