# 2008 March 21

 #

 # 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.  

 #

 # This is a copy of speed1.test modified to user prepared statements.

 #

 # $Id: speed1p.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

 }

 # Create a database schema.

 #

 do_test speed1p-1.0 {

   execsql {

     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);

   }

   execsql {

     SELECT name FROM sqlite_master ORDER BY 1;

   }

 } {i2a i2b t1 t2}

 # 50000 INSERTs on an unindexed table

 #

 set list {}

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

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

   set x [number_name $r]

   lappend list $i $r $x

 }

 set script {

   foreach {i r x} $::list {

     db eval {INSERT INTO t1 VALUES($i,$r,$x)}

   }

 }

 explain {INSERT INTO t1 VALUES($i,$r,$x)}

 db eval BEGIN

 speed_trial_tcl speed1p-insert1 50000 row $script

 db eval COMMIT

 # 50000 INSERTs on an indexed table

 #

 set list {}

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

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

   set x [number_name $r]

   lappend list $i $r $x

 }

 set script {

   foreach {i r x} $::list {

     db eval {INSERT INTO t2 VALUES($i,$r,$x)}

   }

 }

 explain {INSERT INTO t2 VALUES($i,$r,$x)}

 db eval BEGIN

 speed_trial_tcl speed1p-insert2 50000 row $script

 db eval COMMIT

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

 # a full table scan is required.

 #

 set list {}

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

   set lwr [expr {$i*100}]

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

   lappend list $lwr $upr

 }

 set script {

   foreach {lwr upr} $::list {

     db eval  {SELECT count(*), avg(b) FROM t1 WHERE b>=$lwr AND b<$upr}

   }

 }

 explain {SELECT count(*), avg(b) FROM t1 WHERE b>=$lwr AND b<$upr}

 db eval BEGIN

 speed_trial_tcl speed1p-select1 [expr {50*50000}] row $script

 db eval COMMIT

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

 # table scan is required.

 #

 set list {}

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

   lappend list "%[number_name $i]%"

 }

 set script {

   foreach pattern $::list {

     db eval {SELECT count(*), avg(b) FROM t1 WHERE c LIKE $pattern}

   }

 }

 explain {SELECT count(*), avg(b) FROM t1 WHERE c LIKE $pattern}

 db eval BEGIN

 speed_trial_tcl speed1p-select2 [expr {50*50000}] row $script

 db eval COMMIT

 # Create indices

 #

 explain {CREATE INDEX i1a ON t1(a)}

 explain {CREATE INDEX i1b ON t1(b)}

 db eval BEGIN

 speed_trial speed1p-createidx 150000 row {

   CREATE INDEX i1a ON t1(a);

   CREATE INDEX i1b ON t1(b);

   CREATE INDEX i1c ON t1(c);

 }

 db eval COMMIT

 # 5000 SELECTs on an integer comparison where the integer is

 # indexed.

 #

 set list {}

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

   set lwr [expr {$i*100}]

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

   lappend list $lwr $upr

 }

 set script {

   foreach {lwr upr} $::list {

     db eval {SELECT count(*), avg(b) FROM t1 WHERE b>=$lwr AND b<$upr}

   }

 }

 explain {SELECT count(*), avg(b) FROM t1 WHERE b>=$lwr AND b<$upr}

 db eval BEGIN

 speed_trial_tcl speed1p-select3 5000 stmt $script

 db eval COMMIT

 # 100000 random SELECTs against rowid.

 #

 set list {}

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

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

   lappend list $id

 }

 set script {

   foreach id $::list {

     db eval {SELECT c FROM t1 WHERE rowid=$id}

   }

 }

 explain {SELECT c FROM t1 WHERE rowid=$id}

 db eval BEGIN

 speed_trial_tcl speed1p-select4 100000 row $script

 db eval COMMIT

 # 100000 random SELECTs against a unique indexed column.

 #

 set list {}

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

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

   lappend list $id

 }

 set script {

   foreach id $::list {

     db eval {SELECT c FROM t1 WHERE a=$id}

   }

 }

 explain {SELECT c FROM t1 WHERE a=$id}

 db eval BEGIN

 speed_trial_tcl speed1p-select5 100000 row $script

 db eval COMMIT

 # 50000 random SELECTs against an indexed column text column

 #

 set list [db eval {SELECT c FROM t1 ORDER BY random() LIMIT 50000}]

 set script {

   foreach c $::list {

     db eval {SELECT c FROM t1 WHERE c=$c}

   }

 }

 explain {SELECT c FROM t1 WHERE c=$c}

 db eval BEGIN

 speed_trial_tcl speed1p-select6 50000 row $script

 db eval COMMIT

 # Vacuum

 speed_trial speed1p-vacuum 100000 row VACUUM

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

 #

 set list {}

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

   set lwr [expr {$i*2}]

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

   lappend list $lwr $upr

 }

 set script {

   foreach {lwr upr} $::list {

     db eval {UPDATE t1 SET b=b*2 WHERE a>=$lwr AND a<$upr}

   }

 }

 explain {UPDATE t1 SET b=b*2 WHERE a>=$lwr AND a<$upr}

 db eval BEGIN

 speed_trial_tcl speed1p-update1 5000 stmt $script

 db eval COMMIT

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

 #

 set list {}

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

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

   lappend list $i $r

 }

 set script {

   foreach {i r} $::list {

     db eval {UPDATE t1 SET b=$r WHERE a=$i}

   }

 }

 explain {UPDATE t1 SET b=$r WHERE a=$i}

 db eval BEGIN

 speed_trial_tcl speed1p-update2 50000 row $script

 db eval COMMIT

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

 #

 explain {UPDATE t1 SET c=a}

 speed_trial speed1p-update3 50000 row {

   UPDATE t1 SET c=a;

 }

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

 # touched through an index.

 #

 set list {}

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

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

   lappend list $i [number_name $r]

 }

 set script {

   foreach {i x} $::list {

     db eval {UPDATE t1 SET c=$x WHERE a=$i}

   }

 }

 explain {UPDATE t1 SET c=$x WHERE a=$i}

 db eval BEGIN

 speed_trial_tcl speed1p-update4 50000 row $script

 db eval COMMIT

 # Delete all content in a table.

 #

 explain {DELETE FROM t1}

 speed_trial speed1p-delete1 50000 row {DELETE FROM t1}

 # Copy one table into another

 #

 explain {INSERT INTO t1 SELECT * FROM t2}

 speed_trial speed1p-copy1 50000 row {INSERT INTO t1 SELECT * FROM t2}

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

 #

 explain {DELETE FROM t1 WHERE 1}

 speed_trial speed1p-delete2 50000 row {DELETE FROM t1 WHERE 1}

 # Refill the table yet again

 #

 speed_trial speed1p-copy2 50000 row {INSERT INTO t1 SELECT * FROM t2}

 # Drop the table and recreate it without its indices.

 #

 explain {DROP TABLE t1}

 explain {CREATE TABLE tX(a INTEGER, b INTEGER, c TEXT)}

 db eval BEGIN

 speed_trial speed1p-drop1 50000 row {

    DROP TABLE t1;

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

 }

 db eval COMMIT

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

 # there are no indices to deal with.

 #

 speed_trial speed1p-copy3 50000 row {INSERT INTO t1 SELECT * FROM t2}

 # Select 20000 rows from the table at random.

 #

 explain {SELECT rowid FROM t1 ORDER BY random() LIMIT 20000}

 speed_trial speed1p-random1 50000 row {

   SELECT rowid FROM t1 ORDER BY random() LIMIT 20000

 }

 # Delete 20000 random rows from the table.

 #

 explain {DELETE FROM t1 WHERE rowid IN

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

 speed_trial speed1p-random-del1 20000 row {

   DELETE FROM t1 WHERE rowid IN

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

 }

 do_test speed1p-1.1 {

   db one {SELECT count(*) FROM t1}

 } 30000

 # Delete 20000 more rows at random from the table.

 #

 speed_trial speed1p-random-del2 20000 row {

   DELETE FROM t1 WHERE rowid IN

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

 }

 do_test speed1p-1.2 {

   db one {SELECT count(*) FROM t1}

 } 10000

 speed_trial_summary speed1

 finish_test