In development server, due to the fact that process design will always get updated and developed, there will be more and more XPDLs cached in the memory. In the long run, this may cause "java.lang.OutOfMemoryError" exception during runtime or server startup. To solve this issue, we will need to clean up the unused XPDLs with following steps. The following example queries are written in MySQL and MSSQL syntax.
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在开发服务器中，由于进程设计总是会得到更新和开发的，所以内存中会有越来越多的XPDL缓存。从长远来看，这可能会在运行时或服务器启动时导致“ java.lang.OutOfMemoryError ”异常。要解决这个问题，我们需要按照以下步骤清理未使用的XPDL。以下示例查询是使用MySQL和MSSQL语法编写的。 |
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1. Please shutdown your application server. 2. Please do a full database backup before proceeding to the following steps. | Chinese |
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请在进行以下步骤之前先完成数据库备份。 |
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1. Check existing count of XPDLs
On a common production server, normally there are only few app versions and each version only tied to 1 process version. This is because we won't do any development in production server, so the process version is only increased during the app imported. But in the development server, it will be a different case. The process version will be going up to few hundred process version which also means there are few hundred of XPDL data are cached in memory. To check how many XPDLs are cached, please run the following query in your database server.
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在通用的生产服务器上，通常只有少数应用程序版本，每个版本只与1个进程版本绑定。这是因为我们不会在生产服务器上进行任何开发，所以进程版本只会在导入的应用程序中增加。但是在开发服务器中，情况会有所不同。进程版本将上升到几百个进程版本，这也意味着有几百个XPDL数据被缓存在内存中。要检查缓存了多少XPDL，请在数据库服务器中运行以下查询。 |
| Code Block |
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| language | sql |
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| title | MySQL, MSSQL, Oracle |
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select count(*) from SHKXPDLS |
2. Check the count of unused XPDLs
In all the cached process version XPDLs, there is a case that some process version is not used by any process instances. These unused XPDLs can be safely deleted. The check the number of unused XPDLs, we can use the following query. Then, we can know how many are unused in the total number of XPDLs.
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在所有缓存的进程版本XPDL中，有一些进程版本没有被任何进程实例使用。这些未使用的XPDL可以安全地删除。检查未使用的XPDL的数量，我们可以使用下面的查询。然后，我们可以知道在XPDL的总数中有多少是未使用的。 |
| Code Block |
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| language | sql |
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| title | MySQL, MSSQL |
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select count(*) from SHKXPDLS x
where concat(x.XPDLId, x.XPDLVersion) not in (
select concat(packageId,packageVersion) as id from (
select def.PackageId as packageId, def.ProcessDefinitionVersion as packageVersion
from SHKActivities act
join SHKProcesses pro on act.Process = pro.oid
left join SHKProcessDefinitions def on pro.ProcessDefinition = def.oid
group by def.PackageId, def.ProcessDefinitionVersion
union
select packageId, packageVersion from app_package
) as used_processes group by packageId, packageVersion
); |
...
If you would like to list the process versions, you can use the following query.
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如果您想列出流程版本，则可以使用以下查询。 |
| Code Block |
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| language | sql |
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| title | MySQL, MSSQL |
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select * from SHKXPDLS x
where concat(x.XPDLId, x.XPDLVersion) not in (
select concat(packageId,packageVersion) as id from (
select def.PackageId as packageId, def.ProcessDefinitionVersion as packageVersion
from SHKActivities act
join SHKProcesses pro on act.Process = pro.oid
left join SHKProcessDefinitions def on pro.ProcessDefinition = def.oid
group by def.PackageId, def.ProcessDefinitionVersion
union
select packageId, packageVersion from app_package
) as used_processes group by packageId, packageVersion
); |
...
3. Delete completed process instances data to clean up more XPDLs from cache
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3.删除已完成的流程实例数据以清除缓存中的更多XPDL |
If the process instances data are not important to you or you have your process instance data captured a copy by the Process Data Collector plugin, you can delete your process instances data to increase the number of unused XPDLs. In this case, only the process version for running process instances and the latest process version for each app version will be kept.
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如果流程实例数据对您并不重要，或者您的流程实例数据被Process Data Collector 插件捕获了副本，则 可以删除流程实例数据以增加未使用的XPDL的数量。在这种情况下，只保存运行流程实例的流程版本和每个应用程序版本的最新流程版本。 |
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SET FOREIGN_KEY_CHECKS=0;
delete sa from SHKAssignmentsTable as sa
left join SHKProcesses as sp on sa.ActivityProcessId = sp.ID
where (sp.State = 1000006 or sp.State = 1000008 or sp.State = 1000010);
delete sad from SHKAndJoinTable as saj
left join SHKActivities as sac on saj.Activity = sac.oid
left join SHKProcesses as sp on sac.ProcessId = sp.ID
where (sp.State = 1000006 or sp.State = 1000008 or sp.State = 1000010);
delete sad from SHKDeadlines as sd
left join SHKActivities as sac on sd.Activity = sac.oid
left join SHKProcesses as sp on sac.ProcessId = sp.ID
where (sp.State = 1000006 or sp.State = 1000008 or sp.State = 1000010);
delete sad from SHKActivityData as sad
left join SHKActivities as sac on sad.Activity = sac.oid
left join SHKProcesses as sp on sac.ProcessId = sp.ID
where (sp.State = 1000006 or sp.State = 1000008 or sp.State = 1000010);
delete sac from SHKActivities as sac
left join SHKProcesses as sp on sac.ProcessId = sp.ID
where (sp.State = 1000006 or sp.State = 1000008 or sp.State = 1000010);
delete spd from SHKProcessData as spd
left join SHKProcesses as sp on spd.Process = sp.oid
where (sp.State = 1000006 or sp.State = 1000008 or sp.State = 1000010);
delete spr from SHKProcessRequesters as spr
left join SHKProcesses as sp on spr.Id = sp.ID
where (sp.State = 1000006 or sp.State = 1000008 or sp.State = 1000010);
delete from SHKProcesses where (State = 1000006 or State = 1000008 or State = 1000010);
SET FOREIGN_KEY_CHECKS=1; |
...
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delete (select sa.* from SHKAssignmentsTable sa
left join SHKProcesses sp on sa.ActivityProcessId = sp.ID
where (sp.State = 1000006 or sp.State = 1000008 or sp.State = 1000010));
delete sad from SHKAndJoinTable as saj
left join SHKActivities as sac on saj.Activity = sac.oid
left join SHKProcesses as sp on sac.ProcessId = sp.ID
where (sp.State = 1000006 or sp.State = 1000008 or sp.State = 1000010);
delete sad from SHKDeadlines as sd
left join SHKActivities as sac on sd.Activity = sac.oid
left join SHKProcesses as sp on sac.ProcessId = sp.ID
where (sp.State = 1000006 or sp.State = 1000008 or sp.State = 1000010);
delete (select sad.* from SHKActivityData sad
left join SHKActivities sac on sad.Activity = sac.oid
left join SHKProcesses sp on sac.ProcessId = sp.ID
where (sp.State = 1000006 or sp.State = 1000008 or sp.State = 1000010));
delete (select sac.* from SHKActivities sac
left join SHKProcesses sp on sac.ProcessId = sp.ID
where (sp.State = 1000006 or sp.State = 1000008 or sp.State = 1000010));
delete (select spd.* from SHKProcessData spd
left join SHKProcesses sp on spd.Process = sp.oid
where (sp.State = 1000006 or sp.State = 1000008 or sp.State = 1000010));
delete (select spr.* from SHKProcessRequesters spr
left join SHKProcesses sp on spr.Id = sp.ID
where (sp.State = 1000006 or sp.State = 1000008 or sp.State = 1000010));
delete from SHKProcesses where (State = 1000006 or State = 1000008 or State = 1000010); |
...
If you would like to clean the all the process instances data including the running process instances, you can use the following query.
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如果要清除包括正在运行的流程实例在内的所有流程实例数据，则可以使用以下查询。 |
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SET FOREIGN_KEY_CHECKS=0;
delete from SHKAssignmentsTable;
delete from SHKAndJoinTable;
delete from SHKDeadlines;
delete from SHKActivityData;
delete from SHKActivities;
delete from SHKProcessData;
delete from SHKProcessRequesters;
delete from SHKProcesses;
SET FOREIGN_KEY_CHECKS=1; |
...
4. Delete the unused XDPLs
Now, you can delete the unused XPDLs and it will be free from your memory cache when next server startup.
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现在，您可以删除未使用的XPDL，并且在下一次服务器启动时它将从您的内存缓存中释放。 |
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SET FOREIGN_KEY_CHECKS=0;
delete x, xd from SHKXPDLS x join SHKXPDLData xd on x.oid= xd.XPDL
where concat(x.XPDLId, x.XPDLVersion) not in (
select concat(packageId,packageVersion) as id from (
select def.PackageId as packageId, def.ProcessDefinitionVersion as packageVersion
from SHKActivities act
join SHKProcesses pro on act.Process = pro.oid
left join SHKProcessDefinitions def on pro.ProcessDefinition = def.oid
group by def.PackageId, def.ProcessDefinitionVersion
union
select packageId, packageVersion from app_package
) as used_processes group by packageId, packageVersion
);
SET FOREIGN_KEY_CHECKS=1; |
...
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delete (select xd.* from SHKXPDLData xd
left join SHKXPDLS x on x.oid= xd.XPDL
where concat(x.XPDLId, x.XPDLVersion) not in (
select concat(packageId,packageVersion) as id from (
select def.PackageId as packageId, TO_CHAR(def.ProcessDefinitionVersion) as packageVersion
from SHKActivities act
join SHKProcesses pro on act.Process = pro.oid
left join SHKProcessDefinitions def on pro.ProcessDefinition = def.oid
group by def.PackageId, def.ProcessDefinitionVersion
union
select packageId, TO_CHAR(packageVersion) from app_package
) group by packageId, packageVersion
));
delete (select x.* from SHKXPDLS x
where concat(x.XPDLId, x.XPDLVersion) not in (
select concat(packageId,packageVersion) as id from (
select def.PackageId as packageId, TO_CHAR(def.ProcessDefinitionVersion) as packageVersion
from SHKActivities act
join SHKProcesses pro on act.Process = pro.oid
left join SHKProcessDefinitions def on pro.ProcessDefinition = def.oid
group by def.PackageId, def.ProcessDefinitionVersion
union
select packageId, TO_CHAR(packageVersion) from app_package
) group by packageId, packageVersion
));
|
...