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diff --git a/src/backend/utils/init/globals.c b/src/backend/utils/init/globals.c
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+/*-------------------------------------------------------------------------
+ *
+ * globals.c
+ *	  global variable declarations
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ *	  src/backend/utils/init/globals.c
+ *
+ * NOTES
+ *	  Globals used all over the place should be declared here and not
+ *	  in other modules.
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include "common/file_perm.h"
+#include "libpq/libpq-be.h"
+#include "libpq/pqcomm.h"
+#include "miscadmin.h"
+#include "storage/backendid.h"
+
+
+ProtocolVersion FrontendProtocol;
+
+volatile sig_atomic_t InterruptPending = false;
+volatile sig_atomic_t QueryCancelPending = false;
+volatile sig_atomic_t ProcDiePending = false;
+volatile sig_atomic_t CheckClientConnectionPending = false;
+volatile sig_atomic_t ClientConnectionLost = false;
+volatile sig_atomic_t IdleInTransactionSessionTimeoutPending = false;
+volatile sig_atomic_t IdleSessionTimeoutPending = false;
+volatile sig_atomic_t ProcSignalBarrierPending = false;
+volatile sig_atomic_t LogMemoryContextPending = false;
+volatile uint32 InterruptHoldoffCount = 0;
+volatile uint32 QueryCancelHoldoffCount = 0;
+volatile uint32 CritSectionCount = 0;
+
+int			MyProcPid;
+pg_time_t	MyStartTime;
+TimestampTz MyStartTimestamp;
+struct Port *MyProcPort;
+int32		MyCancelKey;
+int			MyPMChildSlot;
+
+/*
+ * MyLatch points to the latch that should be used for signal handling by the
+ * current process. It will either point to a process local latch if the
+ * current process does not have a PGPROC entry in that moment, or to
+ * PGPROC->procLatch if it has. Thus it can always be used in signal handlers,
+ * without checking for its existence.
+ */
+struct Latch *MyLatch;
+
+/*
+ * DataDir is the absolute path to the top level of the PGDATA directory tree.
+ * Except during early startup, this is also the server's working directory;
+ * most code therefore can simply use relative paths and not reference DataDir
+ * explicitly.
+ */
+char	   *DataDir = NULL;
+
+/*
+ * Mode of the data directory.  The default is 0700 but it may be changed in
+ * checkDataDir() to 0750 if the data directory actually has that mode.
+ */
+int			data_directory_mode = PG_DIR_MODE_OWNER;
+
+char		OutputFileName[MAXPGPATH];	/* debugging output file */
+
+char		my_exec_path[MAXPGPATH];	/* full path to my executable */
+char		pkglib_path[MAXPGPATH]; /* full path to lib directory */
+
+#ifdef EXEC_BACKEND
+char		postgres_exec_path[MAXPGPATH];	/* full path to backend */
+
+/* note: currently this is not valid in backend processes */
+#endif
+
+BackendId	MyBackendId = InvalidBackendId;
+
+BackendId	ParallelLeaderBackendId = InvalidBackendId;
+
+Oid			MyDatabaseId = InvalidOid;
+
+Oid			MyDatabaseTableSpace = InvalidOid;
+
+/*
+ * DatabasePath is the path (relative to DataDir) of my database's
+ * primary directory, ie, its directory in the default tablespace.
+ */
+char	   *DatabasePath = NULL;
+
+pid_t		PostmasterPid = 0;
+
+/*
+ * IsPostmasterEnvironment is true in a postmaster process and any postmaster
+ * child process; it is false in a standalone process (bootstrap or
+ * standalone backend).  IsUnderPostmaster is true in postmaster child
+ * processes.  Note that "child process" includes all children, not only
+ * regular backends.  These should be set correctly as early as possible
+ * in the execution of a process, so that error handling will do the right
+ * things if an error should occur during process initialization.
+ *
+ * These are initialized for the bootstrap/standalone case.
+ */
+bool		IsPostmasterEnvironment = false;
+bool		IsUnderPostmaster = false;
+bool		IsBinaryUpgrade = false;
+bool		IsBackgroundWorker = false;
+
+bool		ExitOnAnyError = false;
+
+int			DateStyle = USE_ISO_DATES;
+int			DateOrder = DATEORDER_MDY;
+int			IntervalStyle = INTSTYLE_POSTGRES;
+
+bool		enableFsync = true;
+bool		allowSystemTableMods = false;
+int			work_mem = 4096;
+double		hash_mem_multiplier = 1.0;
+int			maintenance_work_mem = 65536;
+int			max_parallel_maintenance_workers = 2;
+
+/*
+ * Primary determinants of sizes of shared-memory structures.
+ *
+ * MaxBackends is computed by PostmasterMain after modules have had a chance to
+ * register background workers.
+ */
+int			NBuffers = 1000;
+int			MaxConnections = 90;
+int			max_worker_processes = 8;
+int			max_parallel_workers = 8;
+int			MaxBackends = 0;
+
+int			VacuumCostPageHit = 1;	/* GUC parameters for vacuum */
+int			VacuumCostPageMiss = 2;
+int			VacuumCostPageDirty = 20;
+int			VacuumCostLimit = 200;
+double		VacuumCostDelay = 0;
+
+int64		VacuumPageHit = 0;
+int64		VacuumPageMiss = 0;
+int64		VacuumPageDirty = 0;
+
+int			VacuumCostBalance = 0;	/* working state for vacuum */
+bool		VacuumCostActive = false;