Created
July 17, 2009 15:09
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If you have a column with a foreign key constraint, and no index, then whenever anything is deleted from the target table it has to do a table scan. This will show you columns that might cause this error. pg_dump -s databaseName | findMissingFKIndexes.pl
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| #!/usr/bin/perl | |
| my $DEBUG=0; | |
| my %indexes = (); | |
| my %keys = (); | |
| my $last = ""; | |
| while(<>) { | |
| if (/^CREATE INDEX.*ON (\S+) USING btree \((\S+)(,.*)?\)/) { | |
| print "INDEX $1 $2\n" if $DEBUG; | |
| $indexes{"$1 $2"} = 1; | |
| } | |
| if (/ADD CONSTRAINT \S+ PRIMARY KEY \((\S+)(,.*)?\)/) { | |
| my $column = $1; | |
| $last =~ /TABLE ONLY (\S+)/; | |
| print "PK $1 $column\n" if $DEBUG; | |
| $indexes{"$1 $column"} = 1; | |
| } | |
| if (/ADD CONSTRAINT \S+ FOREIGN KEY \((\S+)\)/) { | |
| my $column = $1; | |
| $last =~ /TABLE ONLY (\S+)/; | |
| print "FK $1 $column\n" if $DEBUG; | |
| $keys{"$1 $column"} = 1; | |
| } | |
| $last = $_; | |
| } | |
| for my $fk (keys %keys) { | |
| print "MISSING: $fk\n" unless $indexes{$fk}; | |
| } |
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