Should reality be half again as large as the estimated row count? coon=# select count(*) from sui.segment; count ---------- 49,942,837 -- my commas (1 row) coon=# vacuum (analyse, verbose) sui.probandset; INFO: vacuuming "sui.probandset" INFO: scanned index "probandset_pkey" to remove 3122 row versions DETAIL: CPU: user: 4.70 s, system: 1.45 s, elapsed: 26.97 s INFO: scanned index "probandsetunique" to remove 3122 row versions DETAIL: CPU: user: 5.99 s, system: 10.24 s, elapsed: 97.42 s INFO: "probandset": removed 3122 row versions in 1951 pages DETAIL: CPU: user: 0.04 s, system: 0.00 s, elapsed: 0.73 s INFO: index "probandset_pkey" now contains 33655227 row versions in 259175 pages DETAIL: 3122 index row versions were removed. 0 index pages have been deleted, 0 are currently reusable. CPU: user: 0.00 s, system: 0.00 s, elapsed: 0.05 s. INFO: index "probandsetunique" now contains 33655227 row versions in 1231894 pages DETAIL: 3121 index row versions were removed. 0 index pages have been deleted, 0 are currently reusable. CPU: user: 0.00 s, system: 0.00 s, elapsed: 0.05 s. INFO: "probandset": found 890 removable, 90624 nonremovable row versions in 4039 out of 2244646 pages DETAIL: 0 dead row versions cannot be removed yet, oldest xmin: 288037 There were 5463 unused item pointers. Skipped 0 pages due to buffer pins, 564917 frozen pages. 0 pages are entirely empty. CPU: user: 10.91 s, system: 11.80 s, elapsed: 131.01 s. INFO: vacuuming "pg_toast.pg_toast_18165" INFO: index "pg_toast_18165_index" now contains 0 row versions in 1 pages DETAIL: 0 index row versions were removed. 0 index pages have been deleted, 0 are currently reusable. CPU: user: 0.00 s, system: 0.00 s, elapsed: 0.01 s. INFO: "pg_toast_18165": found 0 removable, 0 nonremovable row versions in 0 out of 0 pages DETAIL: 0 dead row versions cannot be removed yet, oldest xmin: 288037 There were 0 unused item pointers. Skipped 0 pages due to buffer pins, 0 frozen pages. 0 pages are entirely empty. CPU: user: 0.00 s, system: 0.00 s, elapsed: 0.03 s. INFO: analyzing "sui.probandset" INFO: "probandset": scanned 30000 of 2244646 pages, containing 448480 live rows and 0 dead rows; 30000 rows in sample, 33555961 estimated total rows VACUUM Time: 535436.137 ms (08:55.436) coon=# reindex table sui.segment coon-# ; REINDEX Time: 681530.451 ms (11:21.530) coon=# select count(*) from sui.segment; count ---------- 49942837 (1 row)
