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+# 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 1.3 2007/08/12 20:07:59 drh Exp $
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+ifcapable {!pager_pragmas} {
+  finish_test
+  return
+}
+
+# Run the SQL statement supplied by the argument and return
+# the results.  Prepend four integers to the beginning of the
+# result which are
+#
+#     (1)  The number of page reads from the database
+#     (2)  The number of page writes to the database
+#     (3)  The number of page writes to the journal
+#     (4)  The number of cache pages freed
+#
+proc pagercount_sql {sql {db db}} {
+  global sqlite3_pager_readdb_count
+  global sqlite3_pager_writedb_count
+  global sqlite3_pager_writej_count
+  global sqlite3_pager_pgfree_count
+  set sqlite3_pager_readdb_count 0
+  set sqlite3_pager_writedb_count 0
+  set sqlite3_pager_writej_count 0
+  set sqlite3_pager_pgfree_count 0
+  set r [$db eval $sql]
+  set cnt [list $sqlite3_pager_readdb_count \
+                $sqlite3_pager_writedb_count \
+                $sqlite3_pager_writej_count \
+                $sqlite3_pager_pgfree_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 0}
+do_test pageropt-1.2 {
+  pagercount_sql {
+    INSERT INTO t1 VALUES(randomblob(5000));
+  }
+} {0 6 2 0}
+
+# 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 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 0 $blobcontent]
+
+# But if the other thread modifies the database, then the cache
+# must refill.
+#
+do_test pageropt-1.5 {
+  db2 eval {CREATE TABLE t2(y)}
+  pagercount_sql {
+    SELECT hex(x) FROM t1
+  }
+} [list 6 0 0 6 $blobcontent]
+do_test pageropt-1.6 {
+  pagercount_sql {
+    SELECT hex(x) FROM t1
+  }
+} [list 0 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 0}
+
+# 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 0}
+do_test pageropt-2.3 {
+  pagercount_sql {
+    INSERT INTO t1 VALUES(randomblob(1500));
+  }
+} {0 4 3 0}
+
+# 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 0}
+
+# 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 0}
+
+# 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 0}
+do_test pageropt-3.3 {
+  pagercount_sql {
+    DELETE FROM t1;
+  }
+} {0 3 3 0}
+
+# 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 0}
+
+# 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 pageroot-4.2 {
+  db close
+  sqlite3 db test.db
+  pagercount_sql {
+    DELETE FROM t1
+  }
+} {12 3 3 0}
+
+sqlite3_soft_heap_limit $soft_limit
+catch {db2 close}
+finish_test