# 2007 October 23

#

# 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 implements regression tests for SQLite library.  The

# focus of this script is measuring executing speed. More specifically,

# the focus is on the speed of:

#

#   * joins

#   * views

#   * sub-selects

#   * triggers

#

# $Id: speed4p.explain,v 1.1 2008/04/16 12:57:48 drh Exp $

#

set testdir [file dirname $argv0]

source $testdir/tester.tcl

speed_trial_init speed1

# Set a uniform random seed

expr srand(0)

set sqlout [open speed1.txt w]

proc tracesql {sql} {

  puts $::sqlout $sql\;

}

#db trace tracesql

# 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

}

# Summary of tests:

#

#   speed4p-join1: Join three tables using IPK index.

#   speed4p-join2: Join three tables using an index.

#   speed4p-join3: Join two tables without an index.

#

#   speed4p-view1:  Querying a view.

#   speed4p-table1: Same queries as in speed4p-view1, but run directly against

#                  the tables for comparison purposes.

#

#   speed4p-subselect1: A SELECT statement that uses many sub-queries..

#

#   speed4p-trigger1: An INSERT statement that fires a trigger.

#   speed4p-trigger2: An UPDATE statement that fires a trigger.

#   speed4p-trigger3: A DELETE statement that fires a trigger.

#   speed4p-notrigger1: Same operation as trigger1, but without the trigger.

#   speed4p-notrigger2:        "          trigger2           "

#   speed4p-notrigger3:        "          trigger3           "

#

# Set up the schema. Each of the tables t1, t2 and t3 contain 50,000 rows.

# This creates a database of around 16MB.

execsql {

  PRAGMA page_size=1024;

  PRAGMA cache_size=8192;

  PRAGMA locking_mode=EXCLUSIVE;

  BEGIN;

  CREATE TABLE t1(rowid INTEGER PRIMARY KEY, i INTEGER, t TEXT);

  CREATE TABLE t2(rowid INTEGER PRIMARY KEY, i INTEGER, t TEXT);

  CREATE TABLE t3(rowid INTEGER PRIMARY KEY, i INTEGER, t TEXT);

  CREATE VIEW v1 AS SELECT rowid, i, t FROM t1;

  CREATE VIEW v2 AS SELECT rowid, i, t FROM t2;

  CREATE VIEW v3 AS SELECT rowid, i, t FROM t3;

}

for {set jj 1} {$jj <= 3} {incr jj} {

  set stmt [string map "%T% t$jj" {INSERT INTO %T% VALUES(NULL, $i, $t)}]

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

    set i [expr {int(rand()*50000)}]

    set t [number_name $i]

    execsql $stmt

  }

}

execsql {

  CREATE INDEX i1 ON t1(t);

  CREATE INDEX i2 ON t2(t);

  CREATE INDEX i3 ON t3(t);

  COMMIT;

}

# Before running these tests, disable the compiled statement cache built into

# the Tcl interface. This is because we want to test the speed of SQL

# compilation as well as execution.

#

db cache size 0

# Join t1, t2, t3 on IPK.

set sql "SELECT * FROM t1, t2, t3 WHERE t1.oid = t2.oid AND t2.oid = t3.oid"

explain $sql

speed_trial speed4p-join1 50000 row $sql

# Join t1, t2, t3 on the non-IPK index.

set sql "SELECT * FROM t1, t2, t3 WHERE t1.t = t2.t AND t2.t = t3.t"

explain $sql

speed_trial speed4p-join2 50000 row $sql

# Run 10000 simple queries against the views.

set script {

  for {set ii 1} {$ii < 10000} {incr ii} {

    set v [expr {$ii*3}]

    set t [expr {$ii%3+1}]

    db eval "SELECT * FROM v$t WHERE rowid = \$v"

  }

}

explain {SELECT * FROm v1 WHERE rowid=$v}

speed_trial_tcl speed4p-view1 10000 stmt $script

# Run the same 10000 simple queries as in the previous test case against

# the underlying tables. The compiled vdbe programs should be identical, so

# the only difference in running time is the extra time taken to compile

# the view definitions.

#

set script {

  for {set ii 1} {$ii < 10000} {incr ii} {

    set v [expr {$ii*3}]

    set t [expr {$ii%3+1}]

    db eval "SELECT t FROM t$t WHERE rowid = \$v"

  }

}

explain {SELECT * FROM t1 WHERE rowid=$v}

speed_trial_tcl speed4p-table1 10000 stmt $script

# Run a SELECT that uses sub-queries 10000 times. A total of 30000 sub-selects.

#

set script {

  for {set ii 1} {$ii < 10000} {incr ii} {

    set v [expr {$ii*3}]

    db eval {

      SELECT (SELECT t FROM t1 WHERE rowid = $v), 

             (SELECT t FROM t2 WHERE rowid = $v), 

             (SELECT t FROM t3 WHERE rowid = $v)

    }

  }

}

explain {

      SELECT (SELECT t FROM t1 WHERE rowid = $v), 

             (SELECT t FROM t2 WHERE rowid = $v), 

             (SELECT t FROM t3 WHERE rowid = $v)

}

speed_trial_tcl speed4p-subselect1 10000 stmt $script

# The following block tests the speed of some DML statements that cause

# triggers to fire.

#

execsql {

  CREATE TABLE log(op TEXT, r INTEGER, i INTEGER, t TEXT);

  CREATE TABLE t4(rowid INTEGER PRIMARY KEY, i INTEGER, t TEXT);

  CREATE TRIGGER t4_trigger1 AFTER INSERT ON t4 BEGIN

    INSERT INTO log VALUES('INSERT INTO t4', new.rowid, new.i, new.t);

  END;

  CREATE TRIGGER t4_trigger2 AFTER UPDATE ON t4 BEGIN

    INSERT INTO log VALUES('UPDATE OF t4', new.rowid, new.i, new.t);

  END;

  CREATE TRIGGER t4_trigger3 AFTER DELETE ON t4 BEGIN

    INSERT INTO log VALUES('DELETE OF t4', old.rowid, old.i, old.t);

  END;

  BEGIN;

}

set list {}

for {set ii 1} {$ii < 10000} {incr ii} {

  lappend list $ii [number_name $ii]

}

set script {

  foreach {ii name} $::list {

    db eval {INSERT INTO t4 VALUES(NULL, $ii, $name)}

  }

}

explain {INSERT INTO t4 VALUES(NULL, $ii, $name)}

speed_trial_tcl speed4p-trigger1 10000 stmt $script

set list {}

for {set ii 1} {$ii < 20000} {incr ii 2} {

  set ii2 [expr {$ii*2}]

  lappend list $ii $ii2 [number_name $ii2]

}

set script {

  foreach {ii ii2 name} $::list {

    db eval {

      UPDATE t4 SET i = $ii2, t = $name WHERE rowid = $ii;

    }

  }

}

explain {UPDATE t4 SET i = $ii2, t = $name WHERE rowid = $ii}

speed_trial_tcl speed4p-trigger2 10000 stmt $script

set script {

  for {set ii 1} {$ii < 20000} {incr ii 2} {

    db eval {DELETE FROM t4 WHERE rowid = $ii}

  }

}

explain {DELETE FROM t4 WHERE rowid = $ii}

speed_trial_tcl speed4p-trigger3 10000 stmt $script

execsql {COMMIT}

# The following block contains the same tests as the above block that

# tests triggers, with one crucial difference: no triggers are defined.

# So the difference in speed between these tests and the preceding ones

# is the amount of time taken to compile and execute the trigger programs.

#

execsql {

  DROP TABLE t4;

  DROP TABLE log;

  VACUUM;

  CREATE TABLE t4(rowid INTEGER PRIMARY KEY, i INTEGER, t TEXT);

  BEGIN;

}

set list {}

for {set ii 1} {$ii < 10000} {incr ii} {

  lappend list $ii [number_name $ii]

}

set script {

  foreach {ii name} $::list {

    db eval {INSERT INTO t4 VALUES(NULL, $ii, $name);}

  }

}

explain {INSERT INTO t4 VALUES(NULL, $ii, $name)}

speed_trial_tcl speed4p-notrigger1 10000 stmt $script

set list {}

for {set ii 1} {$ii < 20000} {incr ii 2} {

  set ii2 [expr {$ii*2}]

  lappend list $ii $ii2 [number_name $ii2]

}

set script {

  foreach {ii ii2 name} $::list {

    db eval {

      UPDATE t4 SET i = $ii2, t = $name WHERE rowid = $ii;

    }

  }

}

explain {UPDATE t4 SET i = $ii2, t = $name WHERE rowid = $ii}

speed_trial_tcl speed4p-notrigger2 10000 stmt $script

set script {

  for {set ii 1} {$ii < 20000} {incr ii 2} {

    db eval {DELETE FROM t4 WHERE rowid = $ii}

  }

}

explain {DELETE FROM t4 WHERE rowid = $ii}

speed_trial_tcl speed4p-notrigger3 10000 stmt $script

execsql {COMMIT}

speed_trial_summary speed4

finish_test