Best practice when deleting from different table simultainiously
Greetings people,
I have two tables joined with a foreign key contrraint. They are written at the same time to keep the constraint happy but I don't know the best way of deleting them as far as rowsets and datamodels are concerned. Are there "gotchas" like do I delete the row in the foreign key table first?
I am reading thread:http://swforum.sun.com/jive/thread.jspa?forumID=123&threadID=49918
and getting my head around it.
Is there a tutorial which deals with this topic?
I was wondering the best way to go.
Many Thanks.
Phil
is there a "best practice" method for
Without knowing many details about your specifics... I can suggest a few alternatives -
You can definitely build coordinating the deletes into your application - you can automatically delete any FK related entries prior to deleting the master, or, refuse to delete the master until the user goes and explicitly deletes the children... just depends on how you want to manage it.
Also in many databases you can build the cascading delete rules into your database tables themselves.... so that when you delete the master the deletes automatically cascade. I think this is something you typically declare when creating the FK constrataint (delete cascade and update cascade rules).
hth,
v
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Hi,
In my physical model I have some tables that are both fact and dimension table, i.e. in the BMM they are of course separated into Fact and Dim source (2 different units) and it works fine. But I can see that there will be trouble when having more fact tables and I e.g. have a Period dimension pointing to all the different fact tables (different sources).
Seems like the best solution to this is to have an alias of the fact/transaction table and have 2 "copies" of the transaction table (one for fact and one for dimension table) in the physical layer. Only bad thing is that there will then allways be 2 lookups in the same table when fetching data from the dimension and the fact table.
This is not built on a datawarehouse - so the architecture is thereby more complex. Hope this was understandable (trying to make a short story of it).
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NullPointerException when deleting from table with no non-primary keys
We have an object mapped to a table in our database.
This table has two fields that together form a composite key. When we attempt to perform a delete from this table using the mapped object we receive the following exception and stack trace:
java.lang.NullPointerException
at oracle.toplink.descriptors.FieldsLockingPolicy.getAllNonPrimaryKeyFields(Unknown Source)
at oracle.toplink.descriptors.AllFieldsLockingPolicy.getFieldsToCompare(Unknown Source)
at oracle.toplink.descriptors.FieldsLockingPolicy.buildExpression(Unknown Source)
at oracle.toplink.descriptors.FieldsLockingPolicy.buildDeleteExpression(Unknown Source)
at oracle.toplink.internal.descriptors.ObjectBuilder.buildDeleteExpression(Unknown Source)
at oracle.toplink.internal.queryframework.ExpressionQueryMechanism.buildDeleteStatement(Unknown Source)
at oracle.toplink.internal.queryframework.ExpressionQueryMechanism.prepareDeleteObject(Unknown Source)
at oracle.toplink.internal.queryframework.StatementQueryMechanism.deleteObject(Unknown Source)
at oracle.toplink.queryframework.DeleteObjectQuery.execute(Unknown Source)
at oracle.toplink.queryframework.DatabaseQuery.execute(Unknown Source)
at oracle.toplink.publicinterface.Session.internalExecuteQuery(Unknown Source)
at oracle.toplink.publicinterface.UnitOfWork.internalExecuteQuery(Unknown Source)
at oracle.toplink.tools.profiler.PerformanceProfiler.profileExecutionOfQuery(Unknown Source)
at oracle.toplink.publicinterface.Session.executeQuery(Unknown Source)
at oracle.toplink.publicinterface.Session.executeQuery(Unknown Source)
at oracle.toplink.internal.sessions.CommitManager.deleteAllObjects(Unknown Source)
at oracle.toplink.publicinterface.UnitOfWork.commitToDatabase(Unknown Source)
at oracle.toplink.publicinterface.UnitOfWork.commitRootUnitOfWork(Unknown Source)
at oracle.toplink.publicinterface.UnitOfWork.commit(Unknown Source)
<snip remainder of stack trace>
The table definition for our table is as follows:
PK,FK TASK_ID NUMBER NOT NULL
PK,FK USER_ID NUMBER NOT NULL
Each field is a foreign key to another table, however this is not a join table for a many to many relationship.
The mapping definition for the mapped object is as follows:
public Descriptor buildProConSubscriptionDescriptor( )
Descriptor descriptor = new Descriptor( );
descriptor.setJavaClass( mil.usmc.mol.procon.domain.ProConSubscription.class );
descriptor.addTableName( "PRO_CON_SUBSCRIPTION" );
descriptor.addPrimaryKeyFieldName( "PRO_CON_SUBSCRIPTION.TASK_ID" );
descriptor.addPrimaryKeyFieldName( "PRO_CON_SUBSCRIPTION.USER_ID" );
// Descriptor properties.
descriptor.useNoIdentityMap( );
descriptor.setIdentityMapSize( 1000 );
descriptor.useRemoteNoIdentityMap( );
descriptor.setRemoteIdentityMapSize( 1000 );
descriptor.setAlias( "ProConSubscription" );
descriptor.useAllFieldsLocking( );
// Query manager.
descriptor.getQueryManager( ).checkDatabaseForDoesExist( );
//Named Queries
// Event manager.
// Mappings.
DirectToFieldMapping taskIdMapping = new DirectToFieldMapping( );
taskIdMapping.setAttributeName( "taskId" );
taskIdMapping.setGetMethodName( "getTaskId" );
taskIdMapping.setSetMethodName( "setTaskId" );
taskIdMapping.setFieldName( "PRO_CON_SUBSCRIPTION.TASK_ID" );
descriptor.addMapping( taskIdMapping );
DirectToFieldMapping userIdMapping = new DirectToFieldMapping( );
userIdMapping.setAttributeName( "userId" );
userIdMapping.setGetMethodName( "getUserId" );
userIdMapping.setSetMethodName( "setUserId" );
userIdMapping.setFieldName( "PRO_CON_SUBSCRIPTION.USER_ID" );
descriptor.addMapping( userIdMapping );
return descriptor;
Any thoughts as to why this is happening?
Thanks,
Andrew LeeHi Andrew,
AllFieldsLocking isn't designed for this since you have an object that's composed entirely of primary data. You should make use of any other of TopLink's locking policies to make this work. For instance, try useChangedFieldsLocking(), pessimistic or any of the optimistic locking strategies available from within TopLink for this to work based on the design you have outlined.
Darren -
What is the best practice of deleting large amount of records?
hi,
I need your suggestions on best practice of deleting large amount of records of SQL Azure regularly.
Scenario:
I have a SQL Azure database (P1) to which I insert data every day, to prevent the database size grow too fast, I need a way to remove all the records which is older than 3 days every day.
For on-premise SQL server, I can use SQL Server Agent/job, but, since SQL Azure does not support SQL Job yet, I have to use a Web job which scheduled to run every day to delete all old records.
To prevent the table locking when deleting too large amount of records, in my automation or web job code, I limit the amount of deleted records to
5000 and batch delete count to 1000 each time when calling the deleting records stored procedure:
1. Get total amount of old records (older then 3 days)
2. Get the total iterations: iteration = (total count/5000)
3. Call SP in a loop:
for(int i=0;i<iterations;i++)
Exec PurgeRecords @BatchCount=1000, @MaxCount=5000
And the stored procedure is something like this:
BEGIN
INSERT INTO @table
SELECT TOP (@MaxCount) [RecordId] FROM [MyTable] WHERE [CreateTime] < DATEADD(DAY, -3, GETDATE())
END
DECLARE @RowsDeleted INTEGER
SET @RowsDeleted = 1
WHILE(@RowsDeleted > 0)
BEGIN
WAITFOR DELAY '00:00:01'
DELETE TOP (@BatchCount) FROM [MyTable] WHERE [RecordId] IN (SELECT [RecordId] FROM @table)
SET @RowsDeleted = @@ROWCOUNT
END
It basically works, but the performance is not good. One example is, it took around 11 hours to delete around 1.7 million records, really too long time...
Following is the web job log for deleting around 1.7 million records:
[01/12/2015 16:06:19 > 2f578e: INFO] Start getting the total counts which is older than 3 days
[01/12/2015 16:06:25 > 2f578e: INFO] End getting the total counts to be deleted, total count:
1721586
[01/12/2015 16:06:25 > 2f578e: INFO] Max delete count per iteration: 5000, Batch delete count
1000, Total iterations: 345
[01/12/2015 16:06:25 > 2f578e: INFO] Start deleting in iteration 1
[01/12/2015 16:09:50 > 2f578e: INFO] Successfully finished deleting in iteration 1. Elapsed time:
00:03:25.2410404
[01/12/2015 16:09:50 > 2f578e: INFO] Start deleting in iteration 2
[01/12/2015 16:13:07 > 2f578e: INFO] Successfully finished deleting in iteration 2. Elapsed time:
00:03:16.5033831
[01/12/2015 16:13:07 > 2f578e: INFO] Start deleting in iteration 3
[01/12/2015 16:16:41 > 2f578e: INFO] Successfully finished deleting in iteration 3. Elapsed time:
00:03:336439434
Per the log, SQL azure takes more than 3 mins to delete 5000 records in each iteration, and the total time is around
11 hours.
Any suggestion to improve the deleting records performance?This is one approach:
Assume:
1. There is an index on 'createtime'
2. Peak time insert (avgN) is N times more than average (avg). e.g. supposed if average per hour is 10,000 and peak time per hour is 5 times more, that gives 50,000. This doesn't have to be precise.
3. Desirable maximum record to be deleted per batch is 5,000, don't have to be exact.
Steps:
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2. Divide TotalN (1,000,000) with 5,000 gives the number of deleted batches (200) if insert is very even. But since it is not even and maximum inserts can be 5 times more per period, set number of deleted batches should be 200 * 5 = 1,000.
3. Divide 3 days (4,320 minutes) with 1,000 gives 4.32 minutes.
4. Create a delete statement and a loop that deletes record with creation day < today - (3 days ago - 3.32 * I minutes). (I is the number of iterations from 1 to 1,000)
In this way the number of records deleted in each batch is not even and not known but should mostly within 5,000 and even you run a lot more batches but each batch will be very fast.
Frank -
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string_line VARCHAR2(1000);
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table_name VARCHAR2(400);
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Thanks.Thanks for replies. I don't know what I am doing wrong but still not getting this damn thing work...This is the proc i am running now :
declare
table_list UTL_FILE.FILE_TYPE;
string_line VARCHAR2(1000);
tables_count number:=0;
table_name VARCHAR2(4000);
column_name VARCHAR2(4000);
code_text VARCHAR2(2000);
BEGIN
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END IF;
END LOOP;
EXCEPTION
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UTL_FILE.FCLOSE(table_list);
DBMS_OUTPUT.PUT_LINE('Number of Tables processed is : ' || tables_count);
UTL_FILE.FCLOSE(table_list);
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PL/SQL: ORA-00933: SQL command not properly ended
ORA-06550: line 1, column 7:
PL/SQL: SQL Statement ignored
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In CJ20N transaction:
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I want display the details of emp table.. for that I am using this SQL statement.
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SELECT *
FROM emp
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The following query includes rows where mgr is NULL only when the bind variable :mgr is NULL, in which case it displays all rows:
SELECT *
FROM emp
WHERE :mgr = mgr
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saving from Safari as PDF results in an icon with 0 byte volume that fails to open as it is "damaged" Why and how to solve?
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We have the following report script. Its taking 2 hrs to run .... but if we hard code the 70 accounts we get output in 1 min...we used these 3 functions to extract the level 0 accounts //<DIMBOTTOM "Account" //<LINK(<LEV("Account",0)) //<LINK(<LEV("A
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I am unable to see go button in AIA console
when i am login in to AIA console here in console GO button are not avalilabl what 's issue i don't know please help on it
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SpoolNumbers on Spool does not appear
Hi everyone! I used to see the SpoolNumbers in RZ20 transaction on SAP CCMS Monitor Templates -> Spool System some days ago, but nowadays, this report doesn't appear. I don't know if this report was disappeared because one jos doesn't run. I need thi