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vacuumdb: Skip temporary tables in query to build list of relations

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Running vacuumdb with a non-superuser while another user has created a
temporary table would lead to a mid-flight permission failure,
interrupting the operation.  vacuum_rel() skips temporary relations of
other backends, and it makes no sense for vacuumdb to know about these
relations, so let's switch it to ignore temporary relations entirely.

Adding a qual in the query based on relpersistence simplifies the
generation of its WHERE clause in vacuum_one_database(), per se the
removal of "has_where".

Author: VaibhaveS, Michael Paquier
Reviewed-by: Fujii Masao
Discussion: https://postgr.es/m/CAM_eQjwfAR=y3G1fGyS1U9FTmc+FyJm9amNfY2QCZBnDDbNPZg@mail.gmail.com
Backpatch-through: 12
This commit is contained in:
Michael Paquier 2024-09-25 14:44:56 +09:00
parent 0cf3d41cbb
commit 74eaa0544a
1 changed files with 16 additions and 10 deletions
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26
src/bin/scripts/vacuumdb.c
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@ -401,7 +401,6 @@ vacuum_one_database(ConnParams *cparams,
int ntups; int ntups;
bool failed = false; bool failed = false;
bool tables_listed = false; bool tables_listed = false;
bool has_where = false;
const char *initcmd; const char *initcmd;
const char *stage_commands[] = { const char *stage_commands[] = {
"SET default_statistics_target=1; SET vacuum_cost_delay=0;", "SET default_statistics_target=1; SET vacuum_cost_delay=0;",
@ -551,11 +550,21 @@ vacuum_one_database(ConnParams *cparams,
" LEFT JOIN pg_catalog.pg_class t" " LEFT JOIN pg_catalog.pg_class t"
" ON c.reltoastrelid OPERATOR(pg_catalog.=) t.oid\n"); " ON c.reltoastrelid OPERATOR(pg_catalog.=) t.oid\n");
/* Used to match the tables listed by the user */ /*
* Used to match the tables listed by the user, completing the JOIN
* clause.
*/
if (tables_listed) if (tables_listed)
appendPQExpBufferStr(&catalog_query, " JOIN listed_tables" appendPQExpBufferStr(&catalog_query, " JOIN listed_tables"
" ON listed_tables.table_oid OPERATOR(pg_catalog.=) c.oid\n"); " ON listed_tables.table_oid OPERATOR(pg_catalog.=) c.oid\n");
/*
* Exclude temporary tables, beginning the WHERE clause.
*/
appendPQExpBufferStr(&catalog_query,
" WHERE c.relpersistence != " CppAsString2(RELPERSISTENCE_TEMP));
/* /*
* If no tables were listed, filter for the relevant relation types. If * If no tables were listed, filter for the relevant relation types. If
* tables were given via --table, don't bother filtering by relation type. * tables were given via --table, don't bother filtering by relation type.
@ -564,10 +573,9 @@ vacuum_one_database(ConnParams *cparams,
*/ */
if (!tables_listed) if (!tables_listed)
{ {
appendPQExpBufferStr(&catalog_query, " WHERE c.relkind OPERATOR(pg_catalog.=) ANY (array[" appendPQExpBufferStr(&catalog_query, " AND c.relkind OPERATOR(pg_catalog.=) ANY (array["
CppAsString2(RELKIND_RELATION) ", " CppAsString2(RELKIND_RELATION) ", "
CppAsString2(RELKIND_MATVIEW) "])\n"); CppAsString2(RELKIND_MATVIEW) "])\n");
has_where = true;
} }
/* /*
@ -580,25 +588,23 @@ vacuum_one_database(ConnParams *cparams,
if (vacopts->min_xid_age != 0) if (vacopts->min_xid_age != 0)
{ {
appendPQExpBuffer(&catalog_query, appendPQExpBuffer(&catalog_query,
" %s GREATEST(pg_catalog.age(c.relfrozenxid)," " AND GREATEST(pg_catalog.age(c.relfrozenxid),"
" pg_catalog.age(t.relfrozenxid)) " " pg_catalog.age(t.relfrozenxid)) "
" OPERATOR(pg_catalog.>=) '%d'::pg_catalog.int4\n" " OPERATOR(pg_catalog.>=) '%d'::pg_catalog.int4\n"
" AND c.relfrozenxid OPERATOR(pg_catalog.!=)" " AND c.relfrozenxid OPERATOR(pg_catalog.!=)"
" '0'::pg_catalog.xid\n", " '0'::pg_catalog.xid\n",
has_where ? "AND" : "WHERE", vacopts->min_xid_age); vacopts->min_xid_age);
has_where = true;
} }
if (vacopts->min_mxid_age != 0) if (vacopts->min_mxid_age != 0)
{ {
appendPQExpBuffer(&catalog_query, appendPQExpBuffer(&catalog_query,
" %s GREATEST(pg_catalog.mxid_age(c.relminmxid)," " AND GREATEST(pg_catalog.mxid_age(c.relminmxid),"
" pg_catalog.mxid_age(t.relminmxid)) OPERATOR(pg_catalog.>=)" " pg_catalog.mxid_age(t.relminmxid)) OPERATOR(pg_catalog.>=)"
" '%d'::pg_catalog.int4\n" " '%d'::pg_catalog.int4\n"
" AND c.relminmxid OPERATOR(pg_catalog.!=)" " AND c.relminmxid OPERATOR(pg_catalog.!=)"
" '0'::pg_catalog.xid\n", " '0'::pg_catalog.xid\n",
has_where ? "AND" : "WHERE", vacopts->min_mxid_age); vacopts->min_mxid_age);
has_where = true;
} }
/* /*