From: drh <drh@noemail.net>
Date: Wed, 16 Apr 2008 12:57:48 +0000 (+0000)
Subject: Add speed-test scripts that also show EXPLAIN output. (CVS 5017)
X-Git-Tag: version-3.6.10~1160
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=4c68e6d28a7ff1bede2de487f0523cb4b952ec79;p=thirdparty%2Fsqlite.git

Add speed-test scripts that also show EXPLAIN output. (CVS 5017)

FossilOrigin-Name: d11f5dafdaf7c18c43615d0ac018c7d221460244
---

diff --git a/manifest b/manifest
index 59d2c11b73..57ce75588e 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Make\ssure\sthe\sdatabase\sconnection\smutex\sis\sheld\sbefore\scalling\nsqlite3SafetyOn()\sor\ssqlite3SafetyOff().\s\sTicket\s#3059.\s(CVS\s5016)
-D 2008-04-16T00:49:12
+C Add\sspeed-test\sscripts\sthat\salso\sshow\sEXPLAIN\soutput.\s(CVS\s5017)
+D 2008-04-16T12:57:48
 F Makefile.arm-wince-mingw32ce-gcc ac5f7b2cef0cd850d6f755ba6ee4ab961b1fadf7
 F Makefile.in 25b3282a4ac39388632c2fb0e044ff494d490952
 F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
@@ -442,10 +442,12 @@ F test/soak.test 64f9b27fbcdec43335a88c546ce1983e6ba40d7b
 F test/softheap1.test c9146eda576eedb62192b771293a2115d9af8456
 F test/sort.test 0e4456e729e5a92a625907c63dcdedfbe72c5dc5
 F test/speed1.test 22e1b27af0683ed44dcd2f93ed817a9c3e65084a
+F test/speed1p.explain d841e650a04728b39e6740296b852dccdca9b2cb
 F test/speed1p.test 5f79987671f930a8aa651091c2952c1782b0df83
 F test/speed2.test 53177056baf6556dcbdcf032bbdfc41c1aa74ded
 F test/speed3.test e312d7e442a5047d730569fdae2ba99bc94e1a13
 F test/speed4.test 20d8ea20bea3ca09c3ef3b5ec820a17e58e132cb
+F test/speed4p.explain 6b5f104ebeb34a038b2f714150f51d01143e59aa
 F test/speed4p.test 0e51908951677de5a969b723e03a27a1c45db38b
 F test/sqllimits1.test 68f7eab0bfc27ef68d677864d37e37e38f67db00
 F test/subquery.test 8203f85db56ba022a57a0589890090c8feed4e59
@@ -630,7 +632,7 @@ F www/tclsqlite.tcl 8be95ee6dba05eabcd27a9d91331c803f2ce2130
 F www/vdbe.tcl 87a31ace769f20d3627a64fa1fade7fed47b90d0
 F www/version3.tcl 890248cf7b70e60c383b0e84d77d5132b3ead42b
 F www/whentouse.tcl fc46eae081251c3c181bd79c5faef8195d7991a5
-P cce8deae2d556916e2817e0cb9748dceb162085d
-R 7a340507e41c10c8a2cb1cddf539eada
+P d35dea059e2cb936e4277f513f036b9b0bdfc4a5
+R c0b22004b0ac521d974e7b893302fd7e
 U drh
-Z ea939e8bf0d325aad906011ffe8ec67e
+Z 1ac53e97ed99016f506aa1047f716fd9
diff --git a/manifest.uuid b/manifest.uuid
index 03d55f9b67..97a61951aa 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-d35dea059e2cb936e4277f513f036b9b0bdfc4a5
\ No newline at end of file
+d11f5dafdaf7c18c43615d0ac018c7d221460244
\ No newline at end of file
diff --git a/test/speed1p.explain b/test/speed1p.explain
new file mode 100644
index 0000000000..e32feddf30
--- /dev/null
+++ b/test/speed1p.explain
@@ -0,0 +1,366 @@
+# 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
diff --git a/test/speed4p.explain b/test/speed4p.explain
new file mode 100644
index 0000000000..a713955e61
--- /dev/null
+++ b/test/speed4p.explain
@@ -0,0 +1,283 @@
+# 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