Re: SSD/HDD Performance & Balancing

Adam,

Rob's original code was 1 for Physical Files, and 1 for Logical Files.
I've included 2 others that will span the entire Partition, not just a
single Library. Thank you Rob. These are verified on V7R1, TR9. I do not
recall which Release/TR level introduced these "system" catalogs.

To locate "HOT" physicals files in single production library (ADAM) I run a
query like this:

SELECT TABLE_SCHEMA, TABLE_NAME, MEDIA_PREFERENCE, +
LOGICAL_READS, PHYSICAL_READS, INSERT_OPERATIONS, +
UPDATE_OPERATIONS, DELETE_OPERATIONS, DATA_SIZE
FROM QSYS2.SYSPARTITIONSTAT
WHERE TABLE_SCHEMA = 'ADAM' AND +
PHYSICAL_READS > 0 AND TABLE_SCHEMA NOT LIKE 'Q%'
ORDER BY PHYSICAL_READS DESC


To locate "HOT" physicals files in a single partition I run a query like
this:

SELECT TABLE_SCHEMA, TABLE_NAME, MEDIA_PREFERENCE, +
LOGICAL_READS, PHYSICAL_READS, INSERT_OPERATIONS, +
UPDATE_OPERATIONS, DELETE_OPERATIONS, DATA_SIZE
FROM QSYS2.SYSPARTITIONSTAT
WHERE +
PHYSICAL_READS > 0 AND TABLE_SCHEMA NOT LIKE 'Q%'
ORDER BY PHYSICAL_READS DESC


To locate "HOT" logical files in single production library (ADAM) I run a
query like this:

SELECT TABLE_SCHEMA, TABLE_NAME, INDEX_NAME, MEDIA_PREFERENCE, +
LOGICAL_READS, INDEX_SIZE, INDEX_TYPE, LAST_QUERY_USE, +
QUERY_USE_COUNT, QUERY_STATISTICS_COUNT, LAST_STATISTICS_USE
FROM QSYS2.SYSPARTITIONINDEXSTAT
WHERE TABLE_SCHEMA='ADAM'
ORDER BY LOGICAL_READS DESC


To locate "HOT" logical files in a single partition I run a query like this:

SELECT TABLE_SCHEMA, TABLE_NAME, INDEX_NAME, MEDIA_PREFERENCE, +
LOGICAL_READS, INDEX_SIZE, INDEX_TYPE, LAST_QUERY_USE, +
QUERY_USE_COUNT, QUERY_STATISTICS_COUNT, LAST_STATISTICS_USE
FROM QSYS2.SYSPARTITIONINDEXSTAT
ORDER BY LOGICAL_READS DESC










On Wed, Feb 25, 2015 at 12:20 PM, Adam Driver <AdamD@xxxxxxxxxxx> wrote:

Hi,

Rob, is there any chance you could repost the SQL statement referred to
below?

From Joe's mail:

Better solution 2: Using Sue Baker's prior dialogue, "most customers
place hot data" on SSD's and using Rob D's SQL statement, Identify our top

20/50/100/500 PF's and LF's, and SET their preferred unit with a focus on
getting the SSD's to nearly 90% full, using STRASPBAL TYPE(*MP) .

Thanks!

Adam Driver

Chicago, IL

T: 847-916-9499

M: 224-250-9049

www.linkedin.com/adamdriver<http://www.linkedin.com/adamdriver>

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