diff --git a/cmake/RPM.cmake b/cmake/RPM.cmake
index 21cd8fcc6..75b75e956 100644
--- a/cmake/RPM.cmake
+++ b/cmake/RPM.cmake
@@ -119,6 +119,12 @@ install(
     DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
   COMPONENT cdc
   )
+install(
+  DIRECTORY
+    ${PROJECT_SOURCE_DIR}/src/logservice/libobcdc/tests/scripts/
+    DESTINATION ${CMAKE_INSTALL_RUNSTATEDIR}
+  COMPONENT cdc
+  )
 
 if(OB_BUILD_OPENSOURCE)
 install(
diff --git a/src/logservice/cdcservice/ob_cdc_start_lsn_locator.cpp b/src/logservice/cdcservice/ob_cdc_start_lsn_locator.cpp
index c8b0f461a..2b0c87e26 100644
--- a/src/logservice/cdcservice/ob_cdc_start_lsn_locator.cpp
+++ b/src/logservice/cdcservice/ob_cdc_start_lsn_locator.cpp
@@ -136,7 +136,7 @@ int ObCdcStartLsnLocator::do_req_start_lsn_(const ObLocateLSNByTsReq &req,
       ret = OB_IN_STOP_STATE;
     }
 
-    EXTLOG_LOG(INFO, "locator req success", KR(ret), K(tenant_id_), K(req), K(resp), K(is_hurry_quit));
+    EXTLOG_LOG(INFO, "locator req done", KR(ret), K(tenant_id_), K(req), K(resp), K(is_hurry_quit));
   }
 
   return ret;
@@ -185,7 +185,7 @@ int ObCdcStartLsnLocator::do_locate_ls_(const bool fetch_archive_only,
     need_seek_archive = true;
   } else {
     if (OB_FAIL(init_palf_handle_guard_(ls_id, palf_handle_guard))) {
-      if (OB_LS_NOT_EXIST == ret) {
+      if (OB_LS_NOT_EXIST == ret && OB_SYS_TENANT_ID != tenant_id_) {
         ret = OB_SUCCESS;
         need_seek_archive = true;
       } else {
@@ -195,7 +195,7 @@ int ObCdcStartLsnLocator::do_locate_ls_(const bool fetch_archive_only,
     // - OB_ENTRY_NOT_EXIST: there is no log's log_ts is higher than ts_ns
     // - OB_ERR_OUT_OF_LOWER_BOUND: ts_ns is too old, log files may have been recycled
     } else if (OB_FAIL(palf_handle_guard.seek(start_scn, group_iter))) {
-      if (OB_ERR_OUT_OF_LOWER_BOUND == ret) {
+      if (OB_ERR_OUT_OF_LOWER_BOUND == ret && OB_SYS_TENANT_ID != tenant_id_) {
         ret = OB_SUCCESS;
         need_seek_archive = true;
       } else {
@@ -208,10 +208,6 @@ int ObCdcStartLsnLocator::do_locate_ls_(const bool fetch_archive_only,
     } else {
       result_ts_ns = log_group_entry.get_scn().get_val_for_logservice();
     }
-
-    if (OB_SYS_TENANT_ID == tenant_id_) {
-      need_seek_archive = false;
-    }
   // Note: us
   }
 
diff --git a/src/logservice/libobcdc/src/ob_cdc_auto_config_mgr.cpp b/src/logservice/libobcdc/src/ob_cdc_auto_config_mgr.cpp
index f3db57286..21a6fe6a2 100644
--- a/src/logservice/libobcdc/src/ob_cdc_auto_config_mgr.cpp
+++ b/src/logservice/libobcdc/src/ob_cdc_auto_config_mgr.cpp
@@ -92,7 +92,7 @@ void ObCDCAutoConfigMgr::init_queue_length_(const ObLogConfig &config)
 
   const int64_t msg_sorter_queue_length = br_queue_length;
   REFRESH_NUM_FIELD_WITH_CONFIG(msg_sorter_task_count_upper_limit, msg_sorter_queue_length, config.msg_sorter_task_count_upper_limit.get());
-  REFRESH_NUM_FIELD_WITH_CONFIG(sequencer_queue_length, MAX_QUEUE_LENGTH, config.sequencer_queue_length.get());
+  REFRESH_NUM_FIELD_WITH_CONFIG(sequencer_queue_length, MAX_QUEUE_LENGTH / 10, config.sequencer_queue_length.get());
   REFRESH_NUM_FIELD_WITH_CONFIG(storager_queue_length, DEFAULT_STORAGE_QUEUE_LENGTH, config.storager_queue_length.get());
   REFRESH_NUM_FIELD_WITH_CONFIG(reader_queue_length, DEFAULT_STORAGE_QUEUE_LENGTH, config.reader_queue_length.get());
 }
diff --git a/src/logservice/libobcdc/tests/scripts/kill_obcdc.sh b/src/logservice/libobcdc/tests/scripts/kill_obcdc.sh
new file mode 100755
index 000000000..c97186af9
--- /dev/null
+++ b/src/logservice/libobcdc/tests/scripts/kill_obcdc.sh
@@ -0,0 +1 @@
+cat run/libobcdc.pid | xargs kill -9
diff --git a/src/logservice/libobcdc/tests/scripts/libobcdc.conf b/src/logservice/libobcdc/tests/scripts/libobcdc.conf
new file mode 100644
index 000000000..449612f84
--- /dev/null
+++ b/src/logservice/libobcdc/tests/scripts/libobcdc.conf
@@ -0,0 +1,33 @@
+######### [cluster_info] #########
+cluster_db_name=oceanbase
+cluster_password=
+cluster_user=
+cluster_url=
+
+######### [working_mode] #########
+#working_mode=memory
+meta_data_refresh_mode=data_dict
+#meta_data_refresh_mode=online
+
+######### [synchronous information] #########
+tb_white_list=*.*.*
+#tb_white_list=sys.oblog*.*|oblog_tt.*.*
+tb_black_list=*.*.*_t|*.*.*_[0-9][a-z]
+
+
+######### [log] #########
+log_level=ALL.*:INFO;PALF.*:WARN;SHARE.SCHEMA:WARN;TLOG.FETCHER:INFO;TLOG.FORMATTER:INFO;
+#log_level=ALL.*:DEBUG;
+
+skip_dirty_data=0
+skip_ob_version_compat_check=1
+#enable_output_hidden_primary_key=1
+#print_participant_not_serve_info=1
+
+mysql_connect_timeout_sec=40
+mysql_query_timeout_sec=30
+
+######### [flow controll] #########
+memory_limit=8G
+pause_redo_dispatch_task_count_threshold=80
+memory_usage_warn_threshold=85
diff --git a/src/logservice/libobcdc/tests/scripts/start.sh b/src/logservice/libobcdc/tests/scripts/start.sh
new file mode 100755
index 000000000..78e958c17
--- /dev/null
+++ b/src/logservice/libobcdc/tests/scripts/start.sh
@@ -0,0 +1,33 @@
+#!/bin/bash
+
+TIMESTAMP=`date -d "2023-6-16 19:30:31" +%s`
+TIMESTAMP=0
+
+CONFIG=conf/libobcdc.conf
+DATA_FILE=data/data.log
+
+RUN_TIME=60
+
+LOG_DIR=./log
+
+./kill_obcdc.sh
+
+rm -fr $LOG_DIR/ core.* ${DATA_FILE}*
+
+export LD_LIBRARY_PATH=./lib/:$LD_LIBRARY_PATH
+./obcdc_tailf -v
+ulimit -c unlimited
+## work in background
+`pwd`/obcdc_tailf -f $CONFIG -t $TIMESTAMP -d
+#`pwd`/obcdc_tailf -f $CONFIG -T $TIMESTAMP -d
+#./obcdc_tailf_static -f $CONFIG -T $TIMESTAMP -d
+#`pwd`/obcdc_tailf -f $CONFIG -T $TIMESTAMP -D${DATA_FILE} -d
+
+# Timed runs in the background
+# `pwd`/obcdc_tailf -R $RUN_TIME -f $CONFIG -t $TIMESTAMP -d
+
+# output data
+# `pwd`/obcdc_tailf -V -f $CONFIG -T $TIMESTAMP -D${DATA_FILE} 2>&1 | grep -v tid
+
+# Timed runs with output data
+# `pwd`/obcdc_tailf -x -o -R$RUN_TIME -f $CONFIG -t $TIMESTAMP -D${DATA_FILE} 2>&1 | grep -v tid
diff --git a/src/logservice/libobcdc/tests/scripts/top.sh b/src/logservice/libobcdc/tests/scripts/top.sh
new file mode 100755
index 000000000..8a36bb3a8
--- /dev/null
+++ b/src/logservice/libobcdc/tests/scripts/top.sh
@@ -0,0 +1,3 @@
+PID=`cat run/libobcdc.pid`
+
+top -d 1 -p $PID
diff --git a/src/logservice/libobcdc/tests/scripts/watch_delay.sh b/src/logservice/libobcdc/tests/scripts/watch_delay.sh
new file mode 100755
index 000000000..458078fd6
--- /dev/null
+++ b/src/logservice/libobcdc/tests/scripts/watch_delay.sh
@@ -0,0 +1,4 @@
+
+LOG_FILE=log/libobcdc.log
+
+watch -n 1 "if [ -f $LOG_FILE ]; then grep MIN_DELAY $LOG_FILE | grep HEARTBEAT | awk '{print \$11, \$12, \$13}' | tail -n 3; fi"
diff --git a/src/logservice/libobcdc/tests/scripts/watch_tps.sh b/src/logservice/libobcdc/tests/scripts/watch_tps.sh
new file mode 100755
index 000000000..226393ae7
--- /dev/null
+++ b/src/logservice/libobcdc/tests/scripts/watch_tps.sh
@@ -0,0 +1,4 @@
+
+LOG_FILE=log/libobcdc.log
+
+watch -n 1 "if [ -f $LOG_FILE ]; then grep NEXT_RECORD_TPS $LOG_FILE | awk '{print \$1, \$2, \$10, \$11, \$12, \$13}' | tail -n 3; fi"
diff --git a/src/logservice/libobcdc/tests/scripts/watch_traffic.sh b/src/logservice/libobcdc/tests/scripts/watch_traffic.sh
new file mode 100755
index 000000000..7c9abf504
--- /dev/null
+++ b/src/logservice/libobcdc/tests/scripts/watch_traffic.sh
@@ -0,0 +1,3 @@
+LOG=log/libobcdc.log
+
+watch -n 1 "if [ -f $LOG ]; then grep traffic $LOG  | grep -v traffic=0.00B | awk '{printf(\"%-26s %-13s %-10s %-10s %-14s %-12s %-18s %-28s %-25s %-26s\n\", \$10, \$11, \$12, \$13, \$14, \$15, \$17, \$18, \$19, \$20);}' | tail -n 3; fi"