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Add an EXPLAIN (BUFFERS) option to show buffer-usage statistics.

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This patch also removes buffer-usage statistics from the track_counts
output, since this (or the global server statistics) is deemed to be a better
interface to this information.

Itagaki Takahiro, reviewed by Euler Taveira de Oliveira.
This commit is contained in:
Robert Haas
2009-12-15 04:57:48 +00:00
parent 6f1bf75d50
commit cddca5ec13
25 changed files with 274 additions and 140 deletions
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12
src/backend/storage/buffer/buf_init.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/buffer/buf_init.c,v 1.82 2009/01/01 17:23:47 momjian Exp $
* $PostgreSQL: pgsql/src/backend/storage/buffer/buf_init.c,v 1.83 2009/12/15 04:57:47 rhaas Exp $
*
*-------------------------------------------------------------------------
*/
@@ -22,16 +22,6 @@ BufferDesc *BufferDescriptors;
char *BufferBlocks;
int32 *PrivateRefCount;
/* statistics counters */
long int ReadBufferCount;
long int ReadLocalBufferCount;
long int BufferHitCount;
long int LocalBufferHitCount;
long int BufferFlushCount;
long int LocalBufferFlushCount;
long int BufFileReadCount;
long int BufFileWriteCount;
/*
* Data Structures: