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From Mamta Satoor <msat...@gmail.com>
Subject Re: Inserting large LOB as a stream...
Date Tue, 16 Feb 2010 19:54:15 GMT
Yes, I just ran into it and trying it. thanks, Dag.

On Tue, Feb 16, 2010 at 11:51 AM, Dag H. Wanvik <Dag.Wanvik@sun.com> wrote:
> Mamta Satoor <msatoor@gmail.com> writes:
>
>
>> Hi,
>>
>> I am working on writing a test for INSERT statement which will cause
>> INSERT trigger to fire. The INSERT is being done into a table with a
>> large BLOB column. The table definition looks as follows create table
>> table1 (id int, status smallint, bl blob(2G))
>>
>> My goal is to run this INSERT statement inside a java program with a
>> limited heap to see if I will run into any OOMs during trigger
>> execution because we are trying to stream the data into memory. The
>> way I am trying to insert large LOB is as follows
>>               System.out.println("Inserting into table1 to cause insert trigger
to fire");
>>               PreparedStatement ps = conn.prepareStatement(
>>                       "insert into table1(id, status, bl) values(101,
0, ?)");
>>               byte[] arr = new byte[300000*1024];
>>               for (int i = 0; i < arr.length; i++)
>>               arr[i] = (byte)4;
>>               ps.setBinaryStream(1, new ByteArrayInputStream(arr), arr.length);
>>               ps.executeUpdate();
>>               conn.commit();
>> But the above code runs into OOM for byte[] arr = new
>> byte[300000*1024]; because I do not have enough heap available. I was
>> wondering if there was a way for me to use a stream to insert a pretty
>> large LOB into my table without having a physical file on the disk
>> from which I will stream the data in. I do not care about the actual
>> data. As shown above, I am just inserting a large quantity of (byte)4
>> in the LOB. Would appreciate if anyone knows of a way for me to stream
>> large data into LOB while running with limited heap.
>
> You might use the same method as used in BlobMemTest, perhaps?
> (LoopingAlphabetStream).
>
> Thanks,
> Dag
>

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