General LOB Performance Question

[mghale]

Greetings,

I have a client who is using two BLOB columns in two of their tables
for a new database application. I have not had much experience working
with LOB data and wanted to 'pick your brains' as to any general advise
you can give to imporove the performance of these two columns. Max
size is 10 MB. There is only one BLOB in each table.

Currently the BLOB columns are stored in the same tablespace of 32K
page size. Should I put these in a Large tablespace? Any other
thoughts you may have would be greatly appreciated.

Thanks in advance!!!

Martin

[Knut Stolze]

mghale wrote:

Greetings,

I have a client who is using two BLOB columns in two of their tables
for a new database application. I have not had much experience working
with LOB data and wanted to 'pick your brains' as to any general advise
you can give to imporove the performance of these two columns. Max
size is 10 MB. There is only one BLOB in each table.

Currently the BLOB columns are stored in the same tablespace of 32K
page size. Should I put these in a Large tablespace? Any other
thoughts you may have would be greatly appreciated.

How big are the LOBs usually? If they are generally small, then you could
wrap the LOB in a structured type and take advantage of the buffer pool for
the small, inlined values.

The general recommendation for LOBs is to store them in a file system based
tablespace to take advantage of the operating system's file system cache.

--
Knut Stolze
DB2 Information Integration Development
IBM Germany

[mghale]

Thanks.

I actually did wind up storing the blobs in their own tablespace on a
filesystem. The blobs are genearally about 1 MB in size but can be up
to 10 MB...

thanks again for the reply!!!