The reason for the slow investigation based Phoenix Phoenix HBase indexed and integrated data analysis HBase HBase query speed

reference:

Phoenix integration with HBase data analysis

HBase cause of slow queries investigation

 

Execute the following statement in DBeaver in:

select * from ASSET_NORMAL WHERE ASSET_ID='19-1151444153020846080';

returned messages:

3d8f2cf978094a47b2f24dea58fa697c     19 - 1,151,444,153,020,846,080     computers     1001005     information equipment     1001005002 ......

as follows:

Execute the following statement in DBeaver in:

select count(*) from ASSET_NORMAL;

returned messages:

10,614

as follows:

Execute the following statement in DBeaver in:

explain select count(*) from ASSET_NORMAL;

returned messages:

CLIENT 1-CHUNK PARALLEL 1-WAY FULL SCAN OVER IDX_ASSET_NORMAL
    SERVER FILTER BY FIRST KEY ONLY
    SERVER AGGREGATE INTO SINGLE ROW
CLIENT 200 ROW LIMIT

as follows:

Execute the following statement in DBeaver in:

explain select * from ASSET_NORMAL WHERE ASSET_ID='19-1151444153020846080';

returned messages:

CLIENT 1-CHUNK 200 ROWS 177000 BYTES SERIAL 1-WAY ROUND ROBIN RANGE SCAN OVER IDX_ASSET_NORMAL ['19-1151444153020846080']    177000    200    0
    SERVER FILTER BY FIRST KEY ONLY    177000    200    0
    SERVER 200 ROW LIMIT    177000    200    0
CLIENT 200 ROW LIMIT    177000    200    0

如下：

直接通过Bash进行操作，执行下列语句：

select count(*) from ASSET_NORMAL;

耗时0.071s，返回如下信息：

0: jdbc:phoenix:node3:2181:/hbase> select count(*) from ASSET_NORMAL;
+-----------+
| COUNT(1)  |
+-----------+
| 11286     |
+-----------+
1 row selected (0.071 seconds)

执行下列语句：

explain select count(*) from ASSET_NORMAL;

耗时0.03s，返回如下信息：

0: jdbc:phoenix:node3:2181:/hbase> explain select count(*) from ASSET_NORMAL;
+----------------------------------------------------------------+-----------------+----------------+--------------+
|                              PLAN                              | EST_BYTES_READ  | EST_ROWS_READ  | EST_INFO_TS  |
+----------------------------------------------------------------+-----------------+----------------+--------------+
| CLIENT 1-CHUNK PARALLEL 1-WAY FULL SCAN OVER IDX_ASSET_NORMAL  | null            | null           | null         |
|     SERVER FILTER BY FIRST KEY ONLY                            | null            | null           | null         |
|     SERVER AGGREGATE INTO SINGLE ROW                           | null            | null           | null         |
+----------------------------------------------------------------+-----------------+----------------+--------------+
3 rows selected (0.03 seconds)