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Add gin_clean_pending_list function to clean up GIN pending list

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This function cleans up the pending list of the GIN index by
moving entries in it to the main GIN data structure in bulk.
It returns the number of pages cleaned up from the pending list.

This function is useful, for example, when the pending list
needs to be cleaned up *quickly* to improve the performance of
the search using GIN index. VACUUM can do the same thing, too,
but it may take days to run on a large table.

Jeff Janes,
reviewed by Julien Rouhaud, Jaime Casanova, Alvaro Herrera and me.

Discussion: CAMkU=1x8zFkpfnozXyt40zmR3Ub_kHu58LtRmwHUKRgQss7=iQ@mail.gmail.com
This commit is contained in:
Fujii Masao
2016-01-28 12:57:52 +09:00
parent eaf7b1f643
commit 7f46eaf035
9 changed files with 108 additions and 4 deletions
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13
src/test/regress/expected/gin.out
View File

@ -8,7 +8,20 @@ create table gin_test_tbl(i int4[]);
create index gin_test_idx on gin_test_tbl using gin (i) with (fastupdate = on);
insert into gin_test_tbl select array[1, 2, g] from generate_series(1, 20000) g;
insert into gin_test_tbl select array[1, 3, g] from generate_series(1, 1000) g;
select gin_clean_pending_list('gin_test_idx')>10 as many; -- flush the fastupdate buffers
many
------
t
(1 row)
insert into gin_test_tbl select array[3, 1, g] from generate_series(1, 1000) g;
vacuum gin_test_tbl; -- flush the fastupdate buffers
select gin_clean_pending_list('gin_test_idx'); -- nothing to flush
gin_clean_pending_list
------------------------
0
(1 row)
-- Test vacuuming
delete from gin_test_tbl where i @> array[2];
vacuum gin_test_tbl;

6
src/test/regress/sql/gin.sql
View File

@ -10,8 +10,14 @@ create index gin_test_idx on gin_test_tbl using gin (i) with (fastupdate = on);
insert into gin_test_tbl select array[1, 2, g] from generate_series(1, 20000) g;
insert into gin_test_tbl select array[1, 3, g] from generate_series(1, 1000) g;
select gin_clean_pending_list('gin_test_idx')>10 as many; -- flush the fastupdate buffers
insert into gin_test_tbl select array[3, 1, g] from generate_series(1, 1000) g;
vacuum gin_test_tbl; -- flush the fastupdate buffers
select gin_clean_pending_list('gin_test_idx'); -- nothing to flush
-- Test vacuuming
delete from gin_test_tbl where i @> array[2];
vacuum gin_test_tbl;