问题
I have one question about performance of "ORDER BY" in Couchbase 4 Beta (Ubuntu 64bits).
I create a Bucket "testing" and a primary index:
CREATE PRIMARY INDEX `testing-idx` ON `testing` USING GSI;
And a second index:
CREATE INDEX testing_field_value_idx ON `testing`(field_value) USING GSI
In my bucket I have items such as:
{
"type": "entry",
"field_name": "field-testing",
"field_value": "1 bla bla bla bla bla bla bla bla"
},
{
"type": "entry",
"field_name": "field-testing",
"field_value": "2 bla bla bla bla bla bla bla bla"
},
{
"type": "entry",
"field_name": "field-testing",
"field_value": "3 bla bla bla bla bla bla bla bla"
}
...
When I execute the query without ORDER BY the response is fast (milliseconds):
SELECT field_value FROM testing LIMIT 10;
1.000 items: 53 ms
100.000 items: 82 ms
But when I execute the query with ORDER BY, the response is slow (seconds):
SELECT field_value FROM testing ORDER BY field_value ASC LIMIT 10;
1.000 items: 4.6 secs
100.000 items: 6.2 secs
How to get better performance with ORDER BY?
** All the queries are executed in "cbq".
来源:https://stackoverflow.com/questions/30670366/couchbase-4-beta-order-by-performance