*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/hash/hash.c,v 1.66 2003/09/02 02:18:38 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/hash/hash.c,v 1.67 2003/09/02 18:13:29 tgl Exp $
*
* NOTES
* This file contains only the public interface routines.
BlockNumber num_pages;
double tuples_removed;
double num_index_tuples;
- uint32 deleted_tuples;
- uint32 tuples_remaining;
- uint32 orig_ntuples;
+ double orig_ntuples;
Bucket orig_maxbucket;
Bucket cur_maxbucket;
Bucket cur_bucket;
HashMetaPage metap;
HashMetaPageData local_metapage;
- /*
- * keep track of counts in both float form (to return) and integer form
- * (to update hashm_ntuples). It'd be better to make hashm_ntuples a
- * double, but that will have to wait for an initdb.
- */
tuples_removed = 0;
num_index_tuples = 0;
- deleted_tuples = 0;
- tuples_remaining = 0;
/*
* Read the metapage to fetch original bucket and tuple counts. Also,
*/
metabuf = _hash_getbuf(rel, HASH_METAPAGE, HASH_READ);
metap = (HashMetaPage) BufferGetPage(metabuf);
- _hash_checkpage((Page) metap, LH_META_PAGE);
+ _hash_checkpage(rel, (Page) metap, LH_META_PAGE);
orig_maxbucket = metap->hashm_maxbucket;
orig_ntuples = metap->hashm_ntuples;
memcpy(&local_metapage, metap, sizeof(local_metapage));
buf = _hash_getbuf(rel, blkno, HASH_WRITE);
page = BufferGetPage(buf);
- _hash_checkpage(page, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
+ _hash_checkpage(rel, page, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
opaque = (HashPageOpaque) PageGetSpecialPointer(page);
Assert(opaque->hasho_bucket == cur_bucket);
maxoffno = OffsetNumberPrev(maxoffno);
tuples_removed += 1;
- deleted_tuples += 1;
}
else
{
offno = OffsetNumberNext(offno);
num_index_tuples += 1;
- tuples_remaining += 1;
}
}
/* Write-lock metapage and check for split since we started */
metabuf = _hash_getbuf(rel, HASH_METAPAGE, HASH_WRITE);
metap = (HashMetaPage) BufferGetPage(metabuf);
- _hash_checkpage((Page) metap, LH_META_PAGE);
+ _hash_checkpage(rel, (Page) metap, LH_META_PAGE);
if (cur_maxbucket != metap->hashm_maxbucket)
{
* No one has split or inserted anything since start of scan,
* so believe our count as gospel.
*/
- metap->hashm_ntuples = tuples_remaining;
+ metap->hashm_ntuples = num_index_tuples;
}
else
{
* double-scanned tuples in split buckets. Proceed by
* dead-reckoning.
*/
- if (metap->hashm_ntuples > deleted_tuples)
- metap->hashm_ntuples -= deleted_tuples;
+ if (metap->hashm_ntuples > tuples_removed)
+ metap->hashm_ntuples -= tuples_removed;
else
metap->hashm_ntuples = 0;
num_index_tuples = metap->hashm_ntuples;
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/hash/hashinsert.c,v 1.28 2003/09/01 20:26:34 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/hash/hashinsert.c,v 1.29 2003/09/02 18:13:30 tgl Exp $
*
*-------------------------------------------------------------------------
*/
metabuf = _hash_getbuf(rel, HASH_METAPAGE, HASH_READ);
metap = (HashMetaPage) BufferGetPage(metabuf);
- _hash_checkpage((Page) metap, LH_META_PAGE);
+ _hash_checkpage(rel, (Page) metap, LH_META_PAGE);
/* we need a scan key to do our search, so build one */
itup = &(hitem->hash_itup);
*/
_hash_search(rel, natts, itup_scankey, &buf, metap);
page = BufferGetPage(buf);
- _hash_checkpage(page, LH_BUCKET_PAGE);
+ _hash_checkpage(rel, page, LH_BUCKET_PAGE);
/*
* trade in our read lock for a write lock so that we can do the
Bucket bucket;
metap = (HashMetaPage) BufferGetPage(metabuf);
- _hash_checkpage((Page) metap, LH_META_PAGE);
+ _hash_checkpage(rel, (Page) metap, LH_META_PAGE);
page = BufferGetPage(buf);
- _hash_checkpage(page, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
+ _hash_checkpage(rel, page, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
pageopaque = (HashPageOpaque) PageGetSpecialPointer(page);
bucket = pageopaque->hasho_bucket;
elog(ERROR, "hash item too large");
}
}
- _hash_checkpage(page, LH_OVERFLOW_PAGE);
+ _hash_checkpage(rel, page, LH_OVERFLOW_PAGE);
pageopaque = (HashPageOpaque) PageGetSpecialPointer(page);
Assert(pageopaque->hasho_bucket == bucket);
}
if (do_expand ||
(metap->hashm_ntuples / (metap->hashm_maxbucket + 1))
- > metap->hashm_ffactor)
+ > (double) metap->hashm_ffactor)
_hash_expandtable(rel, metabuf);
_hash_relbuf(rel, metabuf, HASH_READ);
return res;
Page page;
page = BufferGetPage(buf);
- _hash_checkpage(page, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
+ _hash_checkpage(rel, page, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
itup_off = OffsetNumberNext(PageGetMaxOffsetNumber(page));
if (PageAddItem(page, (Item) hitem, itemsize, itup_off, LP_USED)
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/hash/hashovfl.c,v 1.39 2003/09/02 02:18:38 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/hash/hashovfl.c,v 1.40 2003/09/02 18:13:30 tgl Exp $
*
* NOTES
* Overflow pages look like ordinary relation pages.
/* this had better be the last page in a bucket chain */
page = BufferGetPage(buf);
- _hash_checkpage(page, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
+ _hash_checkpage(rel, page, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
pageopaque = (HashPageOpaque) PageGetSpecialPointer(page);
Assert(!BlockNumberIsValid(pageopaque->hasho_nextblkno));
metap = (HashMetaPage) BufferGetPage(metabuf);
- _hash_checkpage((Page) metap, LH_META_PAGE);
+ _hash_checkpage(rel, (Page) metap, LH_META_PAGE);
/* allocate an empty overflow page */
ovflblkno = _hash_getovflpage(rel, metabuf);
ovflopaque = (HashPageOpaque) PageGetSpecialPointer(ovflpage);
ovflopaque->hasho_prevblkno = BufferGetBlockNumber(buf);
ovflopaque->hasho_nextblkno = InvalidBlockNumber;
- ovflopaque->hasho_flag = LH_OVERFLOW_PAGE;
- ovflopaque->hasho_oaddr = 0;
ovflopaque->hasho_bucket = pageopaque->hasho_bucket;
+ ovflopaque->hasho_flag = LH_OVERFLOW_PAGE;
+ ovflopaque->hasho_filler = HASHO_FILL;
_hash_wrtnorelbuf(ovflbuf);
/* logically chain overflow page to previous page */
mapblkno = metap->hashm_mapp[i];
mapbuf = _hash_getbuf(rel, mapblkno, HASH_WRITE);
mappage = BufferGetPage(mapbuf);
- _hash_checkpage(mappage, LH_BITMAP_PAGE);
+ _hash_checkpage(rel, mappage, LH_BITMAP_PAGE);
freep = HashPageGetBitmap(mappage);
if (i != first_page)
metabuf = _hash_getbuf(rel, HASH_METAPAGE, HASH_WRITE);
metap = (HashMetaPage) BufferGetPage(metabuf);
- _hash_checkpage((Page) metap, LH_META_PAGE);
+ _hash_checkpage(rel, (Page) metap, LH_META_PAGE);
ovflblkno = BufferGetBlockNumber(ovflbuf);
ovflpage = BufferGetPage(ovflbuf);
- _hash_checkpage(ovflpage, LH_OVERFLOW_PAGE);
+ _hash_checkpage(rel, ovflpage, LH_OVERFLOW_PAGE);
ovflopaque = (HashPageOpaque) PageGetSpecialPointer(ovflpage);
nextblkno = ovflopaque->hasho_nextblkno;
prevblkno = ovflopaque->hasho_prevblkno;
Page prevpage = BufferGetPage(prevbuf);
HashPageOpaque prevopaque = (HashPageOpaque) PageGetSpecialPointer(prevpage);
- _hash_checkpage(prevpage, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
+ _hash_checkpage(rel, prevpage, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
Assert(prevopaque->hasho_bucket == bucket);
prevopaque->hasho_nextblkno = nextblkno;
_hash_wrtbuf(rel, prevbuf);
Page nextpage = BufferGetPage(nextbuf);
HashPageOpaque nextopaque = (HashPageOpaque) PageGetSpecialPointer(nextpage);
- _hash_checkpage(nextpage, LH_OVERFLOW_PAGE);
+ _hash_checkpage(rel, nextpage, LH_OVERFLOW_PAGE);
Assert(nextopaque->hasho_bucket == bucket);
nextopaque->hasho_prevblkno = prevblkno;
_hash_wrtbuf(rel, nextbuf);
mapbuf = _hash_getbuf(rel, blkno, HASH_WRITE);
mappage = BufferGetPage(mapbuf);
- _hash_checkpage(mappage, LH_BITMAP_PAGE);
+ _hash_checkpage(rel, mappage, LH_BITMAP_PAGE);
freep = HashPageGetBitmap(mappage);
CLRBIT(freep, bitmapbit);
_hash_wrtbuf(rel, mapbuf);
pg = BufferGetPage(buf);
_hash_pageinit(pg, BufferGetPageSize(buf));
op = (HashPageOpaque) PageGetSpecialPointer(pg);
- op->hasho_oaddr = 0;
op->hasho_prevblkno = InvalidBlockNumber;
op->hasho_nextblkno = InvalidBlockNumber;
- op->hasho_flag = LH_BITMAP_PAGE;
op->hasho_bucket = -1;
+ op->hasho_flag = LH_BITMAP_PAGE;
+ op->hasho_filler = HASHO_FILL;
/* set all of the bits to 1 */
freep = HashPageGetBitmap(pg);
wblkno = bucket_blkno;
wbuf = _hash_getbuf(rel, wblkno, HASH_WRITE);
wpage = BufferGetPage(wbuf);
- _hash_checkpage(wpage, LH_BUCKET_PAGE);
+ _hash_checkpage(rel, wpage, LH_BUCKET_PAGE);
wopaque = (HashPageOpaque) PageGetSpecialPointer(wpage);
/*
_hash_relbuf(rel, rbuf, HASH_WRITE);
rbuf = _hash_getbuf(rel, rblkno, HASH_WRITE);
rpage = BufferGetPage(rbuf);
- _hash_checkpage(rpage, LH_OVERFLOW_PAGE);
+ _hash_checkpage(rel, rpage, LH_OVERFLOW_PAGE);
Assert(!PageIsEmpty(rpage));
ropaque = (HashPageOpaque) PageGetSpecialPointer(rpage);
Assert(ropaque->hasho_bucket == bucket);
wbuf = _hash_getbuf(rel, wblkno, HASH_WRITE);
wpage = BufferGetPage(wbuf);
- _hash_checkpage(wpage, LH_OVERFLOW_PAGE);
+ _hash_checkpage(rel, wpage, LH_OVERFLOW_PAGE);
Assert(!PageIsEmpty(wpage));
wopaque = (HashPageOpaque) PageGetSpecialPointer(wpage);
Assert(wopaque->hasho_bucket == bucket);
rbuf = _hash_getbuf(rel, rblkno, HASH_WRITE);
rpage = BufferGetPage(rbuf);
- _hash_checkpage(rpage, LH_OVERFLOW_PAGE);
+ _hash_checkpage(rel, rpage, LH_OVERFLOW_PAGE);
Assert(!PageIsEmpty(rpage));
ropaque = (HashPageOpaque) PageGetSpecialPointer(rpage);
Assert(ropaque->hasho_bucket == bucket);
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/hash/hashpage.c,v 1.40 2003/09/02 02:18:38 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/hash/hashpage.c,v 1.41 2003/09/02 18:13:31 tgl Exp $
*
* NOTES
* Postgres hash pages look like ordinary relation pages. The opaque
_hash_pageinit(pg, BufferGetPageSize(metabuf));
pageopaque = (HashPageOpaque) PageGetSpecialPointer(pg);
- pageopaque->hasho_oaddr = 0;
pageopaque->hasho_prevblkno = InvalidBlockNumber;
pageopaque->hasho_nextblkno = InvalidBlockNumber;
- pageopaque->hasho_flag = LH_META_PAGE;
pageopaque->hasho_bucket = -1;
+ pageopaque->hasho_flag = LH_META_PAGE;
+ pageopaque->hasho_filler = HASHO_FILL;
metap = (HashMetaPage) pg;
metap->hashm_nmaps = 0;
metap->hashm_ffactor = DEFAULT_FFACTOR;
metap->hashm_bsize = BufferGetPageSize(metabuf);
- metap->hashm_bshift = _hash_log2(metap->hashm_bsize);
- /* page size must be power of 2 */
- Assert(metap->hashm_bsize == (1 << metap->hashm_bshift));
- /* bitmap size is half of page size, to keep it also power of 2 */
- metap->hashm_bmsize = (metap->hashm_bsize >> 1);
- Assert(metap->hashm_bsize >= metap->hashm_bmsize +
- MAXALIGN(sizeof(PageHeaderData)) +
- MAXALIGN(sizeof(HashPageOpaqueData)));
+ /* find largest bitmap array size that will fit in page size */
+ for (i = _hash_log2(metap->hashm_bsize); i > 0; --i)
+ {
+ if ((1 << i) <= (metap->hashm_bsize -
+ (MAXALIGN(sizeof(PageHeaderData)) +
+ MAXALIGN(sizeof(HashPageOpaqueData)))))
+ break;
+ }
+ Assert(i > 0);
+ metap->hashm_bmsize = 1 << i;
+ metap->hashm_bmshift = i + BYTE_TO_BIT;
Assert((1 << BMPG_SHIFT(metap)) == (BMPG_MASK(metap) + 1));
metap->hashm_procid = index_getprocid(rel, 1, HASHPROC);
pg = BufferGetPage(buf);
_hash_pageinit(pg, BufferGetPageSize(buf));
pageopaque = (HashPageOpaque) PageGetSpecialPointer(pg);
- pageopaque->hasho_oaddr = 0;
pageopaque->hasho_prevblkno = InvalidBlockNumber;
pageopaque->hasho_nextblkno = InvalidBlockNumber;
- pageopaque->hasho_flag = LH_BUCKET_PAGE;
pageopaque->hasho_bucket = i;
+ pageopaque->hasho_flag = LH_BUCKET_PAGE;
+ pageopaque->hasho_filler = HASHO_FILL;
_hash_wrtbuf(rel, buf);
}
}
}
-/*
- * Delete a hash index item.
- *
- * It is safe to delete an item after acquiring a regular WRITE lock on
- * the page, because no other backend can hold a READ lock on the page,
- * and that means no other backend currently has an indexscan stopped on
- * any item of the item being deleted. Our own backend might have such
- * an indexscan (in fact *will*, since that's how VACUUM found the item
- * in the first place), but _hash_adjscans will fix the scan position.
- */
-void
-_hash_pagedel(Relation rel, ItemPointer tid)
-{
- Buffer buf;
- Buffer metabuf;
- Page page;
- BlockNumber blkno;
- OffsetNumber offno;
- HashMetaPage metap;
- HashPageOpaque opaque;
-
- blkno = ItemPointerGetBlockNumber(tid);
- offno = ItemPointerGetOffsetNumber(tid);
-
- buf = _hash_getbuf(rel, blkno, HASH_WRITE);
- page = BufferGetPage(buf);
- _hash_checkpage(page, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
- opaque = (HashPageOpaque) PageGetSpecialPointer(page);
-
- PageIndexTupleDelete(page, offno);
-
- if (PageIsEmpty(page) && (opaque->hasho_flag & LH_OVERFLOW_PAGE))
- _hash_freeovflpage(rel, buf);
- else
- _hash_wrtbuf(rel, buf);
-
- metabuf = _hash_getbuf(rel, HASH_METAPAGE, HASH_WRITE);
- metap = (HashMetaPage) BufferGetPage(metabuf);
- _hash_checkpage((Page) metap, LH_META_PAGE);
- metap->hashm_ntuples--;
- _hash_wrtbuf(rel, metabuf);
-}
-
/*
* Expand the hash table by creating one new bucket.
*/
uint32 spare_ndx;
metap = (HashMetaPage) BufferGetPage(metabuf);
- _hash_checkpage((Page) metap, LH_META_PAGE);
+ _hash_checkpage(rel, (Page) metap, LH_META_PAGE);
_hash_chgbufaccess(rel, metabuf, HASH_READ, HASH_WRITE);
TupleDesc itupdesc = RelationGetDescr(rel);
metap = (HashMetaPage) BufferGetPage(metabuf);
- _hash_checkpage((Page) metap, LH_META_PAGE);
+ _hash_checkpage(rel, (Page) metap, LH_META_PAGE);
/* get the buffers & pages */
start_oblkno = BUCKET_TO_BLKNO(metap, obucket);
nopaque = (HashPageOpaque) PageGetSpecialPointer(npage);
nopaque->hasho_prevblkno = InvalidBlockNumber;
nopaque->hasho_nextblkno = InvalidBlockNumber;
- nopaque->hasho_flag = LH_BUCKET_PAGE;
- nopaque->hasho_oaddr = 0;
nopaque->hasho_bucket = nbucket;
+ nopaque->hasho_flag = LH_BUCKET_PAGE;
+ nopaque->hasho_filler = HASHO_FILL;
_hash_wrtnorelbuf(nbuf);
/*
* XXX we should only need this once, if we are careful to preserve the
* invariant that overflow pages are never empty.
*/
- _hash_checkpage(opage, LH_BUCKET_PAGE);
+ _hash_checkpage(rel, opage, LH_BUCKET_PAGE);
oopaque = (HashPageOpaque) PageGetSpecialPointer(opage);
if (PageIsEmpty(opage))
{
}
obuf = _hash_getbuf(rel, oblkno, HASH_WRITE);
opage = BufferGetPage(obuf);
- _hash_checkpage(opage, LH_OVERFLOW_PAGE);
+ _hash_checkpage(rel, opage, LH_OVERFLOW_PAGE);
if (PageIsEmpty(opage))
elog(ERROR, "empty hash overflow page %u", oblkno);
oopaque = (HashPageOpaque) PageGetSpecialPointer(opage);
_hash_wrtbuf(rel, obuf);
obuf = _hash_getbuf(rel, oblkno, HASH_WRITE);
opage = BufferGetPage(obuf);
- _hash_checkpage(opage, LH_OVERFLOW_PAGE);
+ _hash_checkpage(rel, opage, LH_OVERFLOW_PAGE);
oopaque = (HashPageOpaque) PageGetSpecialPointer(opage);
/* we're guaranteed that an ovfl page has at least 1 tuple */
if (PageIsEmpty(opage))
_hash_wrtbuf(rel, nbuf);
nbuf = ovflbuf;
npage = BufferGetPage(nbuf);
- _hash_checkpage(npage, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
+ _hash_checkpage(rel, npage, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
}
noffnum = OffsetNumberNext(PageGetMaxOffsetNumber(npage));
*/
obuf = _hash_getbuf(rel, oblkno, HASH_WRITE);
opage = BufferGetPage(obuf);
- _hash_checkpage(opage, LH_OVERFLOW_PAGE);
+ _hash_checkpage(rel, opage, LH_OVERFLOW_PAGE);
oopaque = (HashPageOpaque) PageGetSpecialPointer(opage);
if (PageIsEmpty(opage))
elog(ERROR, "empty hash overflow page %u", oblkno);
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/hash/hashsearch.c,v 1.32 2003/09/02 02:18:38 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/hash/hashsearch.c,v 1.33 2003/09/02 18:13:31 tgl Exp $
*
*-------------------------------------------------------------------------
*/
BlockNumber blkno;
Bucket bucket;
- if (scankey == NULL)
+ if (scankey == NULL ||
+ (scankey[0].sk_flags & SK_ISNULL))
{
/*
* If the scankey is empty, all tuples will satisfy the
* scan so we start the scan at the first bucket (bucket 0).
+ *
+ * If the scankey is NULL, no tuples will satisfy the search;
+ * this should have been checked already, but arbitrarily return
+ * bucket zero.
*/
bucket = 0;
}
else
{
- Assert(!(scankey[0].sk_flags & SK_ISNULL));
bucket = _hash_call(rel, metap, scankey[0].sk_argument);
}
current = &(scan->currentItemData);
offnum = ItemPointerGetOffsetNumber(current);
page = BufferGetPage(buf);
- _hash_checkpage(page, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
+ _hash_checkpage(rel, page, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
hitem = (HashItem) PageGetItem(page, PageGetItemId(page, offnum));
itup = &hitem->hash_itup;
scan->xs_ctup.t_self = itup->t_tid;
{
*bufp = _hash_getbuf(rel, blkno, HASH_READ);
*pagep = BufferGetPage(*bufp);
- _hash_checkpage(*pagep, LH_OVERFLOW_PAGE);
+ _hash_checkpage(rel, *pagep, LH_OVERFLOW_PAGE);
*opaquep = (HashPageOpaque) PageGetSpecialPointer(*pagep);
Assert(!PageIsEmpty(*pagep));
}
{
*bufp = _hash_getbuf(rel, blkno, HASH_READ);
*pagep = BufferGetPage(*bufp);
- _hash_checkpage(*pagep, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
+ _hash_checkpage(rel, *pagep, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
*opaquep = (HashPageOpaque) PageGetSpecialPointer(*pagep);
if (PageIsEmpty(*pagep))
{
metabuf = _hash_getbuf(rel, HASH_METAPAGE, HASH_READ);
metap = (HashMetaPage) BufferGetPage(metabuf);
- _hash_checkpage((Page) metap, LH_META_PAGE);
+ _hash_checkpage(rel, (Page) metap, LH_META_PAGE);
/*
* XXX -- The attribute number stored in the scan key is the attno in
/* find the correct bucket page and load it into buf */
_hash_search(rel, 1, scan->keyData, &buf, metap);
page = BufferGetPage(buf);
- _hash_checkpage(page, LH_BUCKET_PAGE);
+ _hash_checkpage(rel, page, LH_BUCKET_PAGE);
opaque = (HashPageOpaque) PageGetSpecialPointer(page);
/*
current = &(scan->currentItemData);
offnum = ItemPointerGetOffsetNumber(current);
page = BufferGetPage(buf);
- _hash_checkpage(page, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
+ _hash_checkpage(rel, page, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
hitem = (HashItem) PageGetItem(page, PageGetItemId(page, offnum));
itup = &hitem->hash_itup;
scan->xs_ctup.t_self = itup->t_tid;
allbuckets = (scan->numberOfKeys < 1);
metap = (HashMetaPage) BufferGetPage(metabuf);
- _hash_checkpage((Page) metap, LH_META_PAGE);
+ _hash_checkpage(rel, (Page) metap, LH_META_PAGE);
buf = *bufP;
page = BufferGetPage(buf);
- _hash_checkpage(page, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
+ _hash_checkpage(rel, page, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
opaque = (HashPageOpaque) PageGetSpecialPointer(page);
/*
blkno = BUCKET_TO_BLKNO(metap, bucket);
buf = _hash_getbuf(rel, blkno, HASH_READ);
page = BufferGetPage(buf);
- _hash_checkpage(page, LH_BUCKET_PAGE);
+ _hash_checkpage(rel, page, LH_BUCKET_PAGE);
opaque = (HashPageOpaque) PageGetSpecialPointer(page);
Assert(opaque->hasho_bucket == bucket);
while (PageIsEmpty(page) &&
blkno = BUCKET_TO_BLKNO(metap, bucket);
buf = _hash_getbuf(rel, blkno, HASH_READ);
page = BufferGetPage(buf);
- _hash_checkpage(page, LH_BUCKET_PAGE);
+ _hash_checkpage(rel, page, LH_BUCKET_PAGE);
opaque = (HashPageOpaque) PageGetSpecialPointer(page);
Assert(opaque->hasho_bucket == bucket);
while (BlockNumberIsValid(opaque->hasho_nextblkno))
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/hash/hashutil.c,v 1.34 2003/09/02 02:18:38 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/hash/hashutil.c,v 1.35 2003/09/02 18:13:31 tgl Exp $
*
*-------------------------------------------------------------------------
*/
* _hash_checkpage -- sanity checks on the format of all hash pages
*/
void
-_hash_checkpage(Page page, int flags)
+_hash_checkpage(Relation rel, Page page, int flags)
{
-#ifdef USE_ASSERT_CHECKING
Assert(page);
+ /*
+ * When checking the metapage, always verify magic number and version.
+ */
+ if (flags == LH_META_PAGE)
+ {
+ HashMetaPage metap = (HashMetaPage) page;
+
+ if (metap->hashm_magic != HASH_MAGIC)
+ ereport(ERROR,
+ (errcode(ERRCODE_INDEX_CORRUPTED),
+ errmsg("index \"%s\" is not a hash index",
+ RelationGetRelationName(rel))));
+
+ if (metap->hashm_version != HASH_VERSION)
+ ereport(ERROR,
+ (errcode(ERRCODE_INDEX_CORRUPTED),
+ errmsg("index \"%s\" has wrong hash version, please REINDEX it",
+ RelationGetRelationName(rel))));
+ }
+
+ /*
+ * These other checks are for debugging purposes only.
+ */
+#ifdef USE_ASSERT_CHECKING
Assert(((PageHeader) (page))->pd_lower >= SizeOfPageHeaderData);
Assert(((PageHeader) (page))->pd_upper <=
(BLCKSZ - MAXALIGN(sizeof(HashPageOpaqueData))));
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: hash.h,v 1.51 2003/09/02 02:18:38 tgl Exp $
+ * $Id: hash.h,v 1.52 2003/09/02 18:13:32 tgl Exp $
*
* NOTES
* modeled after Margo Seltzer's hash implementation for unix.
typedef struct HashPageOpaqueData
{
- bits16 hasho_flag; /* page type code, see above */
- Bucket hasho_bucket; /* bucket number this pg belongs to */
- bits16 hasho_oaddr; /* no longer used; delete someday */
- BlockNumber hasho_nextblkno; /* next ovfl blkno */
BlockNumber hasho_prevblkno; /* previous ovfl (or bucket) blkno */
+ BlockNumber hasho_nextblkno; /* next ovfl blkno */
+ Bucket hasho_bucket; /* bucket number this pg belongs to */
+ uint16 hasho_flag; /* page type code, see above */
+ uint16 hasho_filler; /* available for future use */
+ /*
+ * We presently set hasho_filler to HASHO_FILL (0x1234); this is for
+ * the convenience of pg_filedump, which otherwise would have a hard
+ * time telling HashPageOpaqueData from BTPageOpaqueData. If we ever
+ * need that space for some other purpose, pg_filedump will have to
+ * find another way.
+ */
} HashPageOpaqueData;
typedef HashPageOpaqueData *HashPageOpaque;
+#define HASHO_FILL 0x1234
+
/*
* ScanOpaqueData is used to remember which buffers we're currently
* examining in the scan. We keep these buffers locked and pinned and
#define HASH_METAPAGE 0 /* metapage is always block 0 */
#define HASH_MAGIC 0x6440640
-#define HASH_VERSION 0
+#define HASH_VERSION 1 /* new for Pg 7.4 */
/*
* Spares[] holds the number of overflow pages currently allocated at or
*
* The limitation on the size of spares[] comes from the fact that there's
* no point in having more than 2^32 buckets with only uint32 hashcodes.
- * There is no particularly good reason for bitmaps[] to be the same size,
- * but we're stuck with that until we want to force an initdb. (With 8K
- * block size, 32 bitmaps limit us to 8 Gb of overflow space...)
+ * There is no particular upper limit on the size of mapp[], other than
+ * needing to fit into the metapage. (With 8K block size, 128 bitmaps
+ * limit us to 64 Gb of overflow space...)
*/
#define HASH_MAX_SPLITPOINTS 32
-#define HASH_MAX_BITMAPS 32
+#define HASH_MAX_BITMAPS 128
typedef struct HashMetaPageData
{
PageHeaderData hashm_phdr; /* pad for page header (do not use) */
uint32 hashm_magic; /* magic no. for hash tables */
uint32 hashm_version; /* version ID */
- uint32 hashm_ntuples; /* number of tuples stored in the table */
+ double hashm_ntuples; /* number of tuples stored in the table */
uint16 hashm_ffactor; /* target fill factor (tuples/bucket) */
- uint16 hashm_bsize; /* index page size (bytes) - must be a power
- * of 2 */
- uint16 hashm_bshift; /* log2(bsize) */
- uint16 hashm_bmsize; /* bitmap array size (bytes) - must be
- * exactly half of hashm_bsize */
+ uint16 hashm_bsize; /* index page size (bytes) */
+ uint16 hashm_bmsize; /* bitmap array size (bytes) - must be a
+ * power of 2 */
+ uint16 hashm_bmshift; /* log2(bitmap array size in BITS) */
uint32 hashm_maxbucket; /* ID of maximum bucket in use */
uint32 hashm_highmask; /* mask to modulo into entire table */
uint32 hashm_lowmask; /* mask to modulo into lower half of table */
* allocated */
uint32 hashm_firstfree; /* lowest-number free ovflpage (bit#) */
uint32 hashm_nmaps; /* number of bitmap pages */
+ RegProcedure hashm_procid; /* hash procedure id from pg_proc */
uint32 hashm_spares[HASH_MAX_SPLITPOINTS]; /* spare pages before
* each splitpoint */
BlockNumber hashm_mapp[HASH_MAX_BITMAPS]; /* blknos of ovfl bitmaps */
- RegProcedure hashm_procid; /* hash procedure id from pg_proc */
} HashMetaPageData;
typedef HashMetaPageData *HashMetaPage;
* Bitmap pages do not contain tuples. They do contain the standard
* page headers and trailers; however, everything in between is a
* giant bit array. The number of bits that fit on a page obviously
- * depends on the page size and the header/trailer overhead. In the
- * present implementation, we use exactly half of a page for bitmap,
- * so that we have a power-of-2 bits per page.
- *
- * The fact that the metapage has separate bsize and bmsize fields,
- * but only one bshift field, is a design error that ought to be fixed.
+ * depends on the page size and the header/trailer overhead. We require
+ * the number of bits per page to be a power of 2.
*/
#define BMPGSZ_BYTE(metap) ((metap)->hashm_bmsize)
#define BMPGSZ_BIT(metap) ((metap)->hashm_bmsize << BYTE_TO_BIT)
-#define BMPG_SHIFT(metap) ((metap)->hashm_bshift - 1 + BYTE_TO_BIT)
+#define BMPG_SHIFT(metap) ((metap)->hashm_bmshift)
#define BMPG_MASK(metap) (BMPGSZ_BIT(metap) - 1)
#define HashPageGetBitmap(pg) \
((uint32 *) (((char *) (pg)) + MAXALIGN(sizeof(PageHeaderData))))
extern void _hash_chgbufaccess(Relation rel, Buffer buf, int from_access,
int to_access);
extern void _hash_pageinit(Page page, Size size);
-extern void _hash_pagedel(Relation rel, ItemPointer tid);
extern void _hash_expandtable(Relation rel, Buffer metabuf);
/* hashscan.c */
extern HashItem _hash_formitem(IndexTuple itup);
extern Bucket _hash_call(Relation rel, HashMetaPage metap, Datum key);
extern uint32 _hash_log2(uint32 num);
-extern void _hash_checkpage(Page page, int flags);
+extern void _hash_checkpage(Relation rel, Page page, int flags);
/* hash.c */
extern void hash_redo(XLogRecPtr lsn, XLogRecord *record);
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