thank u ,
now i have tried local index,
for the table:
+------------+------------+------------+------------+
| ROWKEY | col1 | col2 | col3 |
+------------+------------+------------+------------+
| 1 | xuxc | NJ | NJU |
| 2 | abc | SH | null |
*step1:
0: jdbc:phoenix:localhost> create local index local_col1_tbidx on
xxc."tb3"("col1");
2 rows affected (0.619 seconds)
0: jdbc:phoenix:localhost> create local index local_col2_tbidx on
xxc."tb3"("col2");
2 rows affected (0.183 seconds)
*step2:
0: jdbc:phoenix:localhost> explain select "col1","col2" from xxc."tb3";
+------------+
| PLAN |
+------------+
| CLIENT PARALLEL 1-WAY FULL SCAN OVER XXC.tb3 |
+------------+
1 row selected (0.036 seconds)
why local index doesn't works?
and is my SQL incorrect?
--------------------------------------------------------
thank you for your kind!
xuxc
------------------ 原始邮件 ------------------
发件人: "[email protected]";<[email protected]>;
发送时间: 2014年10月24日(星期五) 上午10:47
收件人: "user"<[email protected]>;
主题: Re: 回复: how to use phoenix index to query data?
Fine. If you conduct a select * query, maybe you need to create an index
including all your cols, cause
a global index will only be used if all columns referenced in the query are
contained by it. Maybe you can
try local index. Please read the instructions from the site carefully.
http://phoenix.apache.org/secondary_indexing.html
CertusNet
赛特斯信息科技股份有限公司
发件人： xuxc1120
发送时间： 2014-10-24 10:25
收件人： user
主题： 回复： 回复: how to use phoenix index to query data?
Now the problem is:
I select * from table where [condition col1, condition col2, condition
col3]], (maybe that table have 10 cols),
i create index on every col,such as "create index col1_idx on table(col1);
create index col2_idx on table(col2); ... create index col10_idx on
table(col10)";
and then i execute the query sql "select * from table where [condition col1,
condition col2, condition col3]," .
for 1.8million rows ,it will takes 10sec , as long as use Filter directly in
hbase shell.
i 'd rather know something wrong i have done.
------------------ 原始邮件 ------------------
发件人: "[email protected]";<[email protected]>;
发送时间: 2014年10月24日(星期五) 上午10:09
收件人: "user"<[email protected]>;
主题: Re: 回复: how to use phoenix index to query data?
well. Global index shall need you to include all your query condition columns
to facilitate index usage.
e.g. If you create an index on table (col1), then you may only conduct such
queries as select col1 from table where [condition col1]
If you want to include more query results columns, you can create index on
table (col1) include (col2,col3) as instructions here.
CertusNet
发件人： xuxc1120
发送时间： 2014-10-24 09:52
收件人： user
主题： 回复： Re: how to use phoenix index to query data?
i use "create index "name_idx" on table("info".qulifier");
it is a global index.
so ,how to use "name_idx" to speed query?
------------------ 原始邮件 ------------------
发件人: "[email protected]";<[email protected]>;
发送时间: 2014年10月24日(星期五) 上午9:00
收件人: "user"<[email protected]>;
主题: Re: Re: how to use phoenix index to query data?
You may need to confirm what kind of your index type. global index or local
index, cause they differ a lot in usage.
Explain command shall tell you whether index table works.
CertusNet
From: Eli Levine
Date: 2014-10-23 23:04
To: user
Subject: Re: how to use phoenix index to query data?
The EXPLAIN command should help.
http://phoenix.apache.org/language/index.html#explain
On Thu, Oct 23, 2014 at 5:40 AM xuxc1120 <[email protected]> wrote:
environment：
hadoop-2.3.0-cdh-5.1.0
hbase-0.98.1-cdh-5.1.0
phoenix-4.1.0
i have create a table in phoenix client ,and then create index on some columns,
after that ,i insert data to table,
the data have inserted successful and the index table also have records,
but when i use "select * from tb1 where condition=1 and condition2=2" clause in
the phoenix client , for 180W data, it takes almost 10sec, i want to know if
the index works?
