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doc: add namespace column to pg_buffercache example query

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Without the namespace, the table name could be ambiguous.

Reported-by: adunham@arbormetrix.com

Discussion: https://postgr.es/m/158155175140.23798.2189464781144503491@wrigleys.postgresql.org

Backpatch-through: 9.5
This commit is contained in:
Bruce Momjian 2020-03-31 17:16:33 -04:00
parent 51a1c77bd7
commit d684700136
1 changed files with 16 additions and 15 deletions
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31
doc/src/sgml/pgbuffercache.sgml
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@ -148,27 +148,28 @@
<title>Sample Output</title>
<screen>
regression=# SELECT c.relname, count(*) AS buffers
regression=# SELECT n.nspname, c.relname, count(*) AS buffers
FROM pg_buffercache b INNER JOIN pg_class c
ON b.relfilenode = pg_relation_filenode(c.oid) AND
b.reldatabase IN (0, (SELECT oid FROM pg_database
WHERE datname = current_database()))
GROUP BY c.relname
ORDER BY 2 DESC
JOIN pg_namespace n ON n.oid = c.relnamespace
GROUP BY n.nspname, c.relname
ORDER BY 3 DESC
LIMIT 10;
relname | buffers
---------------------------------+---------
tenk2 | 345
tenk1 | 141
pg_proc | 46
pg_class | 45
pg_attribute | 43
pg_class_relname_nsp_index | 30
pg_proc_proname_args_nsp_index | 28
pg_attribute_relid_attnam_index | 26
pg_depend | 22
pg_depend_reference_index | 20
nspname | relname | buffers
------------+------------------------+---------
public | delete_test_table | 593
public | delete_test_table_pkey | 494
pg_catalog | pg_attribute | 472
public | quad_poly_tbl | 353
public | tenk2 | 349
public | tenk1 | 349
public | gin_test_idx | 306
pg_catalog | pg_largeobject | 206
public | gin_test_tbl | 188
public | spgist_text_tbl | 182
(10 rows)
</screen>
</sect2>