[jira] [Commented] (SCB-829) An index on TxEvent (globalTxId) should be added

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SCB-829?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16575114#comment-16575114 ] 

ASF GitHub Bot commented on SCB-829:
------------------------------------

oliugian opened a new pull request #246: SCB-829 An index on TxEvent (globalTxId) should be added
URL: https://github.com/apache/incubator-servicecomb-saga/pull/246
 
 
   
   https://issues.apache.org/jira/browse/SCB-829
   

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> An index on TxEvent (globalTxId) should be added
> ------------------------------------------------
>
>                 Key: SCB-829
>                 URL: https://issues.apache.org/jira/browse/SCB-829
>             Project: Apache ServiceComb
>          Issue Type: Improvement
>          Components: Saga
>    Affects Versions: saga-0.3.0
>         Environment: postgres and mysql
>            Reporter: FuChenGeng
>            Priority: Minor
>              Labels: easyfix
>             Fix For: saga-0.3.0
>
>   Original Estimate: 10m
>  Remaining Estimate: 10m
>
> When the amount of data in the TxEvent table is large, the select SQL statement of method(
> findByEventGlobalTxIdAndEventType
> )  is executed very slowly. Here, an index on globalTxId should be added.
>  
> Here is the SQL statement. it will be executed 3 times in a transaction with 2 subtransactions.
> @Query("SELECT DISTINCT new org.apache.servicecomb.saga.alpha.core.TxEvent("
>  + "t.serviceName, t.instanceId, t.globalTxId, t.localTxId, t.parentTxId, "
>  + "t.type, t.compensationMethod, t.payloads "
>  + ") FROM TxEvent t "
>  + "WHERE t.globalTxId = ?1 AND t.type = ?2 "
>  + " AND ( SELECT MIN(t1.retries) FROM TxEvent t1 "
>  + " WHERE t1.globalTxId = t.globalTxId "
>  + " AND t1.localTxId = t.localTxId "
>  + " AND t1.type IN ('TxStartedEvent', 'SagaStartedEvent') ) = 0 ")
>  



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