PostgreSQL Source Code  git master
heapam.h
Go to the documentation of this file.
1 /*-------------------------------------------------------------------------
2  *
3  * heapam.h
4  * POSTGRES heap access method definitions.
5  *
6  *
7  * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
8  * Portions Copyright (c) 1994, Regents of the University of California
9  *
10  * src/include/access/heapam.h
11  *
12  *-------------------------------------------------------------------------
13  */
14 #ifndef HEAPAM_H
15 #define HEAPAM_H
16 
17 #include "access/relation.h" /* for backward compatibility */
18 #include "access/relscan.h"
19 #include "access/sdir.h"
20 #include "access/skey.h"
21 #include "access/table.h" /* for backward compatibility */
22 #include "access/tableam.h"
23 #include "nodes/lockoptions.h"
24 #include "nodes/primnodes.h"
25 #include "storage/bufpage.h"
26 #include "storage/dsm.h"
27 #include "storage/lockdefs.h"
28 #include "storage/shm_toc.h"
29 #include "utils/relcache.h"
30 #include "utils/snapshot.h"
31 
32 
33 /* "options" flag bits for heap_insert */
34 #define HEAP_INSERT_SKIP_FSM TABLE_INSERT_SKIP_FSM
35 #define HEAP_INSERT_FROZEN TABLE_INSERT_FROZEN
36 #define HEAP_INSERT_NO_LOGICAL TABLE_INSERT_NO_LOGICAL
37 #define HEAP_INSERT_SPECULATIVE 0x0010
38 
40 struct TupleTableSlot;
41 
42 #define MaxLockTupleMode LockTupleExclusive
43 
44 /*
45  * Descriptor for heap table scans.
46  */
47 typedef struct HeapScanDescData
48 {
49  TableScanDescData rs_base; /* AM independent part of the descriptor */
50 
51  /* state set up at initscan time */
52  BlockNumber rs_nblocks; /* total number of blocks in rel */
53  BlockNumber rs_startblock; /* block # to start at */
54  BlockNumber rs_numblocks; /* max number of blocks to scan */
55  /* rs_numblocks is usually InvalidBlockNumber, meaning "scan whole rel" */
56 
57  /* scan current state */
58  bool rs_inited; /* false = scan not init'd yet */
59  BlockNumber rs_cblock; /* current block # in scan, if any */
60  Buffer rs_cbuf; /* current buffer in scan, if any */
61  /* NB: if rs_cbuf is not InvalidBuffer, we hold a pin on that buffer */
62 
63  /* rs_numblocks is usually InvalidBlockNumber, meaning "scan whole rel" */
64  BufferAccessStrategy rs_strategy; /* access strategy for reads */
65 
66  HeapTupleData rs_ctup; /* current tuple in scan, if any */
67 
68  /* these fields only used in page-at-a-time mode and for bitmap scans */
69  int rs_cindex; /* current tuple's index in vistuples */
70  int rs_ntuples; /* number of visible tuples on page */
74 
75 /*
76  * Descriptor for fetches from heap via an index.
77  */
78 typedef struct IndexFetchHeapData
79 {
80  IndexFetchTableData xs_base; /* AM independent part of the descriptor */
81 
82  Buffer xs_cbuf; /* current heap buffer in scan, if any */
83  /* NB: if xs_cbuf is not InvalidBuffer, we hold a pin on that buffer */
85 
86 /* Result codes for HeapTupleSatisfiesVacuum */
87 typedef enum
88 {
89  HEAPTUPLE_DEAD, /* tuple is dead and deletable */
90  HEAPTUPLE_LIVE, /* tuple is live (committed, no deleter) */
91  HEAPTUPLE_RECENTLY_DEAD, /* tuple is dead, but not deletable yet */
92  HEAPTUPLE_INSERT_IN_PROGRESS, /* inserting xact is still in progress */
93  HEAPTUPLE_DELETE_IN_PROGRESS /* deleting xact is still in progress */
94 } HTSV_Result;
95 
96 /* ----------------
97  * function prototypes for heap access method
98  *
99  * heap_create, heap_create_with_catalog, and heap_drop_with_catalog
100  * are declared in catalog/heap.h
101  * ----------------
102  */
103 
104 
105 /*
106  * HeapScanIsValid
107  * True iff the heap scan is valid.
108  */
109 #define HeapScanIsValid(scan) PointerIsValid(scan)
110 
111 extern TableScanDesc heap_beginscan(Relation relation, Snapshot snapshot,
112  int nkeys, ScanKey key,
113  ParallelTableScanDesc parallel_scan,
114  uint32 flags);
115 extern void heap_setscanlimits(TableScanDesc scan, BlockNumber startBlk,
116  BlockNumber numBlks);
117 extern void heapgetpage(TableScanDesc scan, BlockNumber page);
118 extern void heap_rescan(TableScanDesc scan, ScanKey key, bool set_params,
119  bool allow_strat, bool allow_sync, bool allow_pagemode);
120 extern void heap_endscan(TableScanDesc scan);
121 extern HeapTuple heap_getnext(TableScanDesc scan, ScanDirection direction);
122 extern bool heap_getnextslot(TableScanDesc sscan,
123  ScanDirection direction, struct TupleTableSlot *slot);
124 
125 extern bool heap_fetch(Relation relation, Snapshot snapshot,
126  HeapTuple tuple, Buffer *userbuf);
127 extern bool heap_hot_search_buffer(ItemPointer tid, Relation relation,
128  Buffer buffer, Snapshot snapshot, HeapTuple heapTuple,
129  bool *all_dead, bool first_call);
130 
131 extern void heap_get_latest_tid(TableScanDesc scan, ItemPointer tid);
132 extern void setLastTid(const ItemPointer tid);
133 
134 extern BulkInsertState GetBulkInsertState(void);
135 extern void FreeBulkInsertState(BulkInsertState);
136 extern void ReleaseBulkInsertStatePin(BulkInsertState bistate);
137 
138 extern void heap_insert(Relation relation, HeapTuple tup, CommandId cid,
139  int options, BulkInsertState bistate);
140 extern void heap_multi_insert(Relation relation, struct TupleTableSlot **slots,
141  int ntuples, CommandId cid, int options,
142  BulkInsertState bistate);
143 extern TM_Result heap_delete(Relation relation, ItemPointer tid,
144  CommandId cid, Snapshot crosscheck, bool wait,
145  struct TM_FailureData *tmfd, bool changingPart);
146 extern void heap_finish_speculative(Relation relation, ItemPointer tid);
147 extern void heap_abort_speculative(Relation relation, ItemPointer tid);
148 extern TM_Result heap_update(Relation relation, ItemPointer otid,
149  HeapTuple newtup,
150  CommandId cid, Snapshot crosscheck, bool wait,
151  struct TM_FailureData *tmfd, LockTupleMode *lockmode);
152 extern TM_Result heap_lock_tuple(Relation relation, HeapTuple tuple,
153  CommandId cid, LockTupleMode mode, LockWaitPolicy wait_policy,
154  bool follow_update,
155  Buffer *buffer, struct TM_FailureData *tmfd);
156 
157 extern void heap_inplace_update(Relation relation, HeapTuple tuple);
158 extern bool heap_freeze_tuple(HeapTupleHeader tuple,
159  TransactionId relfrozenxid, TransactionId relminmxid,
160  TransactionId cutoff_xid, TransactionId cutoff_multi);
161 extern bool heap_tuple_needs_freeze(HeapTupleHeader tuple, TransactionId cutoff_xid,
162  MultiXactId cutoff_multi, Buffer buf);
164 
165 extern void simple_heap_insert(Relation relation, HeapTuple tup);
166 extern void simple_heap_delete(Relation relation, ItemPointer tid);
167 extern void simple_heap_update(Relation relation, ItemPointer otid,
168  HeapTuple tup);
169 
171  ItemPointerData *items,
172  int nitems);
173 
174 /* in heap/pruneheap.c */
175 extern void heap_page_prune_opt(Relation relation, Buffer buffer);
176 extern int heap_page_prune(Relation relation, Buffer buffer,
178  bool report_stats, TransactionId *latestRemovedXid);
179 extern void heap_page_prune_execute(Buffer buffer,
180  OffsetNumber *redirected, int nredirected,
181  OffsetNumber *nowdead, int ndead,
182  OffsetNumber *nowunused, int nunused);
183 extern void heap_get_root_tuples(Page page, OffsetNumber *root_offsets);
184 
185 /* in heap/syncscan.c */
186 extern void ss_report_location(Relation rel, BlockNumber location);
187 extern BlockNumber ss_get_location(Relation rel, BlockNumber relnblocks);
188 extern void SyncScanShmemInit(void);
189 extern Size SyncScanShmemSize(void);
190 
191 /* in heap/vacuumlazy.c */
192 struct VacuumParams;
193 extern void heap_vacuum_rel(Relation onerel,
194  struct VacuumParams *params, BufferAccessStrategy bstrategy);
195 extern void parallel_vacuum_main(dsm_segment *seg, shm_toc *toc);
196 
197 /* in heap/heapam_visibility.c */
198 extern bool HeapTupleSatisfiesVisibility(HeapTuple stup, Snapshot snapshot,
199  Buffer buffer);
201  Buffer buffer);
203  Buffer buffer);
204 extern void HeapTupleSetHintBits(HeapTupleHeader tuple, Buffer buffer,
205  uint16 infomask, TransactionId xid);
207 extern bool XidInMVCCSnapshot(TransactionId xid, Snapshot snapshot);
209 
210 /*
211  * To avoid leaking too much knowledge about reorderbuffer implementation
212  * details this is implemented in reorderbuffer.c not heapam_visibility.c
213  */
214 struct HTAB;
216  Snapshot snapshot,
217  HeapTuple htup,
218  Buffer buffer,
219  CommandId *cmin, CommandId *cmax);
220 extern void HeapCheckForSerializableConflictOut(bool valid, Relation relation, HeapTuple tuple,
221  Buffer buffer, Snapshot snapshot);
222 
223 #endif /* HEAPAM_H */
uint32 CommandId
Definition: c.h:527
bool heap_fetch(Relation relation, Snapshot snapshot, HeapTuple tuple, Buffer *userbuf)
Definition: heapam.c:1373
static PgChecksumMode mode
Definition: pg_checksums.c:61
BlockNumber rs_cblock
Definition: heapam.h:59
LockTupleMode
Definition: lockoptions.h:49
void SyncScanShmemInit(void)
Definition: syncscan.c:135
uint32 TransactionId
Definition: c.h:513
bool HeapTupleHeaderIsOnlyLocked(HeapTupleHeader tuple)
TableScanDescData rs_base
Definition: heapam.h:49
void ReleaseBulkInsertStatePin(BulkInsertState bistate)
Definition: heapam.c:1804
#define MaxHeapTuplesPerPage
Definition: htup_details.h:574
bool heap_tuple_needs_eventual_freeze(HeapTupleHeader tuple)
Definition: heapam.c:6742
void heapgetpage(TableScanDesc scan, BlockNumber page)
Definition: heapam.c:352
uint32 BlockNumber
Definition: block.h:31
void HeapTupleSetHintBits(HeapTupleHeader tuple, Buffer buffer, uint16 infomask, TransactionId xid)
void parallel_vacuum_main(dsm_segment *seg, shm_toc *toc)
Definition: vacuumlazy.c:3467
struct HeapScanDescData * HeapScanDesc
Definition: heapam.h:73
HeapTupleData rs_ctup
Definition: heapam.h:66
void heap_get_root_tuples(Page page, OffsetNumber *root_offsets)
Definition: pruneheap.c:745
uint16 OffsetNumber
Definition: off.h:24
bool HeapTupleIsSurelyDead(HeapTuple htup, TransactionId OldestXmin)
void heap_multi_insert(Relation relation, struct TupleTableSlot **slots, int ntuples, CommandId cid, int options, BulkInsertState bistate)
Definition: heapam.c:2068
TM_Result heap_lock_tuple(Relation relation, HeapTuple tuple, CommandId cid, LockTupleMode mode, LockWaitPolicy wait_policy, bool follow_update, Buffer *buffer, struct TM_FailureData *tmfd)
Definition: heapam.c:3944
void simple_heap_delete(Relation relation, ItemPointer tid)
Definition: heapam.c:2818
Definition: dynahash.c:210
bool HeapTupleSatisfiesVisibility(HeapTuple stup, Snapshot snapshot, Buffer buffer)
unsigned short uint16
Definition: c.h:366
bool heap_freeze_tuple(HeapTupleHeader tuple, TransactionId relfrozenxid, TransactionId relminmxid, TransactionId cutoff_xid, TransactionId cutoff_multi)
Definition: heapam.c:6347
BulkInsertState GetBulkInsertState(void)
Definition: heapam.c:1778
void heap_insert(Relation relation, HeapTuple tup, CommandId cid, int options, BulkInsertState bistate)
Definition: heapam.c:1831
BlockNumber rs_numblocks
Definition: heapam.h:54
bool XidInMVCCSnapshot(TransactionId xid, Snapshot snapshot)
Definition: snapmgr.c:2241
int heap_page_prune(Relation relation, Buffer buffer, TransactionId OldestXmin, bool report_stats, TransactionId *latestRemovedXid)
Definition: pruneheap.c:180
void heap_endscan(TableScanDesc scan)
Definition: heapam.c:1245
struct HeapScanDescData HeapScanDescData
Buffer xs_cbuf
Definition: heapam.h:82
static char * buf
Definition: pg_test_fsync.c:67
ScanDirection
Definition: sdir.h:22
static TransactionId OldestXmin
Definition: vacuumlazy.c:332
void setLastTid(const ItemPointer tid)
Definition: tid.c:281
unsigned int uint32
Definition: c.h:367
bool rs_inited
Definition: heapam.h:58
void simple_heap_insert(Relation relation, HeapTuple tup)
Definition: heapam.c:2355
BlockNumber rs_startblock
Definition: heapam.h:53
TM_Result heap_update(Relation relation, ItemPointer otid, HeapTuple newtup, CommandId cid, Snapshot crosscheck, bool wait, struct TM_FailureData *tmfd, LockTupleMode *lockmode)
Definition: heapam.c:2864
int rs_ntuples
Definition: heapam.h:70
void heap_finish_speculative(Relation relation, ItemPointer tid)
Definition: heapam.c:5446
static HTAB * tuplecid_data
Definition: snapmgr.c:172
bool heap_hot_search_buffer(ItemPointer tid, Relation relation, Buffer buffer, Snapshot snapshot, HeapTuple heapTuple, bool *all_dead, bool first_call)
Definition: heapam.c:1488
TM_Result
Definition: tableam.h:69
BlockNumber rs_nblocks
Definition: heapam.h:52
BufferAccessStrategy rs_strategy
Definition: heapam.h:64
Size SyncScanShmemSize(void)
Definition: syncscan.c:126
Buffer rs_cbuf
Definition: heapam.h:60
struct IndexFetchHeapData IndexFetchHeapData
TransactionId MultiXactId
Definition: c.h:523
void ss_report_location(Relation rel, BlockNumber location)
Definition: syncscan.c:288
OffsetNumber rs_vistuples[MaxHeapTuplesPerPage]
Definition: heapam.h:71
size_t Size
Definition: c.h:466
void heap_setscanlimits(TableScanDesc scan, BlockNumber startBlk, BlockNumber numBlks)
Definition: heapam.c:329
TM_Result heap_delete(Relation relation, ItemPointer tid, CommandId cid, Snapshot crosscheck, bool wait, struct TM_FailureData *tmfd, bool changingPart)
Definition: heapam.c:2413
struct BulkInsertStateData * BulkInsertState
Definition: heapam.h:39
bool heap_tuple_needs_freeze(HeapTupleHeader tuple, TransactionId cutoff_xid, MultiXactId cutoff_multi, Buffer buf)
Definition: heapam.c:6795
void FreeBulkInsertState(BulkInsertState)
Definition: heapam.c:1792
void heap_get_latest_tid(TableScanDesc scan, ItemPointer tid)
Definition: heapam.c:1633
TransactionId heap_compute_xid_horizon_for_tuples(Relation rel, ItemPointerData *items, int nitems)
Definition: heapam.c:6965
void heap_abort_speculative(Relation relation, ItemPointer tid)
Definition: heapam.c:5537
HeapTuple heap_getnext(TableScanDesc scan, ScanDirection direction)
Definition: heapam.c:1275
bool heap_getnextslot(TableScanDesc sscan, ScanDirection direction, struct TupleTableSlot *slot)
Definition: heapam.c:1314
void heap_page_prune_execute(Buffer buffer, OffsetNumber *redirected, int nredirected, OffsetNumber *nowdead, int ndead, OffsetNumber *nowunused, int nunused)
Definition: pruneheap.c:681
HTSV_Result
Definition: heapam.h:87
HTSV_Result HeapTupleSatisfiesVacuum(HeapTuple stup, TransactionId OldestXmin, Buffer buffer)
void heap_inplace_update(Relation relation, HeapTuple tuple)
Definition: heapam.c:5686
void heap_vacuum_rel(Relation onerel, struct VacuumParams *params, BufferAccessStrategy bstrategy)
Definition: vacuumlazy.c:413
void simple_heap_update(Relation relation, ItemPointer otid, HeapTuple tup)
Definition: heapam.c:3856
void HeapCheckForSerializableConflictOut(bool valid, Relation relation, HeapTuple tuple, Buffer buffer, Snapshot snapshot)
Definition: heapam.c:8992
int Buffer
Definition: buf.h:23
TableScanDesc heap_beginscan(Relation relation, Snapshot snapshot, int nkeys, ScanKey key, ParallelTableScanDesc parallel_scan, uint32 flags)
Definition: heapam.c:1132
LockWaitPolicy
Definition: lockoptions.h:36
void heap_rescan(TableScanDesc scan, ScanKey key, bool set_params, bool allow_strat, bool allow_sync, bool allow_pagemode)
Definition: heapam.c:1208
Pointer Page
Definition: bufpage.h:78
IndexFetchTableData xs_base
Definition: heapam.h:80
bool ResolveCminCmaxDuringDecoding(struct HTAB *tuplecid_data, Snapshot snapshot, HeapTuple htup, Buffer buffer, CommandId *cmin, CommandId *cmax)
TM_Result HeapTupleSatisfiesUpdate(HeapTuple stup, CommandId curcid, Buffer buffer)
BlockNumber ss_get_location(Relation rel, BlockNumber relnblocks)
Definition: syncscan.c:253
void heap_page_prune_opt(Relation relation, Buffer buffer)
Definition: pruneheap.c:73