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From "bd2019us (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (PHOENIX-5224) Iteratively executing the same SQL query will greatly damage the performance
Date Tue, 02 Apr 2019 00:50:00 GMT

     [ https://issues.apache.org/jira/browse/PHOENIX-5224?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

bd2019us updated PHOENIX-5224:
------------------------------
    Labels: pull-request-available  (was: )

> Iteratively executing the same SQL query will greatly damage the performance
> ----------------------------------------------------------------------------
>
>                 Key: PHOENIX-5224
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-5224
>             Project: Phoenix
>          Issue Type: Bug
>            Reporter: bd2019us
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: 1.patch
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Locations: 
> (1) phoenix-core/src/it/java/org/apache/phoenix/end2end/index/IndexRebuildIncrementDisableCountIT.java:170
> (2) phoenix-core/src/it/java/org/apache/phoenix/tx/TxCheckpointIT.java:108
> (3) phoenix-core/src/it/java/org/apache/phoenix/end2end/DeleteIT.java:794,858
> (4) phoenix-core/src/it/java/org/apache/phoenix/end2end/UpsertSelectAutoCommitIT.java:240
> (5) phoenix-core/src/it/java/org/apache/phoenix/end2end/DropTableIT.java:35
> At these locations, the java.sql.Statement is intensively used in a loop and executing
the same SQL query, which will highly damage the performance of database access. In such cases,
java.sql.PreparedStatement should be used to enable the database compiling the SQL command
ahead of time, which has a much better performance compared with Statement.



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