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# See the file LICENSE for redistribution information.
#
# Copyright (c) 2006-2009 Oracle. All rights reserved.
#
# $Id$
#
# TEST test121
# TEST Tests of multi-version concurrency control.
# TEST
# TEST MVCC and cursor adjustment.
# TEST Set up a -snapshot cursor and position it in the middle
# TEST of a database.
# TEST Write to the database, both before and after the cursor,
# TEST and verify that it stays on the same position.
proc test121 { method {tnum "121"} args } {
source ./include.tcl
# This test needs its own env.
set eindex [lsearch -exact $args "-env"]
if { $eindex != -1 } {
incr eindex
set env [lindex $args $eindex]
puts "Test$tnum skipping for env $env"
return
}
# MVCC is not allowed with queue methods.
if { [is_queue $method] == 1 } {
puts "Test$tnum skipping for method $method"
return
}
puts "\tTest$tnum ($method): MVCC and cursor adjustment."
set args [convert_args $method $args]
set omethod [convert_method $method]
set encargs ""
set args [split_encargs $args encargs]
set filename "test.db"
set pageargs ""
set args [split_pageargs $args pageargs]
# Create transactional env. Specifying -multiversion makes
# all databases opened within the env -multiversion.
env_cleanup $testdir
puts "\tTest$tnum.a: Creating txn env."
# Raise cachesize so this test focuses on cursor adjustment
# and not on small cache issues.
set cachesize [expr 2 * 1024 * 1024]
set max_locks 2000
set max_objects 2000
set env [eval {berkdb_env -create -cachesize "0 $cachesize 1"}\
-lock_max_locks $max_locks -lock_max_objects $max_objects\
-txn -multiversion $encargs $pageargs -home $testdir]
error_check_good env_open [is_valid_env $env] TRUE
# Open database.
puts "\tTest$tnum.b: Creating -multiversion db."
set db [eval {berkdb_open} \
-create -auto_commit -env $env $omethod $args $pageargs $filename]
error_check_good db_open [is_valid_db $db] TRUE
# Start transactions.
puts "\tTest$tnum.c: Start txns with -snapshot."
set t1 [$env txn -snapshot]
set txn1 "-txn $t1"
# Enter some data using txn1. Leave holes, by using keys
# 2, 4, 6 ....
set niter 10000
set data DATA
for { set i 1 } { $i <= $niter } { incr i } {
set key [expr $i * 2]
error_check_good t1_put [eval {$db put} $txn1 $key $data.$key] 0
}
error_check_good t1_commit [$t1 commit] 0
# Open a read-only cursor.
set t2 [$env txn -snapshot]
set txn2 "-txn $t2"
set cursor [eval {$db cursor} $txn2]
error_check_good db_cursor [is_valid_cursor $cursor $db] TRUE
# Walk the cursor halfway through the database.
set i 1
set halfway [expr $niter / 2]
for { set ret [$cursor get -first] } \
{ $i <= $halfway } \
{ set ret [$cursor get -next] } {
incr i
}
set currentkey [lindex [lindex $ret 0] 0]
set currentdata [lindex [lindex $ret 0] 1]
# Start a new transaction and use it to enter more data.
# Verify that the cursor is not changed.
puts "\tTest$tnum.c: Enter more data."
set t1 [$env txn -snapshot]
set txn1 "-txn $t1"
# Enter more data, filling in the holes from the first
# time around by using keys 1, 3, 5 .... Cursor should
# stay on the same item.
for { set i 1 } { $i <= $niter } { incr i } {
set key [expr [expr $i * 2] - 1]
error_check_good t1_put [eval {$db put} $txn1 $key $data.$key] 0
set ret [$cursor get -current]
set k [lindex [lindex $ret 0] 0]
set d [lindex [lindex $ret 0] 1]
error_check_good current_key $k $currentkey
error_check_good current_data $d $currentdata
}
error_check_good t1_commit [$t1 commit] 0
error_check_good cursor_close [$cursor close] 0
error_check_good t2_commit [$t2 commit] 0
# Clean up.
error_check_good db_close [$db close] 0
error_check_good env_close [$env close] 0
}
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