* However, we define it here so that the format is documented.
*
*
- * Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $PostgreSQL: pgsql/src/include/catalog/pg_control.h,v 1.35 2007/01/05 22:19:52 momjian Exp $
+ * src/include/catalog/pg_control.h
*
*-------------------------------------------------------------------------
*/
#ifndef PG_CONTROL_H
#define PG_CONTROL_H
-#include <time.h>
-
#include "access/xlogdefs.h"
-#include "utils/pg_crc.h"
+#include "pgtime.h" /* for pg_time_t */
+#include "port/pg_crc32c.h"
+
+#define MOCK_AUTH_NONCE_LEN 32
/* Version identifier for this pg_control format */
-#define PG_CONTROL_VERSION 831
+#define PG_CONTROL_VERSION 1002
/*
* Body of CheckPoint XLOG records. This is declared here because we keep
* a copy of the latest one in pg_control for possible disaster recovery.
+ * Changing this struct requires a PG_CONTROL_VERSION bump.
*/
typedef struct CheckPoint
{
XLogRecPtr redo; /* next RecPtr available when we began to
* create CheckPoint (i.e. REDO start point) */
- XLogRecPtr undo; /* first record of oldest in-progress
- * transaction when we started (i.e. UNDO end
- * point) */
TimeLineID ThisTimeLineID; /* current TLI */
+ TimeLineID PrevTimeLineID; /* previous TLI, if this record begins a new
+ * timeline (equals ThisTimeLineID otherwise) */
+ bool fullPageWrites; /* current full_page_writes */
uint32 nextXidEpoch; /* higher-order bits of nextXid */
TransactionId nextXid; /* next free XID */
Oid nextOid; /* next free OID */
MultiXactId nextMulti; /* next free MultiXactId */
MultiXactOffset nextMultiOffset; /* next free MultiXact offset */
- time_t time; /* time stamp of checkpoint */
+ TransactionId oldestXid; /* cluster-wide minimum datfrozenxid */
+ Oid oldestXidDB; /* database with minimum datfrozenxid */
+ MultiXactId oldestMulti; /* cluster-wide minimum datminmxid */
+ Oid oldestMultiDB; /* database with minimum datminmxid */
+ pg_time_t time; /* time stamp of checkpoint */
+ TransactionId oldestCommitTsXid; /* oldest Xid with valid commit
+ * timestamp */
+ TransactionId newestCommitTsXid; /* newest Xid with valid commit
+ * timestamp */
+
+ /*
+ * Oldest XID still running. This is only needed to initialize hot standby
+ * mode from an online checkpoint, so we only bother calculating this for
+ * online checkpoints and only when wal_level is replica. Otherwise it's
+ * set to InvalidTransactionId.
+ */
+ TransactionId oldestActiveXid;
} CheckPoint;
/* XLOG info values for XLOG rmgr */
#define XLOG_CHECKPOINT_SHUTDOWN 0x00
#define XLOG_CHECKPOINT_ONLINE 0x10
+#define XLOG_NOOP 0x20
#define XLOG_NEXTOID 0x30
#define XLOG_SWITCH 0x40
+#define XLOG_BACKUP_END 0x50
+#define XLOG_PARAMETER_CHANGE 0x60
+#define XLOG_RESTORE_POINT 0x70
+#define XLOG_FPW_CHANGE 0x80
+#define XLOG_END_OF_RECOVERY 0x90
+#define XLOG_FPI_FOR_HINT 0xA0
+#define XLOG_FPI 0xB0
-/* System status indicator */
+/*
+ * System status indicator. Note this is stored in pg_control; if you change
+ * it, you must bump PG_CONTROL_VERSION
+ */
typedef enum DBState
{
DB_STARTUP = 0,
DB_SHUTDOWNED,
+ DB_SHUTDOWNED_IN_RECOVERY,
DB_SHUTDOWNING,
DB_IN_CRASH_RECOVERY,
DB_IN_ARCHIVE_RECOVERY,
DB_IN_PRODUCTION
} DBState;
-#define LOCALE_NAME_BUFLEN 128
-
/*
* Contents of pg_control.
*
* NOTE: try to keep this under 512 bytes so that it will fit on one physical
* sector of typical disk drives. This reduces the odds of corruption due to
- * power failure midway through a write. Currently it fits comfortably,
- * but we could probably reduce LOCALE_NAME_BUFLEN if things get tight.
+ * power failure midway through a write.
*/
typedef struct ControlFileData
uint64 system_identifier;
/*
- * Version identifier information. Keep these fields at the same offset,
+ * Version identifier information. Keep these fields at the same offset,
* especially pg_control_version; they won't be real useful if they move
- * around. (For historical reasons they must be 8 bytes into the file
+ * around. (For historical reasons they must be 8 bytes into the file
* rather than immediately at the front.)
*
* pg_control_version identifies the format of pg_control itself.
* example, WAL logs contain per-page magic numbers that can serve as
* version cues for the WAL log.
*/
- uint32 pg_control_version; /* PG_CONTROL_VERSION */
- uint32 catalog_version_no; /* see catversion.h */
+ uint32 pg_control_version; /* PG_CONTROL_VERSION */
+ uint32 catalog_version_no; /* see catversion.h */
/*
* System status data
*/
DBState state; /* see enum above */
- time_t time; /* time stamp of last pg_control update */
+ pg_time_t time; /* time stamp of last pg_control update */
XLogRecPtr checkPoint; /* last check point record ptr */
XLogRecPtr prevCheckPoint; /* previous check point record ptr */
CheckPoint checkPointCopy; /* copy of last check point record */
- XLogRecPtr minRecoveryPoint; /* must replay xlog to here */
+ XLogRecPtr unloggedLSN; /* current fake LSN value, for unlogged rels */
+
+ /*
+ * These two values determine the minimum point we must recover up to
+ * before starting up:
+ *
+ * minRecoveryPoint is updated to the latest replayed LSN whenever we
+ * flush a data change during archive recovery. That guards against
+ * starting archive recovery, aborting it, and restarting with an earlier
+ * stop location. If we've already flushed data changes from WAL record X
+ * to disk, we mustn't start up until we reach X again. Zero when not
+ * doing archive recovery.
+ *
+ * backupStartPoint is the redo pointer of the backup start checkpoint, if
+ * we are recovering from an online backup and haven't reached the end of
+ * backup yet. It is reset to zero when the end of backup is reached, and
+ * we mustn't start up before that. A boolean would suffice otherwise, but
+ * we use the redo pointer as a cross-check when we see an end-of-backup
+ * record, to make sure the end-of-backup record corresponds the base
+ * backup we're recovering from.
+ *
+ * backupEndPoint is the backup end location, if we are recovering from an
+ * online backup which was taken from the standby and haven't reached the
+ * end of backup yet. It is initialized to the minimum recovery point in
+ * pg_control which was backed up last. It is reset to zero when the end
+ * of backup is reached, and we mustn't start up before that.
+ *
+ * If backupEndRequired is true, we know for sure that we're restoring
+ * from a backup, and must see a backup-end record before we can safely
+ * start up. If it's false, but backupStartPoint is set, a backup_label
+ * file was found at startup but it may have been a leftover from a stray
+ * pg_start_backup() call, not accompanied by pg_stop_backup().
+ */
+ XLogRecPtr minRecoveryPoint;
+ TimeLineID minRecoveryPointTLI;
+ XLogRecPtr backupStartPoint;
+ XLogRecPtr backupEndPoint;
+ bool backupEndRequired;
+
+ /*
+ * Parameter settings that determine if the WAL can be used for archival
+ * or hot standby.
+ */
+ int wal_level;
+ bool wal_log_hints;
+ int MaxConnections;
+ int max_worker_processes;
+ int max_prepared_xacts;
+ int max_locks_per_xact;
+ bool track_commit_timestamp;
/*
* This data is used to check for hardware-architecture compatibility of
uint32 nameDataLen; /* catalog name field width */
uint32 indexMaxKeys; /* max number of columns in an index */
- /* flag indicating internal format of timestamp, interval, time */
- uint32 enableIntTimes; /* int64 storage enabled? */
+ uint32 toast_max_chunk_size; /* chunk size in TOAST tables */
+ uint32 loblksize; /* chunk size in pg_largeobject */
+
+ /* flags indicating pass-by-value status of various types */
+ bool float4ByVal; /* float4 pass-by-value? */
+ bool float8ByVal; /* float8, int8, etc pass-by-value? */
+
+ /* Are data pages protected by checksums? Zero if no checksum version */
+ uint32 data_checksum_version;
- /* active locales */
- uint32 localeBuflen;
- char lc_collate[LOCALE_NAME_BUFLEN];
- char lc_ctype[LOCALE_NAME_BUFLEN];
+ /*
+ * Random nonce, used in authentication requests that need to proceed
+ * based on values that are cluster-unique, like a SASL exchange that
+ * failed at an early stage.
+ */
+ char mock_authentication_nonce[MOCK_AUTH_NONCE_LEN];
/* CRC of all above ... MUST BE LAST! */
- pg_crc32 crc;
+ pg_crc32c crc;
} ControlFileData;
/*
*/
#define PG_CONTROL_SIZE 8192
-#endif /* PG_CONTROL_H */
+#endif /* PG_CONTROL_H */