mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-08-17 05:53:24 +02:00
CHECK_PAGE_OFFSET_RANGE() has been unused forever. CHECK_RELATION_BLOCK_RANGE() has been unused in pgstatindex.c ever since bt_page_stats() and bt_page_items() functions were moved from pgstattuple to pageinspect module. It still exists in pageinspect/btreefuncs.c. Daniel Gustafsson
470 lines
12 KiB
C
470 lines
12 KiB
C
/*
|
|
* contrib/pageinspect/btreefuncs.c
|
|
*
|
|
*
|
|
* btreefuncs.c
|
|
*
|
|
* Copyright (c) 2006 Satoshi Nagayasu <nagayasus@nttdata.co.jp>
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software and
|
|
* its documentation for any purpose, without fee, and without a
|
|
* written agreement is hereby granted, provided that the above
|
|
* copyright notice and this paragraph and the following two
|
|
* paragraphs appear in all copies.
|
|
*
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE TO ANY PARTY FOR DIRECT,
|
|
* INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
|
|
* LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
|
|
* DOCUMENTATION, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED
|
|
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* THE AUTHOR SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS
|
|
* IS" BASIS, AND THE AUTHOR HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE,
|
|
* SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
|
|
*/
|
|
|
|
#include "postgres.h"
|
|
|
|
#include "access/nbtree.h"
|
|
#include "catalog/namespace.h"
|
|
#include "catalog/pg_am.h"
|
|
#include "funcapi.h"
|
|
#include "miscadmin.h"
|
|
#include "utils/builtins.h"
|
|
#include "utils/rel.h"
|
|
|
|
|
|
PG_FUNCTION_INFO_V1(bt_metap);
|
|
PG_FUNCTION_INFO_V1(bt_page_items);
|
|
PG_FUNCTION_INFO_V1(bt_page_stats);
|
|
|
|
#define IS_INDEX(r) ((r)->rd_rel->relkind == RELKIND_INDEX)
|
|
#define IS_BTREE(r) ((r)->rd_rel->relam == BTREE_AM_OID)
|
|
|
|
/* note: BlockNumber is unsigned, hence can't be negative */
|
|
#define CHECK_RELATION_BLOCK_RANGE(rel, blkno) { \
|
|
if ( RelationGetNumberOfBlocks(rel) <= (BlockNumber) (blkno) ) \
|
|
elog(ERROR, "block number out of range"); }
|
|
|
|
/* ------------------------------------------------
|
|
* structure for single btree page statistics
|
|
* ------------------------------------------------
|
|
*/
|
|
typedef struct BTPageStat
|
|
{
|
|
uint32 blkno;
|
|
uint32 live_items;
|
|
uint32 dead_items;
|
|
uint32 page_size;
|
|
uint32 max_avail;
|
|
uint32 free_size;
|
|
uint32 avg_item_size;
|
|
char type;
|
|
|
|
/* opaque data */
|
|
BlockNumber btpo_prev;
|
|
BlockNumber btpo_next;
|
|
union
|
|
{
|
|
uint32 level;
|
|
TransactionId xact;
|
|
} btpo;
|
|
uint16 btpo_flags;
|
|
BTCycleId btpo_cycleid;
|
|
} BTPageStat;
|
|
|
|
|
|
/* -------------------------------------------------
|
|
* GetBTPageStatistics()
|
|
*
|
|
* Collect statistics of single b-tree page
|
|
* -------------------------------------------------
|
|
*/
|
|
static void
|
|
GetBTPageStatistics(BlockNumber blkno, Buffer buffer, BTPageStat *stat)
|
|
{
|
|
Page page = BufferGetPage(buffer);
|
|
PageHeader phdr = (PageHeader) page;
|
|
OffsetNumber maxoff = PageGetMaxOffsetNumber(page);
|
|
BTPageOpaque opaque = (BTPageOpaque) PageGetSpecialPointer(page);
|
|
int item_size = 0;
|
|
int off;
|
|
|
|
stat->blkno = blkno;
|
|
|
|
stat->max_avail = BLCKSZ - (BLCKSZ - phdr->pd_special + SizeOfPageHeaderData);
|
|
|
|
stat->dead_items = stat->live_items = 0;
|
|
|
|
stat->page_size = PageGetPageSize(page);
|
|
|
|
/* page type (flags) */
|
|
if (P_ISDELETED(opaque))
|
|
{
|
|
stat->type = 'd';
|
|
stat->btpo.xact = opaque->btpo.xact;
|
|
return;
|
|
}
|
|
else if (P_IGNORE(opaque))
|
|
stat->type = 'e';
|
|
else if (P_ISLEAF(opaque))
|
|
stat->type = 'l';
|
|
else if (P_ISROOT(opaque))
|
|
stat->type = 'r';
|
|
else
|
|
stat->type = 'i';
|
|
|
|
/* btpage opaque data */
|
|
stat->btpo_prev = opaque->btpo_prev;
|
|
stat->btpo_next = opaque->btpo_next;
|
|
stat->btpo.level = opaque->btpo.level;
|
|
stat->btpo_flags = opaque->btpo_flags;
|
|
stat->btpo_cycleid = opaque->btpo_cycleid;
|
|
|
|
/* count live and dead tuples, and free space */
|
|
for (off = FirstOffsetNumber; off <= maxoff; off++)
|
|
{
|
|
IndexTuple itup;
|
|
|
|
ItemId id = PageGetItemId(page, off);
|
|
|
|
itup = (IndexTuple) PageGetItem(page, id);
|
|
|
|
item_size += IndexTupleSize(itup);
|
|
|
|
if (!ItemIdIsDead(id))
|
|
stat->live_items++;
|
|
else
|
|
stat->dead_items++;
|
|
}
|
|
stat->free_size = PageGetFreeSpace(page);
|
|
|
|
if ((stat->live_items + stat->dead_items) > 0)
|
|
stat->avg_item_size = item_size / (stat->live_items + stat->dead_items);
|
|
else
|
|
stat->avg_item_size = 0;
|
|
}
|
|
|
|
/* -----------------------------------------------
|
|
* bt_page_stats()
|
|
*
|
|
* Usage: SELECT * FROM bt_page_stats('t1_pkey', 1);
|
|
* -----------------------------------------------
|
|
*/
|
|
Datum
|
|
bt_page_stats(PG_FUNCTION_ARGS)
|
|
{
|
|
text *relname = PG_GETARG_TEXT_P(0);
|
|
uint32 blkno = PG_GETARG_UINT32(1);
|
|
Buffer buffer;
|
|
Relation rel;
|
|
RangeVar *relrv;
|
|
Datum result;
|
|
HeapTuple tuple;
|
|
TupleDesc tupleDesc;
|
|
int j;
|
|
char *values[11];
|
|
BTPageStat stat;
|
|
|
|
if (!superuser())
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
|
|
(errmsg("must be superuser to use pageinspect functions"))));
|
|
|
|
relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
|
|
rel = relation_openrv(relrv, AccessShareLock);
|
|
|
|
if (!IS_INDEX(rel) || !IS_BTREE(rel))
|
|
elog(ERROR, "relation \"%s\" is not a btree index",
|
|
RelationGetRelationName(rel));
|
|
|
|
/*
|
|
* Reject attempts to read non-local temporary relations; we would be
|
|
* likely to get wrong data since we have no visibility into the owning
|
|
* session's local buffers.
|
|
*/
|
|
if (RELATION_IS_OTHER_TEMP(rel))
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
|
errmsg("cannot access temporary tables of other sessions")));
|
|
|
|
if (blkno == 0)
|
|
elog(ERROR, "block 0 is a meta page");
|
|
|
|
CHECK_RELATION_BLOCK_RANGE(rel, blkno);
|
|
|
|
buffer = ReadBuffer(rel, blkno);
|
|
LockBuffer(buffer, BUFFER_LOCK_SHARE);
|
|
|
|
/* keep compiler quiet */
|
|
stat.btpo_prev = stat.btpo_next = InvalidBlockNumber;
|
|
stat.btpo_flags = stat.free_size = stat.avg_item_size = 0;
|
|
|
|
GetBTPageStatistics(blkno, buffer, &stat);
|
|
|
|
UnlockReleaseBuffer(buffer);
|
|
relation_close(rel, AccessShareLock);
|
|
|
|
/* Build a tuple descriptor for our result type */
|
|
if (get_call_result_type(fcinfo, NULL, &tupleDesc) != TYPEFUNC_COMPOSITE)
|
|
elog(ERROR, "return type must be a row type");
|
|
|
|
j = 0;
|
|
values[j++] = psprintf("%d", stat.blkno);
|
|
values[j++] = psprintf("%c", stat.type);
|
|
values[j++] = psprintf("%d", stat.live_items);
|
|
values[j++] = psprintf("%d", stat.dead_items);
|
|
values[j++] = psprintf("%d", stat.avg_item_size);
|
|
values[j++] = psprintf("%d", stat.page_size);
|
|
values[j++] = psprintf("%d", stat.free_size);
|
|
values[j++] = psprintf("%d", stat.btpo_prev);
|
|
values[j++] = psprintf("%d", stat.btpo_next);
|
|
values[j++] = psprintf("%d", (stat.type == 'd') ? stat.btpo.xact : stat.btpo.level);
|
|
values[j++] = psprintf("%d", stat.btpo_flags);
|
|
|
|
tuple = BuildTupleFromCStrings(TupleDescGetAttInMetadata(tupleDesc),
|
|
values);
|
|
|
|
result = HeapTupleGetDatum(tuple);
|
|
|
|
PG_RETURN_DATUM(result);
|
|
}
|
|
|
|
/*-------------------------------------------------------
|
|
* bt_page_items()
|
|
*
|
|
* Get IndexTupleData set in a btree page
|
|
*
|
|
* Usage: SELECT * FROM bt_page_items('t1_pkey', 1);
|
|
*-------------------------------------------------------
|
|
*/
|
|
|
|
/*
|
|
* cross-call data structure for SRF
|
|
*/
|
|
struct user_args
|
|
{
|
|
Page page;
|
|
OffsetNumber offset;
|
|
};
|
|
|
|
Datum
|
|
bt_page_items(PG_FUNCTION_ARGS)
|
|
{
|
|
text *relname = PG_GETARG_TEXT_P(0);
|
|
uint32 blkno = PG_GETARG_UINT32(1);
|
|
Datum result;
|
|
char *values[6];
|
|
HeapTuple tuple;
|
|
FuncCallContext *fctx;
|
|
MemoryContext mctx;
|
|
struct user_args *uargs;
|
|
|
|
if (!superuser())
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
|
|
(errmsg("must be superuser to use pageinspect functions"))));
|
|
|
|
if (SRF_IS_FIRSTCALL())
|
|
{
|
|
RangeVar *relrv;
|
|
Relation rel;
|
|
Buffer buffer;
|
|
BTPageOpaque opaque;
|
|
TupleDesc tupleDesc;
|
|
|
|
fctx = SRF_FIRSTCALL_INIT();
|
|
|
|
relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
|
|
rel = relation_openrv(relrv, AccessShareLock);
|
|
|
|
if (!IS_INDEX(rel) || !IS_BTREE(rel))
|
|
elog(ERROR, "relation \"%s\" is not a btree index",
|
|
RelationGetRelationName(rel));
|
|
|
|
/*
|
|
* Reject attempts to read non-local temporary relations; we would be
|
|
* likely to get wrong data since we have no visibility into the
|
|
* owning session's local buffers.
|
|
*/
|
|
if (RELATION_IS_OTHER_TEMP(rel))
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
|
errmsg("cannot access temporary tables of other sessions")));
|
|
|
|
if (blkno == 0)
|
|
elog(ERROR, "block 0 is a meta page");
|
|
|
|
CHECK_RELATION_BLOCK_RANGE(rel, blkno);
|
|
|
|
buffer = ReadBuffer(rel, blkno);
|
|
LockBuffer(buffer, BUFFER_LOCK_SHARE);
|
|
|
|
/*
|
|
* We copy the page into local storage to avoid holding pin on the
|
|
* buffer longer than we must, and possibly failing to release it at
|
|
* all if the calling query doesn't fetch all rows.
|
|
*/
|
|
mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
|
|
|
|
uargs = palloc(sizeof(struct user_args));
|
|
|
|
uargs->page = palloc(BLCKSZ);
|
|
memcpy(uargs->page, BufferGetPage(buffer), BLCKSZ);
|
|
|
|
UnlockReleaseBuffer(buffer);
|
|
relation_close(rel, AccessShareLock);
|
|
|
|
uargs->offset = FirstOffsetNumber;
|
|
|
|
opaque = (BTPageOpaque) PageGetSpecialPointer(uargs->page);
|
|
|
|
if (P_ISDELETED(opaque))
|
|
elog(NOTICE, "page is deleted");
|
|
|
|
fctx->max_calls = PageGetMaxOffsetNumber(uargs->page);
|
|
|
|
/* Build a tuple descriptor for our result type */
|
|
if (get_call_result_type(fcinfo, NULL, &tupleDesc) != TYPEFUNC_COMPOSITE)
|
|
elog(ERROR, "return type must be a row type");
|
|
|
|
fctx->attinmeta = TupleDescGetAttInMetadata(tupleDesc);
|
|
|
|
fctx->user_fctx = uargs;
|
|
|
|
MemoryContextSwitchTo(mctx);
|
|
}
|
|
|
|
fctx = SRF_PERCALL_SETUP();
|
|
uargs = fctx->user_fctx;
|
|
|
|
if (fctx->call_cntr < fctx->max_calls)
|
|
{
|
|
ItemId id;
|
|
IndexTuple itup;
|
|
int j;
|
|
int off;
|
|
int dlen;
|
|
char *dump;
|
|
char *ptr;
|
|
|
|
id = PageGetItemId(uargs->page, uargs->offset);
|
|
|
|
if (!ItemIdIsValid(id))
|
|
elog(ERROR, "invalid ItemId");
|
|
|
|
itup = (IndexTuple) PageGetItem(uargs->page, id);
|
|
|
|
j = 0;
|
|
values[j++] = psprintf("%d", uargs->offset);
|
|
values[j++] = psprintf("(%u,%u)",
|
|
BlockIdGetBlockNumber(&(itup->t_tid.ip_blkid)),
|
|
itup->t_tid.ip_posid);
|
|
values[j++] = psprintf("%d", (int) IndexTupleSize(itup));
|
|
values[j++] = psprintf("%c", IndexTupleHasNulls(itup) ? 't' : 'f');
|
|
values[j++] = psprintf("%c", IndexTupleHasVarwidths(itup) ? 't' : 'f');
|
|
|
|
ptr = (char *) itup + IndexInfoFindDataOffset(itup->t_info);
|
|
dlen = IndexTupleSize(itup) - IndexInfoFindDataOffset(itup->t_info);
|
|
dump = palloc0(dlen * 3 + 1);
|
|
values[j] = dump;
|
|
for (off = 0; off < dlen; off++)
|
|
{
|
|
if (off > 0)
|
|
*dump++ = ' ';
|
|
sprintf(dump, "%02x", *(ptr + off) & 0xff);
|
|
dump += 2;
|
|
}
|
|
|
|
tuple = BuildTupleFromCStrings(fctx->attinmeta, values);
|
|
result = HeapTupleGetDatum(tuple);
|
|
|
|
uargs->offset = uargs->offset + 1;
|
|
|
|
SRF_RETURN_NEXT(fctx, result);
|
|
}
|
|
else
|
|
{
|
|
pfree(uargs->page);
|
|
pfree(uargs);
|
|
SRF_RETURN_DONE(fctx);
|
|
}
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------
|
|
* bt_metap()
|
|
*
|
|
* Get a btree's meta-page information
|
|
*
|
|
* Usage: SELECT * FROM bt_metap('t1_pkey')
|
|
* ------------------------------------------------
|
|
*/
|
|
Datum
|
|
bt_metap(PG_FUNCTION_ARGS)
|
|
{
|
|
text *relname = PG_GETARG_TEXT_P(0);
|
|
Datum result;
|
|
Relation rel;
|
|
RangeVar *relrv;
|
|
BTMetaPageData *metad;
|
|
TupleDesc tupleDesc;
|
|
int j;
|
|
char *values[6];
|
|
Buffer buffer;
|
|
Page page;
|
|
HeapTuple tuple;
|
|
|
|
if (!superuser())
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
|
|
(errmsg("must be superuser to use pageinspect functions"))));
|
|
|
|
relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
|
|
rel = relation_openrv(relrv, AccessShareLock);
|
|
|
|
if (!IS_INDEX(rel) || !IS_BTREE(rel))
|
|
elog(ERROR, "relation \"%s\" is not a btree index",
|
|
RelationGetRelationName(rel));
|
|
|
|
/*
|
|
* Reject attempts to read non-local temporary relations; we would be
|
|
* likely to get wrong data since we have no visibility into the owning
|
|
* session's local buffers.
|
|
*/
|
|
if (RELATION_IS_OTHER_TEMP(rel))
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
|
errmsg("cannot access temporary tables of other sessions")));
|
|
|
|
buffer = ReadBuffer(rel, 0);
|
|
LockBuffer(buffer, BUFFER_LOCK_SHARE);
|
|
|
|
page = BufferGetPage(buffer);
|
|
metad = BTPageGetMeta(page);
|
|
|
|
/* Build a tuple descriptor for our result type */
|
|
if (get_call_result_type(fcinfo, NULL, &tupleDesc) != TYPEFUNC_COMPOSITE)
|
|
elog(ERROR, "return type must be a row type");
|
|
|
|
j = 0;
|
|
values[j++] = psprintf("%d", metad->btm_magic);
|
|
values[j++] = psprintf("%d", metad->btm_version);
|
|
values[j++] = psprintf("%d", metad->btm_root);
|
|
values[j++] = psprintf("%d", metad->btm_level);
|
|
values[j++] = psprintf("%d", metad->btm_fastroot);
|
|
values[j++] = psprintf("%d", metad->btm_fastlevel);
|
|
|
|
tuple = BuildTupleFromCStrings(TupleDescGetAttInMetadata(tupleDesc),
|
|
values);
|
|
|
|
result = HeapTupleGetDatum(tuple);
|
|
|
|
UnlockReleaseBuffer(buffer);
|
|
relation_close(rel, AccessShareLock);
|
|
|
|
PG_RETURN_DATUM(result);
|
|
}
|