brin.h File Reference

#include "nodes/execnodes.h"
#include "utils/relcache.h"

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Data Structures
struct	BrinOptions
struct	BrinStatsData

Macros
#define	BRIN_DEFAULT_PAGES_PER_RANGE   128
#define	BrinGetPagesPerRange(relation)
#define	BrinGetAutoSummarize(relation)

Typedefs
typedef struct BrinOptions	BrinOptions
typedef struct BrinStatsData	BrinStatsData

Functions
void	brinGetStats (Relation index, BrinStatsData *stats)

Macro Definition Documentation

BRIN_DEFAULT_PAGES_PER_RANGE

#define BRIN_DEFAULT_PAGES_PER_RANGE   128

Definition at line 38 of file brin.h.

BrinGetAutoSummarize

#define BrinGetAutoSummarize

(

relation

)

Value:

    (AssertMacro(relation->rd_rel->relkind == RELKIND_INDEX && \
                 relation->rd_rel->relam == BRIN_AM_OID), \
     (relation)->rd_options ? \
     ((BrinOptions *) (relation)->rd_options)->autosummarize : \
      false)

Definition at line 45 of file brin.h.

BrinGetPagesPerRange

#define BrinGetPagesPerRange

(

relation

)

Value:

    (AssertMacro(relation->rd_rel->relkind == RELKIND_INDEX && \
                 relation->rd_rel->relam == BRIN_AM_OID), \
     (relation)->rd_options ? \
     ((BrinOptions *) (relation)->rd_options)->pagesPerRange : \
      BRIN_DEFAULT_PAGES_PER_RANGE)

Definition at line 39 of file brin.h.

Typedef Documentation

BrinOptions

typedef struct BrinOptions BrinOptions

BrinStatsData

typedef struct BrinStatsData BrinStatsData

Function Documentation

brinGetStats()

void brinGetStats	(	Relation	index,
		BrinStatsData *	stats
	)

Definition at line 1254 of file brin.c.

{
    Buffer      metabuffer;
    Page        metapage;
    BrinMetaPageData *metadata;
 
    metabuffer = ReadBuffer(index, BRIN_METAPAGE_BLKNO);
    LockBuffer(metabuffer, BUFFER_LOCK_SHARE);
    metapage = BufferGetPage(metabuffer);
    metadata = (BrinMetaPageData *) PageGetContents(metapage);
 
    stats->pagesPerRange = metadata->pagesPerRange;
    stats->revmapNumPages = metadata->lastRevmapPage - 1;
 
    UnlockReleaseBuffer(metabuffer);
}

References BRIN_METAPAGE_BLKNO, BUFFER_LOCK_SHARE, BufferGetPage, BrinMetaPageData::lastRevmapPage, LockBuffer(), PageGetContents, BrinStatsData::pagesPerRange, BrinMetaPageData::pagesPerRange, ReadBuffer(), BrinStatsData::revmapNumPages, and UnlockReleaseBuffer().

Referenced by brincostestimate().