diff options
Diffstat (limited to 'src/include/storage/bufpage.h')
| -rw-r--r-- | src/include/storage/bufpage.h | 34 |
1 files changed, 30 insertions, 4 deletions
diff --git a/src/include/storage/bufpage.h b/src/include/storage/bufpage.h index 7e6e429108d..8ca2dd8e38f 100644 --- a/src/include/storage/bufpage.h +++ b/src/include/storage/bufpage.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/storage/bufpage.h,v 1.73 2007/09/12 22:10:26 tgl Exp $ + * $PostgreSQL: pgsql/src/include/storage/bufpage.h,v 1.74 2007/09/20 17:56:32 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -140,10 +140,21 @@ typedef PageHeaderData *PageHeader; * PD_HAS_FREE_LINES is set if there are any LP_UNUSED line pointers before * pd_lower. This should be considered a hint rather than the truth, since * changes to it are not WAL-logged. + * + * PD_PRUNABLE is set if there are any prunable tuples in the page. + * This should be considered a hint rather than the truth, since + * the transaction which generates a prunable tuple may or may not commit. + * Also there is a lag before a tuple is declared dead. + * + * PD_PAGE_FULL is set if an UPDATE doesn't find enough free space in the + * page for its new tuple version; this suggests that a prune is needed. + * Again, this is just a hint. */ #define PD_HAS_FREE_LINES 0x0001 /* are there any unused line pointers? */ +#define PD_PRUNABLE 0x0002 /* are there any prunable tuples? */ +#define PD_PAGE_FULL 0x0004 /* not enough free space for new tuple? */ -#define PD_VALID_FLAG_BITS 0x0001 /* OR of all valid pd_flags bits */ +#define PD_VALID_FLAG_BITS 0x0007 /* OR of all valid pd_flags bits */ /* * Page layout version number 0 is for pre-7.3 Postgres releases. @@ -337,6 +348,20 @@ typedef PageHeaderData *PageHeader; #define PageClearHasFreeLinePointers(page) \ (((PageHeader) (page))->pd_flags &= ~PD_HAS_FREE_LINES) +#define PageIsPrunable(page) \ + (((PageHeader) (page))->pd_flags & PD_PRUNABLE) +#define PageSetPrunable(page) \ + (((PageHeader) (page))->pd_flags |= PD_PRUNABLE) +#define PageClearPrunable(page) \ + (((PageHeader) (page))->pd_flags &= ~PD_PRUNABLE) + +#define PageIsFull(page) \ + (((PageHeader) (page))->pd_flags & PD_PAGE_FULL) +#define PageSetFull(page) \ + (((PageHeader) (page))->pd_flags |= PD_PAGE_FULL) +#define PageClearFull(page) \ + (((PageHeader) (page))->pd_flags &= ~PD_PAGE_FULL) + /* ---------------------------------------------------------------- * extern declarations @@ -346,12 +371,13 @@ typedef PageHeaderData *PageHeader; extern void PageInit(Page page, Size pageSize, Size specialSize); extern bool PageHeaderIsValid(PageHeader page); extern OffsetNumber PageAddItem(Page page, Item item, Size size, - OffsetNumber offsetNumber, bool overwrite); + OffsetNumber offsetNumber, bool overwrite, bool is_heap); extern Page PageGetTempPage(Page page, Size specialSize); extern void PageRestoreTempPage(Page tempPage, Page oldPage); -extern int PageRepairFragmentation(Page page, OffsetNumber *unused); +extern void PageRepairFragmentation(Page page); extern Size PageGetFreeSpace(Page page); extern Size PageGetExactFreeSpace(Page page); +extern Size PageGetHeapFreeSpace(Page page); extern void PageIndexTupleDelete(Page page, OffsetNumber offset); extern void PageIndexMultiDelete(Page page, OffsetNumber *itemnos, int nitems); |