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From Josh Elser <els...@apache.org>
Subject Re: Is there any way to using appropriate index automatically?
Date Thu, 22 Aug 2019 12:18:45 GMT
Sorry 'bout that. Missed that you were doing a local index. Thanks for 
catching my slack, Ankit and Vincent.

On 8/20/19 4:49 AM, you Zhuang wrote:
> Er, I also read the sentence “Unlike global indexes, local indexes 
> /will/ use an index even when all columns referenced in the query are 
> not contained in the index. This is done by default for local indexes 
> because we know that the table and index data co-reside on the same 
> region server thus ensuring the lookup is local.”
> 
> I ‘m totally confused.
> 
> 
>> On Aug 20, 2019, at 12:32 AM, Josh Elser <elserj@apache.org 
>> <mailto:elserj@apache.org>> wrote:
>>
>> http://phoenix.apache.org/faq.html#Why_isnt_my_secondary_index_being_used
>>
>> On 8/19/19 6:06 AM, you Zhuang wrote:
>>> Phoenix-version: 4.14.3-HBase-1.4-SNAPSHOT
>>> hbase-version: 1.4.6
>>> Table:
>>> CREATE TABLE test_phoenix.app (
>>> dt integer not null,
>>> a bigint not null ,
>>> b bigint not null ,
>>> c bigint not null ,
>>> d bigint not null ,
>>> e bigint not null ,
>>> f bigint not null ,
>>> g bigint not null ,
>>> h bigint not null ,
>>> i bigint not null ,
>>> j bigint not null ,
>>> k bigint not null ,
>>> m decimal(30,6) ,
>>> n decimal(30,6)
>>> CONSTRAINT pk PRIMARY KEY (dt, a,b,c,d,e,f,g,h,i,j,k)
>>> ) SALT_BUCKETS = 3,UPDATE_CACHE_FREQUENCY = 300000;
>>> Index:
>>> CREATE local INDEX local_c_h_index ON test_phoenix.app (c,h) ASYNC;
>>> (Has been filled data with bulkload and index is active)
>>> Query:
>>> select /*+ INDEX(test_phoenix.app local_c_h_index) */ * from 
>>> TEST_PHOENIX.APP where c=2 and h = 1 limit 5;
>>> select * from TEST_PHOENIX.APP where c=2 and h = 1 limit 5;
>>> The first query will use index local_c_h_index and result shortly, 
>>> the second query won’t , and response slowly.
>>> The explain plan is weird, all showing without using index.
>>>> On Aug 19, 2019, at 5:54 PM, Aleksandr Saraseka 
>>>> <asaraseka@eztexting.com 
>>>> <mailto:asaraseka@eztexting.com><mailto:asaraseka@eztexting.com>>
wrote:
>>>>
>>>> We have no problems with that. I mean indexes are used even without 
>>>> hints, if they're suitable for a query.
>>>> Maybe you can share your Phoenix version, query, index definition 
>>>> and exec plan ?
>>>>
>>>> On Mon, Aug 19, 2019 at 12:46 PM you Zhuang 
>>>> <zhuangzixiaoyou@gmail.com 
>>>> <mailto:zhuangzixiaoyou@gmail.com><mailto:zhuangzixiaoyou@gmail.com>>
wrote:
>>>>
>>>>    Yeah, I mean no hint , use appropriate index automatically. I
>>>>    create a local index  and a query with corresponding index column
>>>>    filter in where clause. But the query doesn’t use index, with
>>>>    index hint it uses it.
>>>>
>>>>
>>>>
>>>> --
>>>> Aleksandr Saraseka
>>>> DBA
>>>> 380997600401
>>>> <tel:380997600401> *•*asaraseka@eztexting.com 
>>>> <mailto:asaraseka@eztexting.com><mailto:asaraseka@eztexting.com>

>>>> *•*eztexting.com 
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> 

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