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95 lines
3.3 KiB
Perl
Executable File
95 lines
3.3 KiB
Perl
Executable File
#!/usr/bin/perl
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# This is a test with uses two processes to a database.
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# The other inserts records in two tables, the other does a lot of joins
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# on these.
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# Every time the read thread outputs info, it does a ALTER TABLE command
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# which should stop the insert thread until the ALTER TABLE command is ready.
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#
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# Warning, the output from this test will differ in 'found' from time to time,
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# but there should never be any errors
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#
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$host = shift || "";
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$test_db="test";
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$test_count=10000;
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srand 0; # Repeatable test
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use Mysql;
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$|= 1; # Autoflush
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$dbh = Mysql->Connect($host) || die "Can't connect: $Mysql::db_errstr\n";
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$dbh->SelectDB($test_db) || die "Can't use database $test_db: $Mysql::db_errstr\n";
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$firsttable = "test_lock_1";
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$secondtable = "test_lock_2";
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$dbh->Query("drop table $firsttable");
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$dbh->Query("drop table $secondtable");
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print "Creating tables $firsttable and $secondtable in database $test_db\n";
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$dbh->Query("create table $firsttable (id int(6) not null, info char(32), auto int(11) not null auto_increment, primary key(id),key(auto))") or die $Mysql::db_errstr;
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$dbh->Query("create table $secondtable (id int(6) not null, info varchar(32), key(id))") or die $Mysql::db_errstr;
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$dbh=0; # Close handler
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if (fork() == 0)
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{ # Insert process
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$dbh = Mysql->Connect($host) || die "Can't connect: $Mysql::db_errstr\n";
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$dbh->SelectDB($test_db) || die "Can't use database $test_db: $Mysql::db_errstr\n";
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$first_id=1; $second_id=1;
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$first_count=$second_count=0;
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print "Writing started\n";
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for ($i=1 ; $i <= $test_count ; $i++)
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{
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if (rand(3) <= 1)
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{
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$sth=$dbh->Query("insert into $firsttable values ($first_id,'This is entry $i',NULL)") || die "Got error on insert: $Mysql::db_errstr\n";
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die "Row not inserted, aborting\n" if ($sth->affected_rows != 1);
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$first_id++;
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$first_count++;
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}
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else
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{
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$sth=$dbh->Query("insert into $secondtable values ($second_id,'This is entry $i')") || die "Got error on insert: $Mysql::db_errstr\n";
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die "Row not inserted, aborting\n" if ($sth->affected_rows != 1);
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$second_id++ if (rand(10) <= 1); # Don't always count it up
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$second_count++;
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}
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print "Write: $i\n" if ($i % 1000 == 0);
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}
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print "Writing done ($first_count $second_count)\n";
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}
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else
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{
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$dbh = Mysql->Connect($host) || die "Can't connect: $Mysql::db_errstr\n";
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$dbh->SelectDB($test_db) || die "Can't use database $test_db: $Mysql::db_errstr\n";
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$locked=$found=0;
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print "Reading started\n";
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for ($i=1 ; $i <= $test_count ; $i++)
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{
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$id=int(rand($test_count)/3)+1;
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$sth=$dbh->Query("select count(*) from $firsttable,$secondtable where $firsttable.id = $secondtable.id and $firsttable.id=$id") || die "Got error on select: $Mysql::db_errstr\n";
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$found++ if ($sth->numrows);
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if ($i % 1000 == 0)
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{
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print "Read: $i Found: $found\n";
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if ($found)
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{
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$locked=1-$locked;
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if ($locked)
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{
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$sth=$dbh->Query("lock tables $firsttable write,$secondtable write");
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}
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$sth=$dbh->Query("alter table $firsttable CHANGE id id int(6) not null") || die "Got error on ALTER TABLE: $Mysql::db_errstr\n";
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$sth=$dbh->Query("alter table $secondtable CHANGE info info char(32) not null") || die "Got error on ALTER TABLE: $Mysql::db_errstr\n";
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if ($locked)
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{
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$sth=$dbh->Query("unlock tables");
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}
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}
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}
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}
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print "Reading done Found: $found\n";
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}
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