author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Fri, 22 Jan 2010 11:06:30 +0200 | |
changeset 0 | 08ec8eefde2f |
permissions | -rw-r--r-- |
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# 2007 April 12 |
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# |
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# The author disclaims copyright to this source code. In place of |
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# a legal notice, here is a blessing: |
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# |
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# May you do good and not evil. |
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# May you find forgiveness for yourself and forgive others. |
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# May you share freely, never taking more than you give. |
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# |
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#*********************************************************************** |
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# This file implements regression tests for SQLite library. |
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# The focus of the tests in this file are to verify that the |
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# pager optimizations implemented in version 3.3.14 work. |
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# |
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# $Id: pageropt.test,v 1.5 2008/08/20 14:49:25 danielk1977 Exp $ |
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|
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set testdir [file dirname $argv0] |
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source $testdir/tester.tcl |
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|
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ifcapable {!pager_pragmas||secure_delete} { |
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finish_test |
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return |
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} |
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# Run the SQL statement supplied by the argument and return |
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# the results. Prepend four integers to the beginning of the |
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# result which are |
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# |
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# (1) The number of page reads from the database |
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# (2) The number of page writes to the database |
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# (3) The number of page writes to the journal |
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# (4) The number of cache pages freed |
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# |
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proc pagercount_sql {sql {db db}} { |
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global sqlite3_pager_readdb_count |
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global sqlite3_pager_writedb_count |
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global sqlite3_pager_writej_count |
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global sqlite3_pager_pgfree_count |
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set sqlite3_pager_readdb_count 0 |
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set sqlite3_pager_writedb_count 0 |
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set sqlite3_pager_writej_count 0 |
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set r [$db eval $sql] |
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set cnt [list $sqlite3_pager_readdb_count \ |
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$sqlite3_pager_writedb_count \ |
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$sqlite3_pager_writej_count ] |
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return [concat $cnt $r] |
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} |
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# Setup the test database |
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# |
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do_test pageropt-1.1 { |
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sqlite3_soft_heap_limit 0 |
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execsql { |
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PRAGMA auto_vacuum = OFF; |
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PRAGMA page_size = 1024; |
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} |
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pagercount_sql { |
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CREATE TABLE t1(x); |
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} |
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} {0 2 0} |
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do_test pageropt-1.2 { |
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pagercount_sql { |
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INSERT INTO t1 VALUES(randomblob(5000)); |
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} |
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} {0 6 2} |
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|
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# Verify that values remain in cache on for subsequent reads. |
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# We should not have to go back to disk. |
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# |
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do_test pageropt-1.3 { |
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pagercount_sql { |
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SELECT length(x) FROM t1 |
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} |
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} {0 0 0 5000} |
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# If another thread reads the database, the original cache |
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# remains valid. |
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# |
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sqlite3 db2 test.db |
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set blobcontent [db2 one {SELECT hex(x) FROM t1}] |
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do_test pageropt-1.4 { |
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pagercount_sql { |
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SELECT hex(x) FROM t1 |
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} |
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} [list 0 0 0 $blobcontent] |
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|
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# But if the other thread modifies the database, then the cache |
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# must refill. |
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# |
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do_test pageropt-1.5 { |
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db2 eval {CREATE TABLE t2(y)} |
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pagercount_sql { |
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SELECT hex(x) FROM t1 |
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} |
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} [list 6 0 0 $blobcontent] |
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do_test pageropt-1.6 { |
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pagercount_sql { |
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SELECT hex(x) FROM t1 |
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} |
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} [list 0 0 0 $blobcontent] |
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|
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# Verify that the last page of an overflow chain is not read from |
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# disk when deleting a row. The one row of t1(x) has four pages |
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104 |
# of overflow. So deleting that row from t1 should involve reading |
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105 |
# the sqlite_master table (1 page) the main page of t1 (1 page) and |
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106 |
# the three overflow pages of t1 for a total of 5 pages. |
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107 |
# |
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108 |
# Pages written are page 1 (for the freelist pointer), the root page |
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109 |
# of the table, and one of the overflow chain pointers because it |
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110 |
# becomes the trunk of the freelist. Total 3. |
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111 |
# |
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112 |
do_test pageropt-2.1 { |
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113 |
db close |
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114 |
sqlite3 db test.db |
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115 |
pagercount_sql { |
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116 |
DELETE FROM t1 WHERE rowid=1 |
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117 |
} |
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118 |
} {5 3 3} |
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119 |
|
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120 |
# When pulling pages off of the freelist, there is no reason |
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121 |
# to actually bring in the old content. |
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122 |
# |
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123 |
do_test pageropt-2.2 { |
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124 |
db close |
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125 |
sqlite3 db test.db |
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126 |
pagercount_sql { |
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127 |
INSERT INTO t1 VALUES(randomblob(1500)); |
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128 |
} |
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129 |
} {3 4 3} |
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130 |
do_test pageropt-2.3 { |
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131 |
pagercount_sql { |
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132 |
INSERT INTO t1 VALUES(randomblob(1500)); |
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133 |
} |
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134 |
} {0 4 3} |
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135 |
|
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136 |
# Note the new optimization that when pulling the very last page off of the |
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137 |
# freelist we do not read the content of that page. |
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138 |
# |
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139 |
do_test pageropt-2.4 { |
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140 |
pagercount_sql { |
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141 |
INSERT INTO t1 VALUES(randomblob(1500)); |
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142 |
} |
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143 |
} {0 5 3} |
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144 |
|
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145 |
# Appending a large quantity of data does not involve writing much |
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146 |
# to the journal file. |
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147 |
# |
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148 |
do_test pageropt-3.1 { |
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149 |
pagercount_sql { |
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150 |
INSERT INTO t2 SELECT * FROM t1; |
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151 |
} |
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152 |
} {1 7 2} |
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153 |
|
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154 |
# Once again, we do not need to read the last page of an overflow chain |
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155 |
# while deleting. |
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156 |
# |
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157 |
do_test pageropt-3.2 { |
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158 |
pagercount_sql { |
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159 |
DROP TABLE t2; |
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160 |
} |
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161 |
} {0 2 3} |
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|
162 |
do_test pageropt-3.3 { |
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163 |
pagercount_sql { |
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164 |
DELETE FROM t1; |
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165 |
} |
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|
166 |
} {0 3 3} |
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Revision: 201003
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|
167 |
|
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Revision: 201003
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|
168 |
# There are now 11 pages on the freelist. Move them all into an |
08ec8eefde2f
Revision: 201003
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|
169 |
# overflow chain by inserting a single large record. Starting from |
08ec8eefde2f
Revision: 201003
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|
170 |
# a cold cache, only page 1, the root page of table t1, and the trunk |
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Revision: 201003
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|
171 |
# of the freelist need to be read (3 pages). And only those three |
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Revision: 201003
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|
172 |
# pages need to be journalled. But 13 pages need to be written: |
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Revision: 201003
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|
173 |
# page1, the root page of table t1, and an 11 page overflow chain. |
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|
174 |
# |
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Revision: 201003
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|
175 |
do_test pageropt-4.1 { |
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Revision: 201003
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176 |
db close |
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Revision: 201003
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177 |
sqlite3 db test.db |
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Revision: 201003
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|
178 |
pagercount_sql { |
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Revision: 201003
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179 |
INSERT INTO t1 VALUES(randomblob(11300)) |
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180 |
} |
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181 |
} {3 13 3} |
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|
182 |
|
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Revision: 201003
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|
183 |
# Now we delete that big entries starting from a cold cache and an |
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Revision: 201003
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|
184 |
# empty freelist. The first 10 of the 11 pages overflow chain have |
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Revision: 201003
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|
185 |
# to be read, together with page1 and the root of the t1 table. 12 |
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Revision: 201003
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|
186 |
# reads total. But only page1, the t1 root, and the trunk of the |
08ec8eefde2f
Revision: 201003
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|
187 |
# freelist need to be journalled and written back. |
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Revision: 201003
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188 |
# |
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Revision: 201003
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189 |
do_test pageropt-4.2 { |
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Revision: 201003
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190 |
db close |
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Revision: 201003
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191 |
sqlite3 db test.db |
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192 |
pagercount_sql { |
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Revision: 201003
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193 |
DELETE FROM t1 |
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194 |
} |
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195 |
} {12 3 3} |
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|
196 |
|
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197 |
sqlite3_soft_heap_limit $soft_limit |
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Revision: 201003
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198 |
catch {db2 close} |
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Revision: 201003
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199 |
finish_test |