I am trying to lower the number of Oracle DB roundtrips to get primary
keys/sequences.
I have tried setting the following Wonder properties
-er.extensions.ERXJDBCAdaptor.className er.extensions.jdbc.ERXJDBCAdaptor
-er.extensions.ERXPrimaryKeyBatchSize 1
and changing one of my entities user info dictionary to:
userInfo = {
"_EntityModeler" = {generateSource = NO; };
modificationDate = "2000-04-20 12:37:17 -0700";
ERXPrimaryKeyBatchSize = 10;
};
Now Wonder select 10 primary keys and caches them. The only issue is JDBC does
not allow batching of select so this only changes the sequence of how the
primary keys are fetched. This causes a database roundtrip for each primary key
needed.
I am wondering if anyone has subclassed ERXJDBCAdaptor or JDBCAdaptor and
created an adaptor the uses the Oracle sequence increment to reduce database
roundtrips to acquire a “batch” of sequences.
— Oracle query sequence increment value to determine the sequence "batch size".
SELECT INCREMENT_BY FROM ALL_SEQUENCES WHERE SEQUENCE_NAME=’TABLE_NAME_SEQ';
— Oracle change sequence increment to 10 ("batch size" to 10)
ALTER SEQUENCE TABLE_NAME_SEQ INCREMENT BY 10;
JR
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