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Possibility to use pgstattuple_approx #53

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20 changes: 15 additions & 5 deletions bin/pgcompacttable
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Original file line number Diff line number Diff line change
Expand Up @@ -84,6 +84,8 @@ my %excluded_tables;
my $initial_reindex;
my $no_initial_vacuum;

my $use_pgstattuple_approx;

my %table_info;

unless (GetOptions(
Expand Down Expand Up @@ -119,7 +121,8 @@ unless (GetOptions(
'a|all' => \$all_db,
'N|exclude-schema=s' => \$exclude_schema,
'T|exclude-table=s' => \$exclude_table,
'i|initial-reindex' => \$initial_reindex
'i|initial-reindex' => \$initial_reindex,
'pgstattuple_approx' => \$use_pgstattuple_approx
)) {
show_usage();
exit(0);
Expand Down Expand Up @@ -432,14 +435,17 @@ sub get_bloat_stats {

my $pgstattuple_schema_name = get_pgstattuple_schema_name;

my $pgstattuplefunc = $use_pgstattuple_approx ? 'pgstattuple_approx' : 'pgstattuple';
my $free = $use_pgstattuple_approx ? 'approx_free' : 'free';

return undef unless($pgstattuple_schema_name);

my $sth = _dbh->prepare("SELECT
ceil((size - free_space - dead_tuple_len) * 100 / fillfactor / bs) AS effective_page_count,
ceil((size - ${free}_space - dead_tuple_len) * 100 / fillfactor / bs) AS effective_page_count,
greatest(round(
(100 * (1 - (100 - free_percent - dead_tuple_percent) / fillfactor))::numeric, 2
(100 * (1 - (100 - ${free}_percent - dead_tuple_percent) / fillfactor))::numeric, 2
),0) AS free_percent,
greatest(ceil(size - (size - free_space - dead_tuple_len) * 100 / fillfactor), 0) AS free_space
greatest(ceil(size - (size - ${free}_space - dead_tuple_len) * 100 / fillfactor), 0) AS free_space
FROM (
SELECT
current_setting('block_size')::integer AS bs,
Expand All @@ -453,7 +459,7 @@ sub get_bloat_stats {
pgst.*
FROM pg_catalog.pg_class
CROSS JOIN
" . _dbh->quote_identifier($pgstattuple_schema_name) . ".pgstattuple(
" . _dbh->quote_identifier($pgstattuple_schema_name) . ".$pgstattuplefunc(
(quote_ident(?) || '.' || quote_ident(?))) AS pgst
WHERE pg_catalog.pg_class.oid = (quote_ident(?) || '.' || quote_ident(?))::regclass
) AS sq");
Expand Down Expand Up @@ -2130,6 +2136,10 @@ SQL statement to be called after each round against current database

A maximum number of retries in case of unsuccessful processing. By default 10.

=item B<--pgstattuple_approx>

Use the function pgstattuple_approx instead of pgstattuple.

=back

=cut
Expand Down