sqlite/test/vacuummem.test

# 2005 February 15
#
# 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 file is testing that the VACUUM statement correctly
# frees any memory used for a temporary cache.
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl
set testprefix vacuummem

if {[permutation]=="memsubsys1"} {
  finish_test
  return
}

# If ENABLE_MEMORY_MANAGEMENT is defined, when VACUUM is run the temp db
# is able to borrow space from the main db (and it does, because the
# temp db is configure with a very small cache). When the VACUUM is
# finished and the temp db closed, all the page-cache memory currently 
# assigned to the temp db is freed. If ENABLE_MEMORY_MANAGEMENT is defined
# this causes the total memory usage to drop much more than expected,
# causing tests in this file to fail.
#
ifcapable memorymanage {
  finish_test
  return
}


proc memory_used {} { 
  set stat [sqlite3_status SQLITE_STATUS_MEMORY_USED 1]  
  lindex $stat 1
}

do_execsql_test 1.0 {
  PRAGMA cache_size = -2000;
  CREATE TABLE t1(a, b, c);

  WITH r(i) AS (
    SELECT 1 UNION ALL SELECT i+1 FROM r WHERE i<100000
  )
  INSERT INTO t1 SELECT randomblob(100),randomblob(100),randomblob(100) FROM r;

  CREATE INDEX t1a ON t1(a);
  CREATE INDEX t1b ON t1(b);
  CREATE INDEX t1c ON t1(c);
}
set ans "#/[memory_used]/"

do_test 1.1 { memory_used } $ans

do_execsql_test 1.2 VACUUM

do_test 1.3 { memory_used } $ans

do_execsql_test 1.4 {
  SELECT count(*) FROM t1 WHERE +a IS NOT NULL
} {100000}

do_test 1.5 { memory_used } $ans



finish_test