# 2007 August 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.
#
#***********************************************************************
#
# The focus of this file is testing some specific characteristics of the
# IO traffic generated by SQLite (making sure SQLite is not writing out
# more database pages than it has to, stuff like that).
#
set testdir [file dirname $argv0]
source $testdir/tester.tcl
db close
sqlite3_simulate_device
sqlite3 db test.db -vfs devsym
# Test summary:
#
# io-1.* - Test that quick-balance does not journal pages unnecessarily.
#
# io-2.* - Test the "atomic-write optimization".
#
# io-3.* - Test the IO traffic enhancements triggered when the
# IOCAP_SEQUENTIAL device capability flag is set (no
# fsync() calls on the journal file).
#
# io-4.* - Test the IO traffic enhancements triggered when the
# IOCAP_SAFE_APPEND device capability flag is set (fewer
# fsync() calls on the journal file, no need to set nRec
# field in the single journal header).
#
# io-5.* - Test that the default page size is selected and used
# correctly.
#
set ::nWrite 0
proc nWrite {db} {
set bt [btree_from_db $db]
db_enter $db
array set stats [btree_pager_stats $bt]
db_leave $db
set res [expr $stats(write) - $::nWrite]
set ::nWrite $stats(write)
set res
}
set ::nSync 0
proc nSync {} {
set res [expr {$::sqlite_sync_count - $::nSync}]
set ::nSync $::sqlite_sync_count
set res
}
do_test io-1.1 {
execsql {
PRAGMA auto_vacuum = OFF;
PRAGMA page_size = 1024;
CREATE TABLE abc(a,b);
}
nWrite db
} {2}
# Insert into the table 4 records of aproximately 240 bytes each.
# This should completely fill the root-page of the table. Each
# INSERT causes 2 db pages to be written - the root-page of "abc"
# and page 1 (db change-counter page).
do_test io-1.2 {
set ret [list]
execsql { INSERT INTO abc VALUES(1,randstr(230,230)); }
lappend ret [nWrite db]
execsql { INSERT INTO abc VALUES(2,randstr(230,230)); }
lappend ret [nWrite db]
execsql { INSERT INTO abc VALUES(3,randstr(230,230)); }
lappend ret [nWrite db]
execsql { INSERT INTO abc VALUES(4,randstr(230,230)); }
lappend ret [nWrite db]
} {2 2 2 2}
# Insert another 240 byte record. This causes two leaf pages
# to be added to the root page of abc. 4 pages in total
# are written to the db file - the two leaf pages, the root
# of abc and the change-counter page.
do_test io-1.3 {
execsql { INSERT INTO abc VALUES(5,randstr(230,230)); }
nWrite db
} {4}
# Insert another 3 240 byte records. After this, the tree consists of
# the root-node, which is close to empty, and two leaf pages, both of
# which are full.
do_test io-1.4 {
set ret [list]
execsql { INSERT INTO abc VALUES(6,randstr(230,230)); }
lappend ret [nWrite db]
execsql { INSERT INTO abc VALUES(7,randstr(230,230)); }
lappend ret [nWrite db]
execsql { INSERT INTO abc VALUES(8,randstr(230,230)); }
lappend ret [nWrite db]
} {2 2 2}
# This insert should use the quick-balance trick to add a third leaf
# to the b-tree used to store table abc. It should only be necessary to
# write to 3 pages to do this: the change-counter, the root-page and
# the new leaf page.
do_test io-1.5 {
execsql { INSERT INTO abc VALUES(9,randstr(230,230)); }
nWrite db
} {3}
ifcapable atomicwrite {
#----------------------------------------------------------------------
# Test cases io-2.* test the atomic-write optimization.
#
do_test io-2.1 {
execsql { DELETE FROM abc; VACUUM; }
} {}
# Clear the write and sync counts.
nWrite db ; nSync
# The following INSERT updates 2 pages and requires 4 calls to fsync():
#
# 1) The directory in which the journal file is created,
# 2) The journal file (to sync the page data),
# 3) The journal file (to sync the journal file header),
# 4) The database file.
#
do_test io-2.2 {
execsql { INSERT INTO abc VALUES(1, 2) }
list [nWrite db] [nSync]
} {2 4}
# Set the device-characteristic mask to include the SQLITE_IOCAP_ATOMIC,
# then do another INSERT similar to the one in io-2.2. This should
# only write 1 page and require a single fsync().
#
# The single fsync() is the database file. Only one page is reported as
# written because page 1 - the change-counter page - is written using
# an out-of-band method that bypasses the write counter.
#
sqlite3_simulate_device -char atomic
do_test io-2.3 {
execsql { INSERT INTO abc VALUES(3, 4) }
list [nWrite db] [nSync]
} {1 1}
# Test that the journal file is not created and the change-counter is
# updated when the atomic-write optimization is used.
#
do_test io-2.4.1 {
execsql {
BEGIN;
INSERT INTO abc VALUES(5, 6);
}
sqlite3 db2 test.db -vfs devsym
execsql { SELECT * FROM abc } db2
} {1 2 3 4}
do_test io-2.4.2 {
file exists test.db-journal
} {0}
do_test io-2.4.3 {
execsql { COMMIT }
execsql { SELECT * FROM abc } db2
} {1 2 3 4 5 6}
db2 close
# Test that the journal file is created and sync()d if the transaction
# modifies more than one database page, even if the IOCAP_ATOMIC flag
# is set.
#
do_test io-2.5.1 {
execsql { CREATE TABLE def(d, e) }
nWrite db ; nSync
execsql {
BEGIN;
INSERT INTO abc VALUES(7, 8);
}
file exists test.db-journal
} {0}
do_test io-2.5.2 {
execsql { INSERT INTO def VALUES('a', 'b'); }
file exists test.db-journal
} {1}
do_test io-2.5.3 {
execsql { COMMIT }
list [nWrite db] [nSync]
} {3 4}
# Test that the journal file is created and sync()d if the transaction
# modifies a single database page and also appends a page to the file.
# Internally, this case is handled differently to the one above. The
# journal file is not actually created until the 'COMMIT' statement
# is executed.
#
# Changed 2010-03-27: The size of the database is now stored in
# bytes 28..31 and so when a page is added to the database, page 1
# is immediately modified and the journal file immediately comes into
# existance. To fix this test, the BEGIN is changed into a a
# BEGIN IMMEDIATE and the INSERT is omitted.
#
do_test io-2.6.1 {
execsql {
BEGIN IMMEDIATE;
-- INSERT INTO abc VALUES(9, randstr(1000,1000));
}
file exists test.db-journal
} {0}
do_test io-2.6.2 {
# Create a file at "test.db-journal". This will prevent SQLite from
# opening the journal for exclusive access. As a result, the COMMIT
# should fail with SQLITE_CANTOPEN and the transaction rolled back.
#
file mkdir test.db-journal
catchsql {
INSERT INTO abc VALUES(9, randstr(1000,1000));
COMMIT
}
} {1 {unable to open database file}}
do_test io-2.6.3 {
forcedelete test.db-journal
catchsql { COMMIT }
} {0 {}}
do_test io-2.6.4 {
execsql { SELECT * FROM abc }
} {1 2 3 4 5 6 7 8}
# Test that if the database modification is part of multi-file commit,
# the journal file is always created. In this case, the journal file
# is created during execution of the COMMIT statement, so we have to
# use the same technique to check that it is created as in the above
# block.
forcedelete test2.db test2.db-journal
ifcapable attach {
do_test io-2.7.1 {
execsql {
ATTACH 'test2.db' AS aux;
PRAGMA aux.page_size = 1024;
CREATE TABLE aux.abc2(a, b);
BEGIN;
INSERT INTO abc VALUES(9, 10);
}
file exists test.db-journal
} {0}
do_test io-2.7.2 {
execsql { INSERT INTO abc2 SELECT * FROM abc }
file exists test2.db-journal
} {0}
do_test io-2.7.3 {
execsql { SELECT * FROM abc UNION ALL SELECT * FROM abc2 }
} {1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10}
do_test io-2.7.4 {
file mkdir test2.db-journal
catchsql { COMMIT }
} {1 {unable to open database file}}
do_test io-2.7.5 {
forcedelete test2.db-journal
catchsql { COMMIT }
} {1 {cannot commit - no transaction is active}}
do_test io-2.7.6 {
execsql { SELECT * FROM abc UNION ALL SELECT * FROM abc2 }
} {1 2 3 4 5 6 7 8}
}
# Try an explicit ROLLBACK before the journal file is created.
#
do_test io-2.8.1 {
execsql {
BEGIN;
DELETE FROM abc;
}
file exists test.db-journal
} {0}
do_test io-2.8.2 {
execsql { SELECT * FROM abc }
} {}
do_test io-2.8.3 {
execsql {
ROLLBACK;
SELECT * FROM abc;
}
} {1 2 3 4 5 6 7 8}
# Test that the atomic write optimisation is not enabled if the sector
# size is larger than the page-size.
#
do_test io-2.9.1 {
db close
sqlite3 db test.db
sqlite3_simulate_device -char atomic -sectorsize 2048
execsql {
BEGIN;
INSERT INTO abc VALUES(9, 10);
}
file exists test.db-journal
} {1}
do_test io-2.9.2 {
execsql { ROLLBACK; }
db close
forcedelete test.db test.db-journal
sqlite3 db test.db -vfs devsym
execsql {
PRAGMA auto_vacuum = OFF;
PRAGMA page_size = 2048;
CREATE TABLE abc(a, b);
}
execsql {
BEGIN;
INSERT INTO abc VALUES(9, 10);
}
file exists test.db-journal
} {0}
do_test io-2.9.3 {
execsql { COMMIT }
} {}
# Test a couple of the more specific IOCAP_ATOMIC flags
# (i.e IOCAP_ATOMIC2K etc.).
#
do_test io-2.10.1 {
sqlite3_simulate_device -char atomic1k
execsql {
BEGIN;
INSERT INTO abc VALUES(11, 12);
}
file exists test.db-journal
} {1}
do_test io-2.10.2 {
execsql { ROLLBACK }
sqlite3_simulate_device -char atomic2k
execsql {
BEGIN;
INSERT INTO abc VALUES(11, 12);
}
file exists test.db-journal
} {0}
do_test io-2.10.3 {
execsql { ROLLBACK }
} {}
do_test io-2.11.0 {
execsql {
PRAGMA locking_mode = exclusive;
PRAGMA locking_mode;
}
} {exclusive exclusive}
do_test io-2.11.1 {
execsql {
INSERT INTO abc VALUES(11, 12);
}
file exists test.db-journal
} {0}
do_test io-2.11.2 {
execsql {
PRAGMA locking_mode = normal;
INSERT INTO abc VALUES(13, 14);
}
file exists test.db-journal
} {0}
} ;# /* ifcapable atomicwrite */
#----------------------------------------------------------------------
# Test cases io-3.* test the IOCAP_SEQUENTIAL optimization.
#
sqlite3_simulate_device -char sequential -sectorsize 0
ifcapable pager_pragmas {
do_test io-3.1 {
db close
forcedelete test.db test.db-journal
sqlite3 db test.db -vfs devsym
db eval {
PRAGMA auto_vacuum=OFF;
}
# File size might be 1 due to the hack to work around ticket #3260.
# Search for #3260 in os_unix.c for additional information.
expr {[file size test.db]>1}
} {0}
do_test io-3.2 {
execsql { CREATE TABLE abc(a, b) }
nSync
execsql {
PRAGMA temp_store = memory;
PRAGMA cache_size = 10;
BEGIN;
INSERT INTO abc VALUES('hello', 'world');
INSERT INTO abc SELECT * FROM abc;
INSERT INTO abc SELECT * FROM abc;
INSERT INTO abc SELECT * FROM abc;
INSERT INTO abc SELECT * FROM abc;
INSERT INTO abc SELECT * FROM abc;
INSERT INTO abc SELECT * FROM abc;
INSERT INTO abc SELECT * FROM abc;
INSERT INTO abc SELECT * FROM abc;
INSERT INTO abc SELECT * FROM abc;
INSERT INTO abc SELECT * FROM abc;
INSERT INTO abc SELECT * FROM abc;
}
# File has grown - showing there was a cache-spill - but there
# have been no calls to fsync(). The file is probably about 30KB.
# But some VFS implementations (symbian) buffer writes so the actual
# size may be a little less than that. So this test case just tests
# that the file is now greater than 20000 bytes in size.
list [expr [file size test.db]>20000] [nSync]
} {1 0}
do_test io-3.3 {
# The COMMIT requires a single fsync() - to the database file.
execsql { COMMIT }
list [file size test.db] [nSync]
} {39936 1}
}
#----------------------------------------------------------------------
# Test cases io-4.* test the IOCAP_SAFE_APPEND optimization.
#
sqlite3_simulate_device -char safe_append
# With the SAFE_APPEND flag set, simple transactions require 3, rather
# than 4, calls to fsync(). The fsync() calls are on:
#
# 1) The directory in which the journal file is created, (unix only)
# 2) The journal file (to sync the page data),
# 3) The database file.
#
# Normally, when the SAFE_APPEND flag is not set, there is another fsync()
# on the journal file between steps (2) and (3) above.
#
set expected_sync_count 2
if {$::tcl_platform(platform)=="unix"} {
ifcapable dirsync {
incr expected_sync_count
}
}
do_test io-4.1 {
execsql { DELETE FROM abc }
nSync
execsql { INSERT INTO abc VALUES('a', 'b') }
nSync
} $expected_sync_count
# With SAFE_APPEND set, the nRec field of the journal file header should
# be set to 0xFFFFFFFF before the first journal sync. The nRec field
# occupies bytes 8-11 of the journal file.
#
do_test io-4.2.1 {
execsql { BEGIN }
execsql { INSERT INTO abc VALUES('c', 'd') }
file exists test.db-journal
} {1}
if {$::tcl_platform(platform)=="unix"} {
do_test io-4.2.2 {
hexio_read test.db-journal 8 4
} {FFFFFFFF}
}
do_test io-4.2.3 {
execsql { COMMIT }
nSync
} $expected_sync_count
sqlite3_simulate_device -char safe_append
# With SAFE_APPEND set, there should only ever be one journal-header
# written to the database, even though the sync-mode is "full".
#
do_test io-4.3.1 {
execsql {
INSERT INTO abc SELECT * FROM abc;
INSERT INTO abc SELECT * FROM abc;
INSERT INTO abc SELECT * FROM abc;
INSERT INTO abc SELECT * FROM abc;
INSERT INTO abc SELECT * FROM abc;
INSERT INTO abc SELECT * FROM abc;
INSERT INTO abc SELECT * FROM abc;
INSERT INTO abc SELECT * FROM abc;
INSERT INTO abc SELECT * FROM abc;
INSERT INTO abc SELECT * FROM abc;
INSERT INTO abc SELECT * FROM abc;
}
expr {[file size test.db]/1024}
} {43}
ifcapable pager_pragmas {
do_test io-4.3.2 {
execsql {
PRAGMA synchronous = full;
PRAGMA cache_size = 10;
PRAGMA synchronous;
}
} {2}
}
do_test io-4.3.3 {
execsql {
BEGIN;
UPDATE abc SET a = 'x';
}
file exists test.db-journal
} {1}
if {$tcl_platform(platform) != "symbian"} {
# This test is not run on symbian because the file-buffer makes it
# difficult to predict the exact size of the file as reported by
# [file size].
do_test io-4.3.4 {
# The UPDATE statement in the statement above modifies 41 pages
# (all pages in the database except page 1 and the root page of
# abc). Because the cache_size is set to 10, this must have required
# at least 4 cache-spills. If there were no journal headers written
# to the journal file after the cache-spill, then the size of the
# journal file is give by:
#
# <jrnl file size> = <jrnl header size> + nPage * (<page-size> + 8)
#
# If the journal file contains additional headers, this formula
# will not predict the size of the journal file.
#
file size test.db-journal
} [expr 512 + (1024+8)*41]
}
#----------------------------------------------------------------------
# Test cases io-5.* test that the default page size is selected and
# used correctly.
#
set tn 0
foreach {char sectorsize pgsize} {
{} 512 1024
{} 1024 1024
{} 2048 2048
{} 8192 8192
{} 16384 8192
{atomic} 512 8192
{atomic512} 512 1024
{atomic2K} 512 2048
{atomic2K} 4096 4096
{atomic2K atomic} 512 8192
{atomic64K} 512 1024
} {
incr tn
if {$pgsize>$::SQLITE_MAX_PAGE_SIZE} continue
db close
forcedelete test.db test.db-journal
sqlite3_simulate_device -char $char -sectorsize $sectorsize
sqlite3 db test.db -vfs devsym
db eval {
PRAGMA auto_vacuum=OFF;
}
ifcapable !atomicwrite {
if {[regexp {^atomic} $char]} continue
}
do_test io-5.$tn {
execsql {
CREATE TABLE abc(a, b, c);
}
expr {[file size test.db]/2}
} $pgsize
}
sqlite3_simulate_device -char {} -sectorsize 0
finish_test
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