diff --git a/test/cases.cc b/test/cases.cc
index 023a8002..a98834a4 100644
--- a/test/cases.cc
+++ b/test/cases.cc
@@ -63,8 +63,7 @@ void testcase_setup(const char *casename, actor_params &params,
     log_notice(">>> testcase_setup(%s)", casename);
     configure_actor(last_space_id, ac_jitter, nullptr, params);
     configure_actor(last_space_id, ac_hill, nullptr, params);
-    configure_actor(last_space_id, ac_jitter, nullptr, params);
-    configure_actor(last_space_id, ac_hill, nullptr, params);
+    configure_actor(last_space_id, ac_ttl, nullptr, params);
     configure_actor(last_space_id, ac_jitter, nullptr, params);
     configure_actor(last_space_id, ac_hill, nullptr, params);
     configure_actor(last_space_id, ac_ttl, nullptr, params);
diff --git a/test/gc.sh b/test/gc.sh
deleted file mode 100755
index 9c1407f5..00000000
--- a/test/gc.sh
+++ /dev/null
@@ -1,66 +0,0 @@
-#!/bin/bash
-set -euo pipefail
-make check
-TESTDB_PREFIX=${1:-/dev/shm/mdbx-gc-test}.
-
-function rep9 { printf "%*s" $1 '' | tr ' ' '9'; }
-function join { local IFS="$1"; shift; echo "$*"; }
-function bit2option { local -n arr=$1; (( ($2&(1<<$3)) != 0 )) && echo -n '+' || echo -n '-'; echo "${arr[$3]}"; }
-
-options=(writemap coalesce lifo)
-
-function bits2list {
-	local -n arr=$1
-	local i
-	local list=()
-	for ((i=0; i<${#arr[@]}; ++i)) do
-		list[$i]=$(bit2option $1 $2 $i)
-	done
-	join , "${list[@]}"
-}
-
-function probe {
-	echo "=============================================== $(date)"
-	echo "${caption}: $*"
-	rm -f ${TESTDB_PREFIX}* \
-		&& ./mdbx_test --repeat=12 --pathname=${TESTDB_PREFIX}db "$@" | lz4 > ${TESTDB_PREFIX}log.lz4 \
-		&& ./mdbx_chk -nvvv ${TESTDB_PREFIX}db | tee ${TESTDB_PREFIX}chk \
-		&& ([ ! -e ${TESTDB_PREFIX}db-copy ] || ./mdbx_chk -nvvv ${TESTDB_PREFIX}db-copy | tee ${TESTDB_PREFIX}chk-copy) \
-		|| (echo "FAILED"; exit 1)
-}
-
-###############################################################################
-
-count=0
-for nops in {2..7}; do
-	for ((wbatch=nops-1; wbatch > 0; --wbatch)); do
-		loops=$(((333 >> nops) / nops + 3))
-		for ((rep=0; rep++ < loops; )); do
-			for ((bits=2**${#options[@]}; --bits >= 0; )); do
-				seed=$(date +%N)
-				caption="Probe #$((++count)) int-key,w/o-dups, repeat ${rep} of ${loops}" probe \
-					--pagesize=min --size=6G --table=+key.integer,-data.dups --keylen.min=min --keylen.max=max --datalen.min=min --datalen.max=1111 \
-					--nops=$( rep9 $nops ) --batch.write=$( rep9 $wbatch ) --mode=$(bits2list options $bits) \
-					--keygen.seed=${seed} basic
-				caption="Probe #$((++count)) int-key,with-dups, repeat ${rep} of ${loops}" probe \
-					--pagesize=min --size=6G --table=+key.integer,+data.dups --keylen.min=min --keylen.max=max --datalen.min=min --datalen.max=max \
-					--nops=$( rep9 $nops ) --batch.write=$( rep9 $wbatch ) --mode=$(bits2list options $bits) \
-					--keygen.seed=${seed} basic
-				caption="Probe #$((++count)) int-key,int-data, repeat ${rep} of ${loops}" probe \
-					--pagesize=min --size=6G --table=+key.integer,+data.integer --keylen.min=min --keylen.max=max --datalen.min=min --datalen.max=max \
-					--nops=$( rep9 $nops ) --batch.write=$( rep9 $wbatch ) --mode=$(bits2list options $bits) \
-					--keygen.seed=${seed} basic
-				caption="Probe #$((++count)) w/o-dups, repeat ${rep} of ${loops}" probe \
-					--pagesize=min --size=6G --table=-data.dups --keylen.min=min --keylen.max=max --datalen.min=min --datalen.max=1111 \
-					--nops=$( rep9 $nops ) --batch.write=$( rep9 $wbatch ) --mode=$(bits2list options $bits) \
-					--keygen.seed=${seed} basic
-				caption="Probe #$((++count)) with-dups, repeat ${rep} of ${loops}" probe \
-					--pagesize=min --size=6G --table=+data.dups --keylen.min=min --keylen.max=max --datalen.min=min --datalen.max=max \
-					--nops=$( rep9 $nops ) --batch.write=$( rep9 $wbatch ) --mode=$(bits2list options $bits) \
-					--keygen.seed=${seed} basic
-			done
-		done
-	done
-done
-
-echo "=== ALL DONE ====================== $(date)"
diff --git a/test/long_stochastic.sh b/test/long_stochastic.sh
new file mode 100755
index 00000000..8840b384
--- /dev/null
+++ b/test/long_stochastic.sh
@@ -0,0 +1,105 @@
+#!/bin/bash
+set -euo pipefail
+TESTDB_PREFIX=${1:-/dev/shm/mdbx-gc-test}.
+
+rm -f $(dirname ${TESTDB_PREFIX})/*
+
+if LC_ALL=C free | grep -q -i available; then
+	ram_avail_mb=$(($(LC_ALL=C free | grep -i Mem: | tr -s [:blank:] ' ' | cut -d ' ' -f 7) / 1024))
+else
+	ram_avail_mb=$(($(LC_ALL=C free | grep -i Mem: | tr -s [:blank:] ' ' | cut -d ' ' -f 4) / 1024))
+fi
+
+ram_reserve4logs_mb=3333
+if [ ${ram_avail_mb} -lt ${ram_reserve4logs_mb} ]; then
+	echo "=== At least ${ram_reserve4logs_mb}Mb RAM required"
+	exit -2
+fi
+
+#
+# В режимах отличных от MDBX_WRITEMAP изменения до записи в файл
+# будут накапливаться в памяти, что может потребовать свободной
+# памяти размером с БД. Кроме этого, в тест входит сценарий
+# создания копия БД на ходу. Поэтому БД не может быть больше 1/3
+# от доступной памяти. Однако, следует учесть что malloc() будет
+# не сразу возвращать выделенную память системе, а также
+# предусмотреть места для логов.
+#
+# In non-MDBX_WRITEMAP modes, updates (dirty pages) will
+# accumulate in memory before writing to the disk, which may
+# require a free memory up to the size of a whole database. In
+# addition, the test includes a script create a copy of the
+# database on the go. Therefore, the database cannot be more 1/3
+# of available memory. Moreover, should be taken into account
+# that malloc() will not return the allocated memory to the
+# system immediately, as well some space is required for logs.
+#
+db_size=$(expr '(' ${ram_avail_mb} - ${ram_reserve4logs_mb} ')' / 4)M
+echo "=== ${ram_avail_mb}M RAM available, use ${db_size} for DB"
+
+make check
+rm -f $(dirname ${TESTDB_PREFIX})/*
+
+###############################################################################
+
+function rep9 { printf "%*s" $1 '' | tr ' ' '9'; }
+function join { local IFS="$1"; shift; echo "$*"; }
+function bit2option { local -n arr=$1; (( ($2&(1<<$3)) != 0 )) && echo -n '+' || echo -n '-'; echo "${arr[$3]}"; }
+
+options=(writemap coalesce lifo)
+
+function bits2list {
+	local -n arr=$1
+	local i
+	local list=()
+	for ((i=0; i<${#arr[@]}; ++i)) do
+		list[$i]=$(bit2option $1 $2 $i)
+	done
+	join , "${list[@]}"
+}
+
+function probe {
+	echo "=============================================== $(date)"
+	echo "${caption}: $*"
+	rm -f ${TESTDB_PREFIX}* \
+		&& ./mdbx_test --ignore-dbfull --repeat=42 --pathname=${TESTDB_PREFIX}db "$@" | lz4 > ${TESTDB_PREFIX}log.lz4 \
+		&& ./mdbx_chk -nvvv ${TESTDB_PREFIX}db | tee ${TESTDB_PREFIX}chk \
+		&& ([ ! -e ${TESTDB_PREFIX}db-copy ] || ./mdbx_chk -nvvv ${TESTDB_PREFIX}db-copy | tee ${TESTDB_PREFIX}chk-copy) \
+		|| (echo "FAILED"; exit 1)
+}
+
+###############################################################################
+
+count=0
+for nops in {7..2}; do
+	for ((wbatch=nops-1; wbatch > 0; --wbatch)); do
+		loops=$(((99 >> nops) / nops + 3))
+		for ((rep=0; rep++ < loops; )); do
+			for ((bits=2**${#options[@]}; --bits >= 0; )); do
+				seed=$(date +%N)
+				caption="Probe #$((++count)) int-key,w/o-dups, repeat ${rep} of ${loops}" probe \
+					--pagesize=min --size-upper=${db_size} --table=+key.integer,-data.dups --keylen.min=min --keylen.max=max --datalen.min=min --datalen.max=1111 \
+					--nops=$( rep9 $nops ) --batch.write=$( rep9 $wbatch ) --mode=$(bits2list options $bits) \
+					--keygen.seed=${seed} basic
+				caption="Probe #$((++count)) int-key,with-dups, repeat ${rep} of ${loops}" probe \
+					--pagesize=min --size-upper=${db_size} --table=+key.integer,+data.dups --keylen.min=min --keylen.max=max --datalen.min=min --datalen.max=max \
+					--nops=$( rep9 $nops ) --batch.write=$( rep9 $wbatch ) --mode=$(bits2list options $bits) \
+					--keygen.seed=${seed} basic
+				caption="Probe #$((++count)) int-key,int-data, repeat ${rep} of ${loops}" probe \
+					--pagesize=min --size-upper=${db_size} --table=+key.integer,+data.integer --keylen.min=min --keylen.max=max --datalen.min=min --datalen.max=max \
+					--nops=$( rep9 $nops ) --batch.write=$( rep9 $wbatch ) --mode=$(bits2list options $bits) \
+					--keygen.seed=${seed} basic
+				caption="Probe #$((++count)) w/o-dups, repeat ${rep} of ${loops}" probe \
+					--pagesize=min --size-upper=${db_size} --table=-data.dups --keylen.min=min --keylen.max=max --datalen.min=min --datalen.max=1111 \
+					--nops=$( rep9 $nops ) --batch.write=$( rep9 $wbatch ) --mode=$(bits2list options $bits) \
+					--keygen.seed=${seed} basic
+				caption="Probe #$((++count)) with-dups, repeat ${rep} of ${loops}" probe \
+					--pagesize=min --size-upper=${db_size} --table=+data.dups --keylen.min=min --keylen.max=max --datalen.min=min --datalen.max=max \
+					--nops=$( rep9 $nops ) --batch.write=$( rep9 $wbatch ) --mode=$(bits2list options $bits) \
+					--keygen.seed=${seed} basic
+			done
+		done
+	done
+done
+
+echo "=== ALL DONE ====================== $(date)"
diff --git a/test/loop.bat b/test/loop.bat
deleted file mode 100755
index a3bcd56f..00000000
--- a/test/loop.bat
+++ /dev/null
@@ -1,15 +0,0 @@
-@echo off
-
-del test.db test.db-lck
-
-:loop
-
-mdbx_test.exe --pathname=test.db --dont-cleanup-after basic > test.log
-if errorlevel 1 goto fail
-
-mdbx_chk.exe -nvvv test.db > chk.log
-if errorlevel 1 goto fail
-goto loop
-
-:fail
-echo FAILED