Bem, cliquei com o botão direito em cima da tabela e apareceu uma janela com
as opçoes: VACUM, ANALYSE, REINDEX.

Marquei a opção VACUM e logo abaixo novas opções apareceram: FULL, FREEZE e
ANALYSE, marquei todas elas e mandei executar, em seguida, tive a seguinte
saída na aba 'mensagens' localizada na parte inferior da janela:


INFO:  vacuuming "public.tb2"INFO:  "tb2": found 0 removable, 700001
nonremovable row versions in 5834 pages
DETAIL:  0 dead row versions cannot be removed yet.
Nonremovable row versions range from 56 to 62 bytes long.
There were 0 unused item pointers.
Total free space (including removable row versions) is 52116 bytes.
0 pages are or will become empty, including 0 at the end of the table.
1 pages containing 5448 free bytes are potential move destinations.
CPU 0.12s/0.31u sec elapsed 1.08 sec.INFO:  index "tb2_pkey" now contains
700001 row versions in 1922 pages
DETAIL:  0 index pages have been deleted, 0 are currently reusable.
CPU 0.03s/0.00u sec elapsed 0.03 sec.INFO:  index "tb2_idx" now contains
700001 row versions in 1922 pages
DETAIL:  0 index pages have been deleted, 0 are currently reusable.
CPU 0.01s/0.01u sec elapsed 0.03 sec.INFO:  "tb2": moved 0 row versions,
truncated 5834 to 5834 pages
DETAIL:  CPU 0.00s/0.00u sec elapsed 0.02 sec.
INFO:  analyzing "public.tb2"INFO:  "tb2": scanned 3000 of 5834 pages,
containing 360001 live rows and 0 dead rows; 3000 rows in sample, 700082
estimated total rowsTempo total de execução da consulta: 1289 ms.

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