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Add --min-xid-age and --min-mxid-age options to vacuumdb 

These two new options can be used to improve the selectivity of
relations to vacuum or analyze even further depending on the age of
respectively their transaction ID or multixact ID, so as it is possible
to prioritize tables to prevent wraparound of one or the other.
Combined with --table, it is possible to target a subset of tables to
choose as potential processing targets.

Author: Nathan Bossart
Reviewed-by: Michael Paquier, Masahiko Sawada
Discussion: https://postgr.es/m/FFE5373C-E26A-495B-B5C8-911EC4A41C5E@amazon.com
This commit is contained in:
Michael Paquier 2019-01-31 13:06:51 +09:00
parent 5f5c014590
commit 00d1e88d36
3 changed files with 148 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
doc/src/sgml/ref/vacuumdb.sgml
View File

@ -172,6 +172,60 @@ PostgreSQL documentation
</listitem>
</varlistentry>
<varlistentry>
<term><option>--min-mxid-age <replaceable class="parameter">mxid_age</replaceable></option></term>
<listitem>
<para>
Only execute the vacuum or analyze commands on tables with a multixact
ID age of at least <replaceable class="parameter">mxid_age</replaceable>.
This setting is useful for prioritizing tables to process to prevent
multixact ID wraparound (see
<xref linkend="vacuum-for-multixact-wraparound"/>).
</para>
<para>
For the purposes of this option, the multixact ID age of a relation is
the greatest of the ages of the main relation and its associated
<acronym>TOAST</acronym> table, if one exists. Since the commands
issued by <application>vacuumdb</application> will also process the
<acronym>TOAST</acronym> table for the relation if necessary, it does
not need to be considered separately.
</para>
<note>
<para>
This option is only available for servers running
<productname>PostgreSQL</productname> 9.6 and later.
</para>
</note>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--min-xid-age <replaceable class="parameter">xid_age</replaceable></option></term>
<listitem>
<para>
Only execute the vacuum or analyze commands on tables with a
transaction ID age of at least
<replaceable class="parameter">xid_age</replaceable>. This setting
is useful for prioritizing tables to process to prevent transaction
ID wraparound (see <xref linkend="vacuum-for-wraparound"/>).
</para>
<para>
For the purposes of this option, the transaction ID age of a relation
is the greatest of the ages of the main relation and its associated
<acronym>TOAST</acronym> table, if one exists. Since the commands
issued by <application>vacuumdb</application> will also process the
<acronym>TOAST</acronym> table for the relation if necessary, it does
not need to be considered separately.
</para>
<note>
<para>
This option is only available for servers running
<productname>PostgreSQL</productname> 9.6 and later.
</para>
</note>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-q</option></term>
<term><option>--quiet</option></term>

19
src/bin/scripts/t/100_vacuumdb.pl
View File

@ -3,7 +3,7 @@ use warnings;
use PostgresNode;
use TestLib;
use Test::More tests => 38;
use Test::More tests => 44;
program_help_ok('vacuumdb');
program_version_ok('vacuumdb');
@ -95,3 +95,20 @@ $node->command_checks_all(
[qr/^.*vacuuming database "postgres"/],
[qr/^WARNING.*cannot vacuum non-tables or special system tables/s],
'vacuumdb with view');
$node->command_fails(
[ 'vacuumdb', '--table', 'vactable', '--min-mxid-age', '0',
'postgres'],
'vacuumdb --min-mxid-age with incorrect value');
$node->command_fails(
[ 'vacuumdb', '--table', 'vactable', '--min-xid-age', '0',
'postgres'],
'vacuumdb --min-xid-age with incorrect value');
$node->issues_sql_like(
[ 'vacuumdb', '--table', 'vactable', '--min-mxid-age', '2147483000',
'postgres'],
qr/GREATEST.*relminmxid.*2147483000/,
'vacuumdb --table --min-mxid-age');
$node->issues_sql_like(
[ 'vacuumdb', '--min-xid-age', '2147483001', 'postgres' ],
qr/GREATEST.*relfrozenxid.*2147483001/,
'vacuumdb --table --min-xid-age');

77
src/bin/scripts/vacuumdb.c
View File

@ -43,6 +43,8 @@ typedef struct vacuumingOptions
bool freeze;
bool disable_page_skipping;
bool skip_locked;
int min_xid_age;
int min_mxid_age;
} vacuumingOptions;
@ -113,6 +115,8 @@ main(int argc, char *argv[])
{"analyze-in-stages", no_argument, NULL, 3},
{"disable-page-skipping", no_argument, NULL, 4},
{"skip-locked", no_argument, NULL, 5},
{"min-xid-age", required_argument, NULL, 6},
{"min-mxid-age", required_argument, NULL, 7},
{NULL, 0, NULL, 0}
};
@ -222,6 +226,24 @@ main(int argc, char *argv[])
case 5:
vacopts.skip_locked = true;
break;
case 6:
vacopts.min_xid_age = atoi(optarg);
if (vacopts.min_xid_age <= 0)
{
fprintf(stderr, _("%s: minimum transaction ID age must be at least 1\n"),
progname);
exit(1);
}
break;
case 7:
vacopts.min_mxid_age = atoi(optarg);
if (vacopts.min_mxid_age <= 0)
{
fprintf(stderr, _("%s: minimum multixact ID age must be at least 1\n"),
progname);
exit(1);
}
break;
default:
fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
exit(1);
@ -370,6 +392,7 @@ vacuum_one_database(const char *dbname, vacuumingOptions *vacopts,
bool failed = false;
bool parallel = concurrentCons > 1;
bool tables_listed = false;
bool has_where = false;
const char *stage_commands[] = {
"SET default_statistics_target=1; SET vacuum_cost_delay=0;",
"SET default_statistics_target=10; RESET vacuum_cost_delay;",
@ -403,6 +426,20 @@ vacuum_one_database(const char *dbname, vacuumingOptions *vacopts,
exit(1);
}
if (vacopts->min_xid_age != 0 && PQserverVersion(conn) < 90600)
{
fprintf(stderr, _("%s: cannot use the \"%s\" option on server versions older than PostgreSQL 9.6\n"),
progname, "--min-xid-age");
exit(1);
}
if (vacopts->min_mxid_age != 0 && PQserverVersion(conn) < 90600)
{
fprintf(stderr, _("%s: cannot use the \"%s\" option on server versions older than PostgreSQL 9.6\n"),
progname, "--min-mxid-age");
exit(1);
}
if (!quiet)
{
if (stage != ANALYZE_NO_STAGE)
@ -477,7 +514,9 @@ vacuum_one_database(const char *dbname, vacuumingOptions *vacopts,
appendPQExpBuffer(&catalog_query,
" FROM pg_catalog.pg_class c\n"
" JOIN pg_catalog.pg_namespace ns"
" ON c.relnamespace OPERATOR(pg_catalog.=) ns.oid\n");
" ON c.relnamespace OPERATOR(pg_catalog.=) ns.oid\n"
" LEFT JOIN pg_catalog.pg_class t"
" ON c.reltoastrelid OPERATOR(pg_catalog.=) t.oid\n");
/* Used to match the tables listed by the user */
if (tables_listed)
@ -491,9 +530,43 @@ vacuum_one_database(const char *dbname, vacuumingOptions *vacopts,
* processed in which case the user will know about it.
*/
if (!tables_listed)
{
appendPQExpBuffer(&catalog_query, " WHERE c.relkind OPERATOR(pg_catalog.=) ANY (array["
CppAsString2(RELKIND_RELATION) ", "
CppAsString2(RELKIND_MATVIEW) "])\n");
has_where = true;
}
/*
* For --min-xid-age and --min-mxid-age, the age of the relation is the
* greatest of the ages of the main relation and its associated TOAST
* table. The commands generated by vacuumdb will also process the TOAST
* table for the relation if necessary, so it does not need to be
* considered separately.
*/
if (vacopts->min_xid_age != 0)
{
appendPQExpBuffer(&catalog_query,
" %s GREATEST(pg_catalog.age(c.relfrozenxid),"
" pg_catalog.age(t.relfrozenxid)) "
" OPERATOR(pg_catalog.>=) '%d'::pg_catalog.int4\n"
" AND c.relfrozenxid OPERATOR(pg_catalog.!=)"
" '0'::pg_catalog.xid\n",
has_where ? "AND" : "WHERE", vacopts->min_xid_age);
has_where = true;
}
if (vacopts->min_mxid_age != 0)
{
appendPQExpBuffer(&catalog_query,
" %s GREATEST(pg_catalog.mxid_age(c.relminmxid),"
" pg_catalog.mxid_age(t.relminmxid)) OPERATOR(pg_catalog.>=)"
" '%d'::pg_catalog.int4\n"
" AND c.relminmxid OPERATOR(pg_catalog.!=)"
" '0'::pg_catalog.xid\n",
has_where ? "AND" : "WHERE", vacopts->min_mxid_age);
has_where = true;
}
/*
* Execute the catalog query. We use the default search_path for this
@ -1152,6 +1225,8 @@ help(const char *progname)
printf(_(" -f, --full do full vacuuming\n"));
printf(_(" -F, --freeze freeze row transaction information\n"));
printf(_(" -j, --jobs=NUM use this many concurrent connections to vacuum\n"));
printf(_(" --min-mxid-age=MXID_AGE minimum multixact ID age of tables to vacuum\n"));
printf(_(" --min-xid-age=XID_AGE minimum transaction ID age of tables to vacuum\n"));
printf(_(" -q, --quiet don't write any messages\n"));
printf(_(" --skip-locked skip relations that cannot be immediately locked\n"));
printf(_(" -t, --table='TABLE[(COLUMNS)]' vacuum specific table(s) only\n"));