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SQLite training in Houston TX on 2019-11-05 (details)
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Overview
Comment:Add speed-test scripts that also show EXPLAIN output. (CVS 5017)
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: d11f5dafdaf7c18c43615d0ac018c7d221460244
User & Date: drh 2008-04-16 12:57:48
Context
2008-04-16
12:58
Add tests to verify that strings may use embedded zero characters. Ticket #3056. (CVS 5018) check-in: bb0f9e92 user: drh tags: trunk
12:57
Add speed-test scripts that also show EXPLAIN output. (CVS 5017) check-in: d11f5daf user: drh tags: trunk
00:49
Make sure the database connection mutex is held before calling sqlite3SafetyOn() or sqlite3SafetyOff(). Ticket #3059. (CVS 5016) check-in: d35dea05 user: drh tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

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# 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

Added test/speed4p.explain.























































































































































































































































































































































































































































































































































































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# 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