# 2008 October 9

#

# The author disclaims copyright to this source code. In place of

# a legal notice, here is a blessing:

#

# May you do good and not evil.

# May you find forgiveness for yourself and forgive others.

# May you share freely, never taking more than you give.

#

#*************************************************************************

# This file generates SQL text used for performance testing.

#

# $Id: mkspeedsql.tcl,v 1.1 2008/10/09 17:57:34 drh Exp $

#

# Set a uniform random seed

expr srand(0)

# The number_name procedure below converts its argment (an integer)

# into a string which is the English-language name for that number.

#

# Example:

#

# puts [number_name 123] -> "one hundred twenty three"

#

set ones {zero one two three four five six seven eight nine

ten eleven twelve thirteen fourteen fifteen sixteen seventeen

eighteen nineteen}

set tens {{} ten twenty thirty forty fifty sixty seventy eighty ninety}

proc number_name {n} {

if {$n>=1000} {

set txt "[number_name [expr {$n/1000}]] thousand"

set n [expr {$n%1000}]

} else {

set txt {}

}

if {$n>=100} {

append txt " [lindex $::ones [expr {$n/100}]] hundred"

set n [expr {$n%100}]

}

if {$n>=20} {

append txt " [lindex $::tens [expr {$n/10}]]"

set n [expr {$n%10}]

}

if {$n>0} {

append txt " [lindex $::ones $n]"

}

set txt [string trim $txt]

if {$txt==""} {set txt zero}

return $txt

}

# Create a database schema.

#

puts {

PRAGMA page_size=1024;

PRAGMA cache_size=8192;

PRAGMA locking_mode=EXCLUSIVE;

CREATE TABLE t1(a INTEGER, b INTEGER, c TEXT);

CREATE TABLE t2(a INTEGER, b INTEGER, c TEXT);

CREATE INDEX i2a ON t2(a);

CREATE INDEX i2b ON t2(b);

SELECT name FROM sqlite_master ORDER BY 1;

}

# 50000 INSERTs on an unindexed table

#

set t1c_list {}

puts {BEGIN;}

for {set i 1} {$i<=50000} {incr i} {

set r [expr {int(rand()*500000)}]

set x [number_name $r]

lappend t1c_list $x

puts "INSERT INTO t1 VALUES($i,$r,'$x');"

}

puts {COMMIT;}

# 50000 INSERTs on an indexed table

#

puts {BEGIN;}

for {set i 1} {$i<=50000} {incr i} {

set r [expr {int(rand()*500000)}]

puts "INSERT INTO t2 VALUES($i,$r,'[number_name $r]');"

}

puts {COMMIT;}

# 50 SELECTs on an integer comparison. There is no index so

# a full table scan is required.

#

for {set i 0} {$i<50} {incr i} {

set lwr [expr {$i*100}]

set upr [expr {($i+10)*100}]

puts "SELECT count(*), avg(b) FROM t1 WHERE b>=$lwr AND b<$upr;"

}

# 50 SELECTs on an LIKE comparison. There is no index so a full

# table scan is required.

#

for {set i 0} {$i<50} {incr i} {

puts "SELECT count(*), avg(b) FROM t1 WHERE c LIKE '%[number_name $i]%';"

}

# Create indices

#

puts {BEGIN;}

puts {

CREATE INDEX i1a ON t1(a);

CREATE INDEX i1b ON t1(b);

CREATE INDEX i1c ON t1(c);

}

puts {COMMIT;}

# 5000 SELECTs on an integer comparison where the integer is

# indexed.

#

set sql {}

for {set i 0} {$i<5000} {incr i} {

set lwr [expr {$i*100}]

set upr [expr {($i+10)*100}]

puts "SELECT count(*), avg(b) FROM t1 WHERE b>=$lwr AND b<$upr;"

}

# 100000 random SELECTs against rowid.

#

for {set i 1} {$i<=100000} {incr i} {

set id [expr {int(rand()*50000)+1}]

puts "SELECT c FROM t1 WHERE rowid=$id;"

}

# 100000 random SELECTs against a unique indexed column.

#

for {set i 1} {$i<=100000} {incr i} {

set id [expr {int(rand()*50000)+1}]

puts "SELECT c FROM t1 WHERE a=$id;"

}

# 50000 random SELECTs against an indexed column text column

#

set nt1c [llength $t1c_list]

for {set i 0} {$i<50000} {incr i} {

set r [expr {int(rand()*$nt1c)}]

set c [lindex $t1c_list $i]

puts "SELECT c FROM t1 WHERE c='$c';"

}

# Vacuum

puts {VACUUM;}

# 5000 updates of ranges where the field being compared is indexed.

#

puts {BEGIN;}

for {set i 0} {$i<5000} {incr i} {

set lwr [expr {$i*2}]

set upr [expr {($i+1)*2}]

puts "UPDATE t1 SET b=b*2 WHERE a>=$lwr AND a<$upr;"

}

puts {COMMIT;}

# 50000 single-row updates. An index is used to find the row quickly.

#

puts {BEGIN;}

for {set i 0} {$i<50000} {incr i} {

set r [expr {int(rand()*500000)}]

puts "UPDATE t1 SET b=$r WHERE a=$i;"

}

puts {COMMIT;}

# 1 big text update that touches every row in the table.

#

puts {

UPDATE t1 SET c=a;

}

# Many individual text updates. Each row in the table is

# touched through an index.

#

puts {BEGIN;}

for {set i 1} {$i<=50000} {incr i} {

set r [expr {int(rand()*500000)}]

puts "UPDATE t1 SET c='[number_name $r]' WHERE a=$i;"

}

puts {COMMIT;}

# Delete all content in a table.

#

puts {DELETE FROM t1;}

# Copy one table into another

#

puts {INSERT INTO t1 SELECT * FROM t2;}

# Delete all content in a table, one row at a time.

#

puts {DELETE FROM t1 WHERE 1;}

# Refill the table yet again

#

puts {INSERT INTO t1 SELECT * FROM t2;}

# Drop the table and recreate it without its indices.

#

puts {BEGIN;}

puts {

DROP TABLE t1;

CREATE TABLE t1(a INTEGER, b INTEGER, c TEXT);

}

puts {COMMIT;}

# Refill the table yet again. This copy should be faster because

# there are no indices to deal with.

#

puts {INSERT INTO t1 SELECT * FROM t2;}

# Select 20000 rows from the table at random.

#

puts {

SELECT rowid FROM t1 ORDER BY random() LIMIT 20000;

}

# Delete 20000 random rows from the table.

#

puts {

DELETE FROM t1 WHERE rowid IN

(SELECT rowid FROM t1 ORDER BY random() LIMIT 20000);

}

puts {SELECT count(*) FROM t1;}

# Delete 20000 more rows at random from the table.

#

puts {

DELETE FROM t1 WHERE rowid IN

(SELECT rowid FROM t1 ORDER BY random() LIMIT 20000);

}

puts {SELECT count(*) FROM t1;}