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Code review for recent dbsize changes. Fix some thinkos, enforce coding

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style and message style standards, improve documentation.
REL8_0_STABLE
Tom Lane 22 years ago
parent 70c8fcb287
commit d9b68c8061
3 changed files with 99 additions and 95 deletions
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  1. 53
      contrib/dbsize/README.dbsize
  2. 129
      contrib/dbsize/dbsize.c
  3. 12
      contrib/dbsize/dbsize.sql.in

53
contrib/dbsize/README.dbsize
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@ -5,8 +5,8 @@ database object:
int8 relation_size(text)
int8 pg_database_size(oid)
int8 pg_tablespace_size(oid)
int8 pg_relation_size(oid)
int8 pg_tablespace_size(oid)
text pg_size_pretty(int8)
@ -15,40 +15,37 @@ The first two functions:
SELECT database_size('template1');
SELECT relation_size('pg_class');
take the name of the object, and support databases and tables. Please
note that relation_size() only reports table file usage and not the
space used by indexes and toast tables.
Functions using oids are:
take the name of the object (possibly schema-qualified, for relation_size),
while these functions take object OIDs:
SELECT pg_database_size(1); -- template1 database
SELECT pg_tablespace_size(1663); -- pg_default tablespace
SELECT pg_relation_size(1259); -- pg_class table size
SELECT pg_tablespace_size(1663); -- pg_default tablespace
pg_relation_size() will report the size of the table, index and toast
table OIDs, but they must be requested individually. To obtain the total
size of a table including all helper files you'd have to do something
like:
XXX This query does not work, syntax error XXX
SELECT pg_relation_size(cl.oid) AS tablesize,
CASE WHEN reltoastrelid=0 THEN 0
ELSE pg_relation_size(reltoastrelid) END AS toastsize,
SUM(pg_relation_size(indexrelid)) AS indexsize,
pg_size_pretty(pg_relation_size(cl.oid)
+ pg_relation_size(reltoastrelid)
+ SUM(pg_relation_size(indexrelid))::int8)
AS totalsize
FROM pg_class cl
JOIN pg_index ON cl.oid=indrelid
WHERE relname = 'pg_rewrite'
GROUP BY 1,2
Please note that relation_size and pg_relation_size report only the size of
the selected relation itself; any subsidiary indexes or toast tables are not
counted. To obtain the total size of a table including all helper files
you'd have to do something like:
SELECT *,
pg_size_pretty(tablesize+indexsize+toastsize+toastindexsize) AS totalsize
FROM
(SELECT pg_relation_size(cl.oid) AS tablesize,
COALESCE((SELECT SUM(pg_relation_size(indexrelid))::bigint
FROM pg_index WHERE cl.oid=indrelid), 0) AS indexsize,
CASE WHEN reltoastrelid=0 THEN 0
ELSE pg_relation_size(reltoastrelid)
END AS toastsize,
CASE WHEN reltoastrelid=0 THEN 0
ELSE pg_relation_size((SELECT reltoastidxid FROM pg_class ct
WHERE ct.oid = cl.reltoastrelid))
END AS toastindexsize
FROM pg_class cl
WHERE relname = 'foo') ss;
This sample query utilizes the helper function pg_size_pretty(int8),
which formats the number of bytes into a convenient string using KB, MB,
GB. It is also contained in this module.
To install, just run make; make install. Finally, load the functions
To install, just run make; make install. Then load the functions
into any database using dbsize.sql.

129
contrib/dbsize/dbsize.c
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@ -2,29 +2,29 @@
* dbsize.c
* object size functions
*
* Copyright (c) 2004, PostgreSQL Global Development Group
* Copyright (c) 2002-2004, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/contrib/dbsize/dbsize.c,v 1.14 2004/09/02 04:04:04 momjian Exp $
* $PostgreSQL: pgsql/contrib/dbsize/dbsize.c,v 1.15 2004/09/28 19:35:43 tgl Exp $
*
*/
#include "postgres.h"
#include <sys/types.h>
#include <sys/stat.h>
#include "access/heapam.h"
#include "storage/fd.h"
#include "utils/syscache.h"
#include "utils/builtins.h"
#include "catalog/namespace.h"
#include "catalog/pg_tablespace.h"
#include "commands/dbcommands.h"
#include "miscadmin.h"
#include "storage/fd.h"
#include "utils/builtins.h"
#include "utils/syscache.h"
/* hack to make it compile under Win32 */
extern DLLIMPORT char *DataDir;
Datum pg_tablespace_size(PG_FUNCTION_ARGS);
@ -44,25 +44,26 @@ PG_FUNCTION_INFO_V1(database_size);
PG_FUNCTION_INFO_V1(relation_size);
/* Return physical size of directory contents, or 0 if dir doesn't exist */
static int64
db_dir_size(char *path)
db_dir_size(const char *path)
{
int64 dirsize=0;
int64 dirsize = 0;
struct dirent *direntry;
DIR *dirdesc;
char filename[MAXPGPATH];
dirdesc=AllocateDir(path);
dirdesc = AllocateDir(path);
if (!dirdesc)
return 0;
while ((direntry = readdir(dirdesc)) != 0)
while ((direntry = readdir(dirdesc)) != NULL)
{
struct stat fst;
if (!strcmp(direntry->d_name, ".") || !strcmp(direntry->d_name, ".."))
if (strcmp(direntry->d_name, ".") == 0 ||
strcmp(direntry->d_name, "..") == 0)
continue;
snprintf(filename, MAXPGPATH, "%s/%s", path, direntry->d_name);
@ -82,39 +83,44 @@ db_dir_size(char *path)
static int64
calculate_database_size(Oid dbOid)
{
int64 totalsize=0;
int64 totalsize = 0;
DIR *dirdesc;
struct dirent *direntry;
char pathname[MAXPGPATH];
snprintf(pathname, MAXPGPATH, "%s/global/%u", DataDir, (unsigned)dbOid);
totalsize += db_dir_size(pathname);
snprintf(pathname, MAXPGPATH, "%s/base/%u", DataDir, (unsigned)dbOid);
/* Shared storage in pg_global is not counted */
/* Include pg_default storage */
snprintf(pathname, MAXPGPATH, "%s/base/%u", DataDir, dbOid);
totalsize += db_dir_size(pathname);
/* Scan the non-default tablespaces */
snprintf(pathname, MAXPGPATH, "%s/pg_tblspc", DataDir);
dirdesc = AllocateDir(pathname);
if (!dirdesc)
ereport(ERROR,
(errcode_for_file_access(),
errmsg("could not open tablespace directory: %m")));
errmsg("could not open tablespace directory \"%s\": %m",
pathname)));
while ((direntry = readdir(dirdesc)) != 0)
while ((direntry = readdir(dirdesc)) != NULL)
{
if (!strcmp(direntry->d_name, ".") || !strcmp(direntry->d_name, ".."))
if (strcmp(direntry->d_name, ".") == 0 ||
strcmp(direntry->d_name, "..") == 0)
continue;
snprintf(pathname, MAXPGPATH, "%s/pg_tblspc/%s/%u", DataDir, direntry->d_name, (unsigned)dbOid);
snprintf(pathname, MAXPGPATH, "%s/pg_tblspc/%s/%u",
DataDir, direntry->d_name, dbOid);
totalsize += db_dir_size(pathname);
}
FreeDir(dirdesc);
/* Complain if we found no trace of the DB at all */
if (!totalsize)
ereport(ERROR,
(ERRCODE_UNDEFINED_DATABASE,
errmsg("Database OID %u unknown.", (unsigned)dbOid)));
errmsg("database with OID %u does not exist", dbOid)));
return totalsize;
}
@ -126,7 +132,6 @@ Datum
pg_tablespace_size(PG_FUNCTION_ARGS)
{
Oid tblspcOid = PG_GETARG_OID(0);
char tblspcPath[MAXPGPATH];
char pathname[MAXPGPATH];
int64 totalsize=0;
@ -138,23 +143,26 @@ pg_tablespace_size(PG_FUNCTION_ARGS)
else if (tblspcOid == GLOBALTABLESPACE_OID)
snprintf(tblspcPath, MAXPGPATH, "%s/global", DataDir);
else
snprintf(tblspcPath, MAXPGPATH, "%s/pg_tblspc/%u", DataDir, (unsigned)tblspcOid);
snprintf(tblspcPath, MAXPGPATH, "%s/pg_tblspc/%u", DataDir, tblspcOid);
dirdesc = AllocateDir(tblspcPath);
if (!dirdesc)
ereport(ERROR,
(errcode_for_file_access(),
errmsg("No such tablespace OID: %u: %m", (unsigned)tblspcOid)));
errmsg("could not open tablespace directory \"%s\": %m",
tblspcPath)));
while ((direntry = readdir(dirdesc)) != 0)
while ((direntry = readdir(dirdesc)) != NULL)
{
struct stat fst;
if (!strcmp(direntry->d_name, ".") || !strcmp(direntry->d_name, ".."))
if (strcmp(direntry->d_name, ".") == 0 ||
strcmp(direntry->d_name, "..") == 0)
continue;
snprintf(pathname, MAXPGPATH, "%s/%s", tblspcPath, direntry->d_name);
if (stat(pathname, &fst) < 0)
ereport(ERROR,
(errcode_for_file_access(),
@ -172,7 +180,7 @@ pg_tablespace_size(PG_FUNCTION_ARGS)
/*
* calculate size of databases in all tablespaces
* calculate size of database in all tablespaces
*/
Datum
pg_database_size(PG_FUNCTION_ARGS)
@ -182,7 +190,6 @@ pg_database_size(PG_FUNCTION_ARGS)
PG_RETURN_INT64(calculate_database_size(dbOid));
}
Datum
database_size(PG_FUNCTION_ARGS)
{
@ -192,11 +199,14 @@ database_size(PG_FUNCTION_ARGS)
if (!OidIsValid(dbOid))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_DATABASE),
errmsg("database \"%s\" does not exist", NameStr(*dbName))));
errmsg("database \"%s\" does not exist",
NameStr(*dbName))));
PG_RETURN_INT64(calculate_database_size(dbOid));
}
/* Calculate relation size given tablespace and relation OIDs */
static int64
calculate_relation_size(Oid tblspcOid, Oid relnodeOid)
{
@ -205,21 +215,27 @@ calculate_relation_size(Oid tblspcOid, Oid relnodeOid)
char dirpath[MAXPGPATH];
char pathname[MAXPGPATH];
if (tblspcOid == 0 || tblspcOid == DEFAULTTABLESPACE_OID)
snprintf(dirpath, MAXPGPATH, "%s/base/%u", DataDir, (unsigned)MyDatabaseId);
if (!tblspcOid)
tblspcOid = MyDatabaseTableSpace;
if (tblspcOid == DEFAULTTABLESPACE_OID)
snprintf(dirpath, MAXPGPATH, "%s/base/%u", DataDir, MyDatabaseId);
else if (tblspcOid == GLOBALTABLESPACE_OID)
snprintf(dirpath, MAXPGPATH, "%s/global", DataDir);
else
snprintf(dirpath, MAXPGPATH, "%s/pg_tblspc/%u/%u", DataDir, (unsigned)tblspcOid, (unsigned)MyDatabaseId);
snprintf(dirpath, MAXPGPATH, "%s/pg_tblspc/%u/%u",
DataDir, tblspcOid, MyDatabaseId);
for (segcount = 0 ;; segcount++)
{
struct stat fst;
if (segcount == 0)
snprintf(pathname, MAXPGPATH, "%s/%u", dirpath, (unsigned) relnodeOid);
snprintf(pathname, MAXPGPATH, "%s/%u",
dirpath, relnodeOid);
else
snprintf(pathname, MAXPGPATH, "%s/%u.%u", dirpath, (unsigned) relnodeOid, segcount);
snprintf(pathname, MAXPGPATH, "%s/%u.%u",
dirpath, relnodeOid, segcount);
if (stat(pathname, &fst) < 0)
{
@ -243,47 +259,32 @@ Datum
pg_relation_size(PG_FUNCTION_ARGS)
{
Oid relOid=PG_GETARG_OID(0);
HeapTuple tuple;
Form_pg_class pg_class;
Oid relnodeOid;
Oid tblspcOid;
char relkind;
tuple = SearchSysCache(RELOID, ObjectIdGetDatum(relOid), 0, 0, 0);
tuple = SearchSysCache(RELOID,
ObjectIdGetDatum(relOid),
0, 0, 0);
if (!HeapTupleIsValid(tuple))
ereport(ERROR,
(ERRCODE_UNDEFINED_TABLE,
errmsg("Relation OID %u does not exist", relOid)));
errmsg("relation with OID %u does not exist", relOid)));
pg_class = (Form_pg_class) GETSTRUCT(tuple);
relnodeOid = pg_class->relfilenode;
tblspcOid = pg_class->reltablespace;
relkind = pg_class->relkind;
ReleaseSysCache(tuple);
switch(relkind)
{
case RELKIND_INDEX:
case RELKIND_RELATION:
case RELKIND_TOASTVALUE:
break;
default:
ereport(ERROR,
(ERRCODE_WRONG_OBJECT_TYPE,
errmsg("Relation kind %d not supported", relkind)));
}
PG_RETURN_INT64(calculate_relation_size(tblspcOid, relnodeOid));
}
Datum
relation_size(PG_FUNCTION_ARGS)
{
text *relname = PG_GETARG_TEXT_P(0);
RangeVar *relrv;
Relation relation;
Oid relnodeOid;
@ -291,12 +292,12 @@ relation_size(PG_FUNCTION_ARGS)
relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname,
"relation_size"));
relation = heap_openrv(relrv, AccessShareLock);
relation = relation_openrv(relrv, AccessShareLock);
tblspcOid = relation->rd_rel->reltablespace;
relnodeOid = relation->rd_rel->relfilenode;
heap_close(relation, AccessShareLock);
relation_close(relation, AccessShareLock);
PG_RETURN_INT64(calculate_relation_size(tblspcOid, relnodeOid));
}
@ -313,30 +314,36 @@ pg_size_pretty(PG_FUNCTION_ARGS)
int64 mult=1;
if (size < limit*mult)
snprintf(VARDATA(result), 50, INT64_FORMAT" bytes", size);
snprintf(VARDATA(result), 50, INT64_FORMAT" bytes",
size);
else
{
mult *= 1024;
if (size < limit*mult)
snprintf(VARDATA(result), 50, INT64_FORMAT " kB", (size+mult/2) / mult);
snprintf(VARDATA(result), 50, INT64_FORMAT " kB",
(size+mult/2) / mult);
else
{
mult *= 1024;
if (size < limit*mult)
snprintf(VARDATA(result), 50, INT64_FORMAT " MB", (size+mult/2) / mult);
snprintf(VARDATA(result), 50, INT64_FORMAT " MB",
(size+mult/2) / mult);
else
{
mult *= 1024;
if (size < limit*mult)
snprintf(VARDATA(result), 50, INT64_FORMAT " GB", (size+mult/2) / mult);
snprintf(VARDATA(result), 50, INT64_FORMAT " GB",
(size+mult/2) / mult);
else
{
mult *= 1024;
snprintf(VARDATA(result), 50, INT64_FORMAT " TB", (size+mult/2) / mult);
snprintf(VARDATA(result), 50, INT64_FORMAT " TB",
(size+mult/2) / mult);
}
}
}
}
VARATT_SIZEP(result) = strlen(VARDATA(result)) + VARHDRSZ;
PG_RETURN_TEXT_P(result);

12
contrib/dbsize/dbsize.sql.in
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@ -1,23 +1,23 @@
CREATE FUNCTION database_size (name) RETURNS bigint
AS 'MODULE_PATHNAME', 'database_size'
LANGUAGE C WITH (isstrict);
LANGUAGE C STRICT;
CREATE FUNCTION relation_size (text) RETURNS bigint
AS 'MODULE_PATHNAME', 'relation_size'
LANGUAGE C WITH (isstrict);
LANGUAGE C STRICT;
CREATE FUNCTION pg_tablespace_size(oid) RETURNS bigint
AS 'MODULE_PATHNAME', 'pg_tablespace_size'
LANGUAGE C STABLE STRICT;
LANGUAGE C STRICT;
CREATE FUNCTION pg_database_size(oid) RETURNS bigint
AS 'MODULE_PATHNAME', 'pg_database_size'
LANGUAGE C STABLE STRICT;
LANGUAGE C STRICT;
CREATE FUNCTION pg_relation_size(oid) RETURNS bigint
AS 'MODULE_PATHNAME', 'pg_relation_size'
LANGUAGE C STABLE STRICT;
LANGUAGE C STRICT;
CREATE FUNCTION pg_size_pretty(bigint) RETURNS text
AS 'MODULE_PATHNAME', 'pg_size_pretty'
LANGUAGE C STABLE STRICT;
LANGUAGE C STRICT;

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