[sqlite] Remove obsolete reference version 3.8.7.4.

third_party/sqlite/sqlite-src-3080704/test/pageropt.test

-# 2007 April 12
-#
-# 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 the tests in this file are to verify that the
-# pager optimizations implemented in version 3.3.14 work.
-#
-# $Id: pageropt.test,v 1.5 2008/08/20 14:49:25 danielk1977 Exp $
-
-set testdir [file dirname $argv0]
-source $testdir/tester.tcl
-
-ifcapable {!pager_pragmas||secure_delete||direct_read} {
-  finish_test
-  return
-}
-
-# Run the SQL statement supplied by the argument and return
-# the results.  Prepend four integers to the beginning of the
-# result which are
-#
-#     (1)  The number of page reads from the database
-#     (2)  The number of page writes to the database
-#     (3)  The number of page writes to the journal
-#     (4)  The number of cache pages freed
-#
-proc pagercount_sql {sql {db db}} {
-  global sqlite3_pager_readdb_count
-  global sqlite3_pager_writedb_count
-  global sqlite3_pager_writej_count
-  global sqlite3_pager_pgfree_count
-  set sqlite3_pager_readdb_count 0
-  set sqlite3_pager_writedb_count 0
-  set sqlite3_pager_writej_count 0
-  set r [$db eval $sql]
-  set cnt [list $sqlite3_pager_readdb_count \
-                $sqlite3_pager_writedb_count \
-                $sqlite3_pager_writej_count ]
-  return [concat $cnt $r]
-}
-
-# Setup the test database
-#
-do_test pageropt-1.1 {
-  sqlite3_soft_heap_limit 0
-  execsql {
-    PRAGMA auto_vacuum = OFF;
-    PRAGMA page_size = 1024;
-  }
-  pagercount_sql {
-    CREATE TABLE t1(x);
-  }
-} {0 2 0}
-do_test pageropt-1.2 {
-  pagercount_sql {
-    INSERT INTO t1 VALUES(randomblob(5000));
-  }
-} {0 6 2}
-
-# Verify that values remain in cache on for subsequent reads.
-# We should not have to go back to disk.
-#
-do_test pageropt-1.3 {
-  pagercount_sql {
-    SELECT length(x) FROM t1
-  }
-} {0 0 0 5000}
-
-# If another thread reads the database, the original cache
-# remains valid.
-#
-sqlite3 db2 test.db
-set blobcontent [db2 one {SELECT hex(x) FROM t1}]
-do_test pageropt-1.4 {
-  pagercount_sql {
-    SELECT hex(x) FROM t1
-  }
-} [list 0 0 0 $blobcontent]
-
-# But if the other thread modifies the database, then the cache
-# must refill.
-#
-ifcapable mmap {
-  set x [expr {[permutation]=="mmap" ? 1 : 6}]
-} else {
-  set x 6
-}
-do_test pageropt-1.5 {
-  db2 eval {CREATE TABLE t2(y)}
-  pagercount_sql {
-    SELECT hex(x) FROM t1
-  }
-} [list $x 0 0 $blobcontent]
-do_test pageropt-1.6 {
-  pagercount_sql {
-    SELECT hex(x) FROM t1
-  }
-} [list 0 0 0 $blobcontent]
-
-# Verify that the last page of an overflow chain is not read from
-# disk when deleting a row.  The one row of t1(x) has four pages
-# of overflow.  So deleting that row from t1 should involve reading
-# the sqlite_master table (1 page) the main page of t1 (1 page) and
-# the three overflow pages of t1 for a total of 5 pages.
-#
-# Pages written are page 1 (for the freelist pointer), the root page
-# of the table, and one of the overflow chain pointers because it
-# becomes the trunk of the freelist.  Total 3.
-#
-do_test pageropt-2.1 {
-  db close
-  sqlite3 db test.db
-  pagercount_sql {
-    DELETE FROM t1 WHERE rowid=1
-  }
-} {5 3 3}
-
-# When pulling pages off of the freelist, there is no reason
-# to actually bring in the old content.
-#
-do_test pageropt-2.2 {
-  db close
-  sqlite3 db test.db
-  pagercount_sql {
-    INSERT INTO t1 VALUES(randomblob(1500));
-  }
-} {3 4 3}
-do_test pageropt-2.3 {
-  pagercount_sql {
-    INSERT INTO t1 VALUES(randomblob(1500));
-  }
-} {0 4 3}
-
-# Note the new optimization that when pulling the very last page off of the
-# freelist we do not read the content of that page.
-#
-do_test pageropt-2.4 {
-  pagercount_sql {
-    INSERT INTO t1 VALUES(randomblob(1500));
-  }
-} {0 5 3}
-
-# Appending a large quantity of data does not involve writing much
-# to the journal file.
-#
-do_test pageropt-3.1 {
-  pagercount_sql {
-    INSERT INTO t2 SELECT * FROM t1;
-  }
-} {1 7 2}
-
-# Once again, we do not need to read the last page of an overflow chain
-# while deleting.
-#
-do_test pageropt-3.2 {
-  pagercount_sql {
-    DROP TABLE t2;
-  }
-} {0 2 3}
-do_test pageropt-3.3 {
-  pagercount_sql {
-    DELETE FROM t1;
-  }
-} {0 3 3}
-
-# There are now 11 pages on the freelist.  Move them all into an
-# overflow chain by inserting a single large record.  Starting from
-# a cold cache, only page 1, the root page of table t1, and the trunk
-# of the freelist need to be read (3 pages).  And only those three
-# pages need to be journalled.  But 13 pages need to be written:
-# page1, the root page of table t1, and an 11 page overflow chain.
-#
-do_test pageropt-4.1 {
-  db close
-  sqlite3 db test.db
-  pagercount_sql {
-    INSERT INTO t1 VALUES(randomblob(11300))
-  }
-} {3 13 3}
-
-# Now we delete that big entries starting from a cold cache and an
-# empty freelist.  The first 10 of the 11 pages overflow chain have
-# to be read, together with page1 and the root of the t1 table.  12
-# reads total.  But only page1, the t1 root, and the trunk of the
-# freelist need to be journalled and written back.
-#
-do_test pageropt-4.2 {
-  db close
-  sqlite3 db test.db
-  pagercount_sql {
-    DELETE FROM t1
-  }
-} {12 3 3}
-
-sqlite3_soft_heap_limit $cmdlinearg(soft-heap-limit)
-catch {db2 close}
-finish_test