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SQLite training in Houston TX on 2019-11-05 (details)
Part of the 2019 Tcl Conference

Artifact 91a84c9b08adfc4472097d2e8deb0150214e0e76:


# 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 the VACUUM statement.
#
# $Id: vacuum2.test,v 1.10 2009/02/18 20:31:18 drh Exp $

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

# Do not use a codec for tests in this file, as the database file is
# manipulated directly using tcl scripts (using the [hexio_write] command).
#
do_not_use_codec

# If the VACUUM statement is disabled in the current build, skip all
# the tests in this file.
#
ifcapable {!vacuum||!autoinc} {
  finish_test
  return
}
if $AUTOVACUUM {
  finish_test
  return
}

# Ticket #1121 - make sure vacuum works if all autoincrement tables
# have been deleted.
#
do_test vacuum2-1.1 {
  execsql {
    CREATE TABLE t1(x INTEGER PRIMARY KEY AUTOINCREMENT, y);
    DROP TABLE t1;
    VACUUM;
  }
} {}

# Ticket #2518.  Make sure vacuum increments the change counter
# in the database header.
#
do_test vacuum2-2.1 {
  execsql {
    CREATE TABLE t1(x);
    CREATE TABLE t2(y);
    INSERT INTO t1 VALUES(1);
  }
  hexio_get_int [hexio_read test.db 24 4]
} [expr {[hexio_get_int [hexio_read test.db 24 4]]+3}]
do_test vacuum2-2.1 {
  execsql {
    VACUUM
  }
  hexio_get_int [hexio_read test.db 24 4]
} [expr {[hexio_get_int [hexio_read test.db 24 4]]+1}]

############################################################################
# Verify that we can use the auto_vacuum pragma to request a new
# autovacuum setting, do a VACUUM, and the new setting takes effect.
# Make sure this happens correctly even if there are multiple open
# connections to the same database file.
#
sqlite3 db2 test.db
set pageSize [db eval {pragma page_size}]

# We are currently not autovacuuming so the database should be 3 pages
# in size.  1 page for each of sqlite_master, t1, and t2.
#
do_test vacuum2-3.1 {
  execsql {
    INSERT INTO t1 VALUES('hello');
    INSERT INTO t2 VALUES('out there');
  }
  expr {[file size test.db]/$pageSize}
} {3}
set cksum [cksum]
do_test vacuum2-3.2 {
  cksum db2
} $cksum

# Convert the database to an autovacuumed database.
ifcapable autovacuum {
  do_test vacuum2-3.3 {
    execsql {
      PRAGMA auto_vacuum=FULL;
      VACUUM;
    }
    expr {[file size test.db]/$pageSize}
  } {4}
}
do_test vacuum2-3.4 {
  cksum db2
} $cksum
do_test vacuum2-3.5 {
  cksum
} $cksum
do_test vacuum2-3.6 {
  execsql {PRAGMA integrity_check} db2
} {ok}
do_test vacuum2-3.7 {
  execsql {PRAGMA integrity_check} db
} {ok}

# Convert the database back to a non-autovacuumed database.
do_test vacuum2-3.13 {
  execsql {
    PRAGMA auto_vacuum=NONE;
    VACUUM;
  }
  expr {[file size test.db]/$pageSize}
} {3}
do_test vacuum2-3.14 {
  cksum db2
} $cksum
do_test vacuum2-3.15 {
  cksum
} $cksum
do_test vacuum2-3.16 {
  execsql {PRAGMA integrity_check} db2
} {ok}
do_test vacuum2-3.17 {
  execsql {PRAGMA integrity_check} db
} {ok}

db2 close

ifcapable autovacuum {
  do_test vacuum2-4.1 {
    db close
    file delete -force test.db
    sqlite3 db test.db
    execsql {
      pragma auto_vacuum=1;
      create table t(a, b);
      insert into t values(1, 2);
      insert into t values(1, 2);
      pragma auto_vacuum=0;
      vacuum;
      pragma auto_vacuum;
    }
  } {0}
  do_test vacuum2-4.2 {
    execsql {
      pragma auto_vacuum=1;
      vacuum;
      pragma auto_vacuum;
    }
  } {1}
  do_test vacuum2-4.3 {
    execsql {
      pragma integrity_check
    }
  } {ok}
  do_test vacuum2-4.4 {
    db close
    sqlite3 db test.db
    execsql {
      pragma auto_vacuum;
    }
  } {1}
  do_test vacuum2-4.5 {  # Ticket #3663
    execsql {
      pragma auto_vacuum=2;
      vacuum;
      pragma auto_vacuum;
    }
  } {2}
  do_test vacuum2-4.6 {
    execsql {
      pragma integrity_check
    }
  } {ok}
  do_test vacuum2-4.7 {
    db close
    sqlite3 db test.db
    execsql {
      pragma auto_vacuum;
    }
  } {2}
}


#-------------------------------------------------------------------------
# The following block of tests verify the behaviour of the library when
# a database is VACUUMed when there are one or more unfinalized SQL 
# statements reading the same database using the same db handle.
#
db close
forcedelete test.db
sqlite3 db test.db
do_execsql_test vacuum2-5.1 {
  CREATE TABLE t1(a PRIMARY KEY, b UNIQUE);
  INSERT INTO t1 VALUES(1, randomblob(500));
  INSERT INTO t1 SELECT a+1, randomblob(500) FROM t1;      -- 2
  INSERT INTO t1 SELECT a+2, randomblob(500) FROM t1;      -- 4 
  INSERT INTO t1 SELECT a+4, randomblob(500) FROM t1;      -- 8 
  INSERT INTO t1 SELECT a+8, randomblob(500) FROM t1;      -- 16 
} {}

do_test vacuum2-5.2 {
  list [catch {
    db eval {SELECT a, b FROM t1} { if {$a == 8} { execsql VACUUM } }
  } msg] $msg
} {1 {cannot VACUUM - SQL statements in progress}}

do_test vacuum2-5.3 {
  list [catch {
    db eval {SELECT 1, 2, 3} { execsql VACUUM }
  } msg] $msg
} {1 {cannot VACUUM - SQL statements in progress}}

do_test vacuum2-5.4 {
  set res ""
  set res2 ""
  db eval {SELECT a, b FROM t1 WHERE a<=10} {
    if {$a==6} { set res [catchsql VACUUM] }
    lappend res2 $a
  }
  lappend res2 $res
} {1 2 3 4 5 6 7 8 9 10 {1 {cannot VACUUM - SQL statements in progress}}}


finish_test