Le 21/02/2019 à 18:28, Julien Rouhaud a écrit :
> On Thu, Feb 21, 2019 at 5:42 PM Gilles Darold <[email protected]>
> wrote:
>> Le 21/02/2019 à 12:01, Julien Rouhaud a écrit :
>>> On Thu, Feb 21, 2019 at 11:49 AM Gilles Darold <[email protected]>
>>> wrote:
>>>>> When we want to get total size of all relation in a schema we have to
>>>>> execute one of our favorite DBA query. It is quite simple but what
>>>>> about displaying schema size when using \dn+ in psql ?
>>>>> [...]
>>>>> The attached simple patch adds this feature. Is there any cons adding
>>>>> this information? The patch tries to be compatible to all PostgreSQL
>>>>> version. Let me know if I have missed something.
> I have a few comments about the patch.
>
> You're using pg_class LEFT JOIN pg_namespace while we need INNER JOIN
> here AFAICT. Also, you're using pg_relation_size(), so fsm, vm won't
> be accounted for. You should also be bypassing the size for 8.0-
> servers where there's no pg_*_size() functions.
I agree all points. Attached is a new version of the patch that use
pg_total_relation_size() and a filter on relkind IN ('r','m','S'), JOIN
fixes and no size report before 8.1.
Thanks for the review.
--
Gilles Darold
Consultant PostgreSQL
http://dalibo.com - http://dalibo.org
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index 4da6719ce7..2fed622889 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -4188,6 +4188,26 @@ listSchemas(const char *pattern, bool verbose, bool showSystem)
{
appendPQExpBufferStr(&buf, ",\n ");
printACLColumn(&buf, "n.nspacl");
+ if (pset.sversion >= 80100)
+ {
+ /* As of PostgreSQL 9.3, use LATERAL JOIN */
+ if (pset.sversion >= 93000)
+ {
+ appendPQExpBuffer(&buf, ",\n schema_size AS \"%s\"",
+ gettext_noop("Size"));
+ }
+ else
+ {
+ appendPQExpBuffer(&buf,
+ ",\n ((SELECT pg_catalog.pg_size_pretty((sum(pg_catalog.pg_total_relation_size(c.oid)))::bigint) FROM pg_catalog.pg_class c\n JOIN pg_catalog.pg_namespace s ON s.oid = c.relnamespace WHERE s.nspname = n.nspname AND c.relkind IN (%s,%s,%s))) AS \"%s\"",
+ gettext_noop("Size"),
+ CppAsString2(RELKIND_RELATION),
+ CppAsString2(RELKIND_MATVIEW),
+ CppAsString2(RELKIND_SEQUENCE)
+ );
+ }
+ }
+
appendPQExpBuffer(&buf,
",\n pg_catalog.obj_description(n.oid, 'pg_namespace') AS \"%s\"",
gettext_noop("Description"));
@@ -4195,6 +4215,16 @@ listSchemas(const char *pattern, bool verbose, bool showSystem)
appendPQExpBuffer(&buf,
"\nFROM pg_catalog.pg_namespace n\n");
+ /* As of PostgreSQL 9.3, use LATERAL JOIN */
+ if (pset.sversion >= 93000)
+ {
+ appendPQExpBuffer(&buf,
+ " JOIN LATERAL (\n SELECT pg_catalog.pg_size_pretty(sum(pg_catalog.pg_total_relation_size(c.oid))::bigint) As \"schema_size\"\n FROM pg_catalog.pg_class c\n JOIN pg_catalog.pg_namespace s ON s.oid = c.relnamespace\n WHERE s.nspname = n.nspname AND c.relkind IN (%s,%s,%s)\n ) l ON true\n",
+ CppAsString2(RELKIND_RELATION),
+ CppAsString2(RELKIND_MATVIEW),
+ CppAsString2(RELKIND_SEQUENCE)
+ );
+ }
if (!showSystem && !pattern)
appendPQExpBufferStr(&buf,
