diff --git a/src/bin/gs_guc/pg_guc.cpp b/src/bin/gs_guc/pg_guc.cpp
index 4bc1a2bb..3eba29f2 100644
--- a/src/bin/gs_guc/pg_guc.cpp
+++ b/src/bin/gs_guc/pg_guc.cpp
@@ -172,7 +172,7 @@ const int EQUAL_MARK_LEN = 3;
 #define ADDPOINTER_SIZE 2
 #define MAX_HOST_NAME_LENGTH 255
 
-#define TEMP_PGCONF_FILE "postgresql.conf.bak"
+#define TEMP_PGCONF_FILE "postgresql.conf.guc.bak"
 #define TEMP_CMAGENTCONF_FILE "cm_agent.conf.bak"
 #define TEMP_CMSERVERCONF_FILE "cm_server.conf.bak"
 #define TEMP_GTMCONF_FILE "gtm.conf.bak"
diff --git a/src/common/backend/utils/misc/guc.cpp b/src/common/backend/utils/misc/guc.cpp
index 483be1d5..129aeeaf 100644
--- a/src/common/backend/utils/misc/guc.cpp
+++ b/src/common/backend/utils/misc/guc.cpp
@@ -4037,7 +4037,7 @@ static void InitConfigureNamesInt()
              gettext_noop("Sets the maximum threshold for cleaning cache."),
              NULL,
              GUC_UNIT_KB},
-            &g_instance.attr.attr_memory.local_syscache_threshold,
+            &u_sess->attr.attr_memory.local_syscache_threshold,
             256 * 1024,
             1 * 1024,
             512 * 1024,
@@ -16158,11 +16158,11 @@ static bool check_gpc_syscache_threshold(bool* newval, void** extra, GucSource s
     if (*newval) {
         /* in case local_syscache_threshold is too low cause gpc does not take effect, we set local_syscache_threshold
            at least 16MB if gpc is on. */
-        if (g_instance.attr.attr_memory.local_syscache_threshold < 16 * 1024) {
+        if (u_sess->attr.attr_memory.local_syscache_threshold < 16 * 1024) {
             ereport(WARNING, (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                           errmsg("set local_syscache_threshold from %dMB to 16MB in case gpc is on but not valid.",
-                                 g_instance.attr.attr_memory.local_syscache_threshold / 1024)));
-            g_instance.attr.attr_memory.local_syscache_threshold = 16 * 1024;
+                                 u_sess->attr.attr_memory.local_syscache_threshold / 1024)));
+            u_sess->attr.attr_memory.local_syscache_threshold = 16 * 1024;
         }
     }
     return true;
@@ -16176,7 +16176,7 @@ static bool check_syscache_threshold_gpc(int* newval, void** extra, GucSource so
         ereport(WARNING, (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                       errmsg("cannot set local_syscache_threshold to %dMB in case gpc is on but not valid."
                              "Set local_syscache_threshold to 16MB default.", *newval / 1024)));
-        g_instance.attr.attr_memory.local_syscache_threshold = 16 * 1024;
+        u_sess->attr.attr_memory.local_syscache_threshold = 16 * 1024;
     }
 
     return true;
diff --git a/src/gausskernel/process/postmaster/postmaster.cpp b/src/gausskernel/process/postmaster/postmaster.cpp
index ea2c611f..b7419c48 100755
--- a/src/gausskernel/process/postmaster/postmaster.cpp
+++ b/src/gausskernel/process/postmaster/postmaster.cpp
@@ -9563,12 +9563,12 @@ void CleanSystemCaches(bool is_in_read_command)
     usedSize = ((AllocSet)u_sess->cache_mem_cxt)->totalSpace - ((AllocSet)u_sess->cache_mem_cxt)->freeSpace;
 
     /* Over threshold, need to clean cache. */
-    if (usedSize > g_instance.attr.attr_memory.local_syscache_threshold*1024) {
+    if (usedSize > u_sess->attr.attr_memory.local_syscache_threshold*1024) {
         ereport(DEBUG1,
             (errmsg("CleanSystemCaches due to "
                     "SystemCache(%ld) greater than (%d),in_read_command(%d).",
                 usedSize,
-                 g_instance.attr.attr_memory.local_syscache_threshold*1024,
+                 u_sess->attr.attr_memory.local_syscache_threshold*1024,
                 (is_in_read_command ? 1 : 0))));
 
         if (IsTransactionOrTransactionBlock() || !is_in_read_command) {
diff --git a/src/gausskernel/storage/replication/walreceiver.cpp b/src/gausskernel/storage/replication/walreceiver.cpp
index 2af32113..5efb9d1c 100644
--- a/src/gausskernel/storage/replication/walreceiver.cpp
+++ b/src/gausskernel/storage/replication/walreceiver.cpp
@@ -81,7 +81,7 @@ bool wal_catchup = false;
 
 #define NAPTIME_PER_CYCLE 1 /* max sleep time between cycles (1ms) */
 
-#define CONFIG_BAK_FILENAME "postgresql.conf.bak"
+#define CONFIG_BAK_FILENAME_WAL "postgresql.conf.wal"
 
 #define WAL_DATA_LEN ((sizeof(uint32) + 1 + sizeof(XLogRecPtr)))
 
@@ -2550,7 +2550,7 @@ static bool ProcessConfigFileMessage(char *buf, Size len)
     int ret = 0;
     char **reserve_item = NULL;
 
-    ret = snprintf_s(conf_bak, MAXPGPATH, MAXPGPATH - 1, "%s/%s", t_thrd.proc_cxt.DataDir, CONFIG_BAK_FILENAME);
+    ret = snprintf_s(conf_bak, MAXPGPATH, MAXPGPATH - 1, "%s/%s", t_thrd.proc_cxt.DataDir, CONFIG_BAK_FILENAME_WAL);
     securec_check_ss(ret, "\0", "\0");
 
     if (lstat(t_thrd.walreceiver_cxt.gucconf_file, &statbuf) != 0) {
diff --git a/src/include/knl/knl_guc/knl_instance_attr_memory.h b/src/include/knl/knl_guc/knl_instance_attr_memory.h
index d262925f..e0398b82 100644
--- a/src/include/knl/knl_guc/knl_instance_attr_memory.h
+++ b/src/include/knl/knl_guc/knl_instance_attr_memory.h
@@ -45,7 +45,6 @@ typedef struct knl_instance_attr_memory {
     bool enable_memory_limit;
     int memorypool_size;
     int max_process_memory;
-    int local_syscache_threshold;
 } knl_instance_attr_memory;
 
 #endif /* SRC_INCLUDE_KNL_KNL_INSTANCE_ATTR_MEMORY_H_ */
diff --git a/src/include/knl/knl_guc/knl_session_attr_memory.h b/src/include/knl/knl_guc/knl_session_attr_memory.h
index 59984eba..a712483d 100644
--- a/src/include/knl/knl_guc/knl_session_attr_memory.h
+++ b/src/include/knl/knl_guc/knl_session_attr_memory.h
@@ -51,6 +51,7 @@ typedef struct knl_session_attr_memory {
     char* uncontrolled_memory_context;
     int memory_tracking_mode;
     int min_dynamic_memory;
+    int local_syscache_threshold;
 } knl_session_attr_memory;
 
 #endif /* SRC_INCLUDE_KNL_KNL_SESSION_ATTR_MEMORY_H_ */