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Record table only size bytes as well in addition to the total size bytes #1149

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Merged
merged 4 commits into from
Apr 18, 2025
Merged

Record table only size bytes as well in addition to the total size bytes #1149

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4bb84e9
Record table only size bytes as well in addition to the total size bytes
Sticksman Apr 9, 2025
5fbd930
Update collector/pg_stat_user_tables.go
Sticksman Apr 17, 2025
b950538
Update collector/pg_stat_user_tables.go
Sticksman Apr 17, 2025
34b93cf
Finish renaming elements to index and table size
Sticksman Apr 17, 2025
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24 changes: 21 additions & 3 deletions collector/pg_stat_user_tables.go
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -156,6 +156,12 @@ var (
[]string{"datname", "schemaname", "relname"},
prometheus.Labels{},
)
statUserTablesOnlySize = prometheus.NewDesc(
prometheus.BuildFQName(namespace, userTableSubsystem, "only_size_bytes"),
"Total disk space used by only this table, in bytes",
[]string{"datname", "schemaname", "relname"},
prometheus.Labels{},
)

statUserTablesQuery = `SELECT
current_database() datname,
Expand All @@ -180,7 +186,8 @@ var (
autovacuum_count,
analyze_count,
autoanalyze_count,
pg_total_relation_size(relid) as total_size
pg_total_relation_size(relid) as total_size,
pg_table_size(relid) as table_only_size
FROM
pg_stat_user_tables`
)
Expand All @@ -198,10 +205,10 @@ func (c *PGStatUserTablesCollector) Update(ctx context.Context, instance *instan
for rows.Next() {
var datname, schemaname, relname sql.NullString
var seqScan, seqTupRead, idxScan, idxTupFetch, nTupIns, nTupUpd, nTupDel, nTupHotUpd, nLiveTup, nDeadTup,
nModSinceAnalyze, vacuumCount, autovacuumCount, analyzeCount, autoanalyzeCount, totalSize sql.NullInt64
nModSinceAnalyze, vacuumCount, autovacuumCount, analyzeCount, autoanalyzeCount, totalSize, tableOnlySize sql.NullInt64
var lastVacuum, lastAutovacuum, lastAnalyze, lastAutoanalyze sql.NullTime

if err := rows.Scan(&datname, &schemaname, &relname, &seqScan, &seqTupRead, &idxScan, &idxTupFetch, &nTupIns, &nTupUpd, &nTupDel, &nTupHotUpd, &nLiveTup, &nDeadTup, &nModSinceAnalyze, &lastVacuum, &lastAutovacuum, &lastAnalyze, &lastAutoanalyze, &vacuumCount, &autovacuumCount, &analyzeCount, &autoanalyzeCount, &totalSize); err != nil {
if err := rows.Scan(&datname, &schemaname, &relname, &seqScan, &seqTupRead, &idxScan, &idxTupFetch, &nTupIns, &nTupUpd, &nTupDel, &nTupHotUpd, &nLiveTup, &nDeadTup, &nModSinceAnalyze, &lastVacuum, &lastAutovacuum, &lastAnalyze, &lastAutoanalyze, &vacuumCount, &autovacuumCount, &analyzeCount, &autoanalyzeCount, &totalSize, &tableOnlySize); err != nil {
return err
}

Expand Down Expand Up @@ -437,6 +444,17 @@ func (c *PGStatUserTablesCollector) Update(ctx context.Context, instance *instan
totalSizeMetric,
datnameLabel, schemanameLabel, relnameLabel,
)

tableOnlySizeMetric := 0.0
if tableOnlySize.Valid {
tableOnlySizeMetric = float64(tableOnlySize.Int64)
}
ch <- prometheus.MustNewConstMetric(
statUserTablesOnlySize,
prometheus.GaugeValue,
tableOnlySizeMetric,
datnameLabel, schemanameLabel, relnameLabel,
)
}

if err := rows.Err(); err != nil {
Expand Down
14 changes: 11 additions & 3 deletions collector/pg_stat_user_tables_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -72,7 +72,8 @@ func TestPGStatUserTablesCollector(t *testing.T) {
"autovacuum_count",
"analyze_count",
"autoanalyze_count",
"total_size"}
"total_size",
"table_only_size"}
rows := sqlmock.NewRows(columns).
AddRow("postgres",
"public",
Expand All @@ -96,7 +97,8 @@ func TestPGStatUserTablesCollector(t *testing.T) {
12,
13,
14,
15)
15,
16)
mock.ExpectQuery(sanitizeQuery(statUserTablesQuery)).WillReturnRows(rows)
ch := make(chan prometheus.Metric)
go func() {
Expand Down Expand Up @@ -128,6 +130,8 @@ func TestPGStatUserTablesCollector(t *testing.T) {
{labels: labelMap{"datname": "postgres", "schemaname": "public", "relname": "a_table"}, metricType: dto.MetricType_COUNTER, value: 12},
{labels: labelMap{"datname": "postgres", "schemaname": "public", "relname": "a_table"}, metricType: dto.MetricType_COUNTER, value: 13},
{labels: labelMap{"datname": "postgres", "schemaname": "public", "relname": "a_table"}, metricType: dto.MetricType_COUNTER, value: 14},
{labels: labelMap{"datname": "postgres", "schemaname": "public", "relname": "a_table"}, metricType: dto.MetricType_GAUGE, value: 15},
{labels: labelMap{"datname": "postgres", "schemaname": "public", "relname": "a_table"}, metricType: dto.MetricType_GAUGE, value: 16},
}

convey.Convey("Metrics comparison", t, func() {
Expand Down Expand Up @@ -173,7 +177,8 @@ func TestPGStatUserTablesCollectorNullValues(t *testing.T) {
"autovacuum_count",
"analyze_count",
"autoanalyze_count",
"total_size"}
"total_size",
"table_only_size"}
rows := sqlmock.NewRows(columns).
AddRow("postgres",
nil,
Expand All @@ -197,6 +202,7 @@ func TestPGStatUserTablesCollectorNullValues(t *testing.T) {
nil,
nil,
nil,
nil,
nil)
mock.ExpectQuery(sanitizeQuery(statUserTablesQuery)).WillReturnRows(rows)
ch := make(chan prometheus.Metric)
Expand Down Expand Up @@ -229,6 +235,8 @@ func TestPGStatUserTablesCollectorNullValues(t *testing.T) {
{labels: labelMap{"datname": "postgres", "schemaname": "unknown", "relname": "unknown"}, metricType: dto.MetricType_COUNTER, value: 0},
{labels: labelMap{"datname": "postgres", "schemaname": "unknown", "relname": "unknown"}, metricType: dto.MetricType_COUNTER, value: 0},
{labels: labelMap{"datname": "postgres", "schemaname": "unknown", "relname": "unknown"}, metricType: dto.MetricType_COUNTER, value: 0},
{labels: labelMap{"datname": "postgres", "schemaname": "unknown", "relname": "unknown"}, metricType: dto.MetricType_GAUGE, value: 0},
{labels: labelMap{"datname": "postgres", "schemaname": "unknown", "relname": "unknown"}, metricType: dto.MetricType_GAUGE, value: 0},
}

convey.Convey("Metrics comparison", t, func() {
Expand Down