插入一亿条数据
(示例数据库:9.3.5)
参考资料:http://www.oschina.net/question/96003_70381
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test=# insert into tbl_time1 select generate_series(1,100000000),clock_timestamp(),now();
INSERT 0 100000000
Time: 525833.218 ms
约:8.7分钟 |
COUNT,没有索引,1亿条数据。
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test=# select count(1) from tbl_time1;
count ----------- 100000000
(1 row)Time: 3070658.058 ms
约:51.2分钟 |
添加主键索引耗时
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test=# alter table tbl_time1 add primary key (id);
ALTER TABLE
Time: 981276.804 ms
约:16.4分钟 |
COUNT,有索引(主键),1亿条数据,注意 where id > 0 的条件
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这个有 where id > 0
test=# select count(id) from tbl_time1 where id > 0;
count ----------- 100000000
(1 row)Time: 244243.112 ms
约:4.071分钟 |
COUNT,有索引(主键),1亿条数据,注意没有 where id > 0 的条件
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这个无 where id > 0
test=# select count(id) from tbl_time1;
count ----------- 100000000
(1 row)Time: 548650.606 ms
约:9.144分钟 |
通过修改配置文件调优postgresql.conf
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enable_bitmapscan = off
enable_hashagg = on
enable_hashjoin = on
enable_indexscan = on
enable_indexonlyscan = on
#enable_material = on
#enable_mergejoin = on
#enable_nestloop = on
enable_seqscan = off
#enable_sort = on
enable_tidscan = off
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test=# select count(id) from tbl_time1 where id > 0;
count -----------100000000(1 row)Time: 87501.151 ms
约:1.456分钟 |