Add the usage count statistics to the information available in
contrib/pgbuffercache. Greg Smith
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@ -40,7 +40,7 @@ Notes
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reldatabase | pg_database.oid | Database for the relation.
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reldatabase | pg_database.oid | Database for the relation.
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relblocknumber | | Offset of the page in the relation.
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relblocknumber | | Offset of the page in the relation.
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isdirty | | Is the page dirty?
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isdirty | | Is the page dirty?
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usagecount | | Page LRU count
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There is one row for each buffer in the shared cache. Unused buffers are
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There is one row for each buffer in the shared cache. Unused buffers are
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shown with all fields null except bufferid.
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shown with all fields null except bufferid.
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@ -61,19 +61,21 @@ Sample output
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regression=# \d pg_buffercache;
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regression=# \d pg_buffercache;
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View "public.pg_buffercache"
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View "public.pg_buffercache"
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Column | Type | Modifiers
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Column | Type | Modifiers
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----------------+---------+-----------
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----------------+----------+-----------
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bufferid | integer |
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bufferid | integer |
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relfilenode | oid |
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relfilenode | oid |
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reltablespace | oid |
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reltablespace | oid |
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reldatabase | oid |
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reldatabase | oid |
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relblocknumber | bigint |
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relblocknumber | bigint |
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isdirty | boolean |
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isdirty | boolean |
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usagecount | smallint |
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View definition:
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View definition:
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SELECT p.bufferid, p.relfilenode, p.reltablespace, p.reldatabase,
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SELECT p.bufferid, p.relfilenode, p.reltablespace, p.reldatabase,
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p.relblocknumber, p.isdirty
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p.relblocknumber, p.isdirty, p.usagecount
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FROM pg_buffercache_pages() p(bufferid integer, relfilenode oid,
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FROM pg_buffercache_pages() p(bufferid integer, relfilenode oid,
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reltablespace oid, reldatabase oid, relblocknumber bigint,
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reltablespace oid, reldatabase oid, relblocknumber bigint,
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isdirty boolean);
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isdirty boolean, usagecount smallint);
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regression=# SELECT c.relname, count(*) AS buffers
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regression=# SELECT c.relname, count(*) AS buffers
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FROM pg_class c INNER JOIN pg_buffercache b
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FROM pg_class c INNER JOIN pg_buffercache b
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@ -12,7 +12,7 @@ LANGUAGE C;
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CREATE VIEW pg_buffercache AS
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CREATE VIEW pg_buffercache AS
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SELECT P.* FROM pg_buffercache_pages() AS P
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SELECT P.* FROM pg_buffercache_pages() AS P
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(bufferid integer, relfilenode oid, reltablespace oid, reldatabase oid,
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(bufferid integer, relfilenode oid, reltablespace oid, reldatabase oid,
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relblocknumber int8, isdirty bool);
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relblocknumber int8, isdirty bool, usagecount int2);
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-- Don't want these to be available at public.
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-- Don't want these to be available at public.
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REVOKE ALL ON FUNCTION pg_buffercache_pages() FROM PUBLIC;
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REVOKE ALL ON FUNCTION pg_buffercache_pages() FROM PUBLIC;
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@ -3,7 +3,7 @@
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* pg_buffercache_pages.c
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* pg_buffercache_pages.c
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* display some contents of the buffer cache
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* display some contents of the buffer cache
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*
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*
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* $PostgreSQL: pgsql/contrib/pg_buffercache/pg_buffercache_pages.c,v 1.11 2006/10/22 17:49:21 tgl Exp $
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* $PostgreSQL: pgsql/contrib/pg_buffercache/pg_buffercache_pages.c,v 1.12 2007/04/07 16:09:14 momjian Exp $
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*-------------------------------------------------------------------------
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*-------------------------------------------------------------------------
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*/
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*/
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#include "postgres.h"
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#include "postgres.h"
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@ -16,7 +16,7 @@
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#include "utils/relcache.h"
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#include "utils/relcache.h"
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#define NUM_BUFFERCACHE_PAGES_ELEM 6
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#define NUM_BUFFERCACHE_PAGES_ELEM 7
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PG_MODULE_MAGIC;
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PG_MODULE_MAGIC;
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@ -35,6 +35,7 @@ typedef struct
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BlockNumber blocknum;
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BlockNumber blocknum;
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bool isvalid;
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bool isvalid;
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bool isdirty;
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bool isdirty;
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uint16 usagecount;
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} BufferCachePagesRec;
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} BufferCachePagesRec;
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@ -91,6 +92,8 @@ pg_buffercache_pages(PG_FUNCTION_ARGS)
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INT8OID, -1, 0);
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INT8OID, -1, 0);
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TupleDescInitEntry(tupledesc, (AttrNumber) 6, "isdirty",
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TupleDescInitEntry(tupledesc, (AttrNumber) 6, "isdirty",
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BOOLOID, -1, 0);
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BOOLOID, -1, 0);
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TupleDescInitEntry(tupledesc, (AttrNumber) 7, "usage_count",
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INT2OID, -1, 0);
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fctx->tupdesc = BlessTupleDesc(tupledesc);
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fctx->tupdesc = BlessTupleDesc(tupledesc);
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@ -126,6 +129,7 @@ pg_buffercache_pages(PG_FUNCTION_ARGS)
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fctx->record[i].reltablespace = bufHdr->tag.rnode.spcNode;
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fctx->record[i].reltablespace = bufHdr->tag.rnode.spcNode;
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fctx->record[i].reldatabase = bufHdr->tag.rnode.dbNode;
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fctx->record[i].reldatabase = bufHdr->tag.rnode.dbNode;
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fctx->record[i].blocknum = bufHdr->tag.blockNum;
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fctx->record[i].blocknum = bufHdr->tag.blockNum;
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fctx->record[i].usagecount = bufHdr->usage_count;
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if (bufHdr->flags & BM_DIRTY)
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if (bufHdr->flags & BM_DIRTY)
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fctx->record[i].isdirty = true;
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fctx->record[i].isdirty = true;
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@ -172,6 +176,7 @@ pg_buffercache_pages(PG_FUNCTION_ARGS)
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nulls[3] = true;
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nulls[3] = true;
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nulls[4] = true;
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nulls[4] = true;
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nulls[5] = true;
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nulls[5] = true;
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nulls[6] = true;
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}
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}
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else
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else
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{
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{
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@ -185,6 +190,8 @@ pg_buffercache_pages(PG_FUNCTION_ARGS)
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nulls[4] = false;
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nulls[4] = false;
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values[5] = BoolGetDatum(fctx->record[i].isdirty);
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values[5] = BoolGetDatum(fctx->record[i].isdirty);
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nulls[5] = false;
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nulls[5] = false;
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values[6] = Int16GetDatum(fctx->record[i].usagecount);
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nulls[6] = false;
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}
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}
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/* Build and return the tuple. */
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/* Build and return the tuple. */
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