Alrodemoa opened a new issue #7390:
URL: https://github.com/apache/skywalking/issues/7390


   Please answer these questions before submitting your issue.
   
   - Why do you submit this issue?
   - [ ] Question or discussion
   - [*] Bug
   - [ ] Requirement
   - [ ] Feature or performance improvement
   
   ___
   ### Question
   - What do you want to know?
   All data from trace are deleted
   ___
   ### Bug
   - Which version of SkyWalking, OS, and JRE?
    apache-skywalking-apm-8.6.0
   Oracle linux 7.9
   OpenJDK Runtime Environment 18.9 (build 11.0.11+9-LTS)
   - Which company or project?
   
   - What happened?
   If possible, provide a way to reproduce the error. e.g. demo application, 
component version.
   
![изображение](https://user-images.githubusercontent.com/40126319/127492188-542b1dab-41ed-4868-9c55-a7787b110a7c.png)
   All the transmitted data in the monitoring was lost. There were no changes 
on the servers. I see errors in the logs indicating the absence of a number of 
tables, this happens for the 2nd time after about 2 weeks of use, what can 
affect this? I attach the log below.
   
   
   ___
   ### Requirement or improvement
   - Please describe your requirements or improvement suggestions.
   2021-07-29 12:46:28,044 - 
org.apache.skywalking.oap.server.storage.plugin.jdbc.h2.dao.H2NetworkAddressAliasDAO
 - 71 [pool-7-thread-1] ERROR [] - Table "NETWORK_ADDRESS_ALIAS" not found; SQL 
statement:
   
   2021-07-29 12:46:38,044 - 
org.apache.skywalking.oap.server.telemetry.api.HealthCheckMetrics - 71 
[pool-7-thread-1] ERROR [] - Health check fails
   org.h2.jdbc.JdbcSQLException: Table "NETWORK_ADDRESS_ALIAS" not found; SQL 
statement:
   
   2021-07-29 03:18:17,109 - 
org.apache.skywalking.oap.server.telemetry.api.HealthCheckMetrics - 71 
[pool-6-thread-1] ERROR [] - Health check fails
   org.h2.jdbc.JdbcSQLException: Table "BROWSER_APP_PAGE_RESOURCE_ERROR_SUM" 
not found; SQL statement:
   
   2021-07-26 18:33:17,183 - 
org.apache.skywalking.oap.server.core.storage.ttl.DataTTLKeeperTimer - 71 
[pool-6-thread-1] WARN  [] - History of envoy_parent_connections_used delete 
failure
   2021-07-26 18:33:17,183 - 
org.apache.skywalking.oap.server.core.storage.ttl.DataTTLKeeperTimer - 71 
[pool-6-thread-1] ERROR [] - Table "ENVOY_PARENT_CONNECTIONS_USED" not found; 
SQL statement:
   
   And some tables are not found. Why ist happening?
   


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