Very CONFUSED about invalidation and last_load_time from v$ sql.

Hi all.

I'm very confused on the definitions of column of v$ sql.
The oracle is envirenment 10.2.0.4 RAC 3-node.

The following comes from gv$ sql.

--------------
INST_ID select sql_id, child_number out.
hash_value, plan_hash_value,
first_load_time, last_load_time, loads, invalidations
SGS $ t sql
where 1 = 1
and sql_id = "5hnvqby4tyvt9."
/

1 5hnvqby4tyvt9 0 2308927273 1898129466 2011-07-17/07: 45:00 2011-07-17/07: 45:00 1-0
2 5hnvqby4tyvt9 0 2308927273 1898129466 2011-07-17/07: 51:18 2011-07-25/06: 9 1 30:07

---------------
1. no changes are object-definition related to the tables in the query of '5hnvqby4tyvt9 '.

2. currently, the sql in the nodes 1 and 2 has the same PLAN_HASH_VALUE.

3. in nodes 1 and 2, the sql has been loaded in the library cache,
2011-07-17/07: 45:00 and 2011-07-17/07: 51:18 respectively.

4. However, last_load_time differs from the other.
-the node 1: last_load_time is ' 2011-07-17/07: 45:00 ' and invalidations is 0.
-node 2: last_load_time's ' 2011-07-25/06: 30:07 ' and invalidations is 9.

---------------

My question is:

1. What is the difference in last_load_time between node 1 and node 2?

2. What is the difference made in disqualifications between node 1 and node 2?

3 I know, that when it changed the definition of table, sql cursor becomes invalid.
However, there was no change in the definitions of the query table.

What could make a child cursor in the cache library not valid?

4. According to the manual of oracle
(http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/dynviews_2113.htm#REFRN30246),

LAST_LOAD_TIME means 'time in which the query plan (memory segment 6) has been loaded in the library cache'

However, the plan_hash_value 1-node and node-2 has the same value,
even if the child in node-2 sql cursor has been re-charge 9 times since the first loading in the library cache.

What it means?

------

Thanks in advance.
Best regards.

869578 wrote:

parts of the cursor (mainly the lot 6, the execution plan) can age due to pressure of space

When 'PARTS' of a cursor has become aged because of the pressure of space,
It increases the number of invalidation count(v$sql)?

Yes.

In addition, in the case above (parts of a cursor have become aged because of the pressure of space in the library cache),
the update of last_load_time(v$sql) does not always mean "sql plan of change."

Is this good?

Hmmm, let me think for a moment. I think it's always true when we see invalidations, it's the SQL Plan, which has been invalidated. This is not to say that the plan changed, however. You could get a plan struck down for trivial reasons, say, a grant or revoke them on a table. After that, on reload, the plan that is generated can be identical to the regime that had just been invalidated.

Hope that helps,

-Mark

Tags: Database

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