# 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