Dirty block?

Question

Hi!
I have read in the documentation that dirty buffer block are those blocks that have some changed data. I also read some lines as follows...
"Oracle write dirty buffer blocks to the datafiles and closes the datafile."(in the context of taking a tablespace offline NORMAL mode).
i would just like to confirm if my understanding is right that at this point something similar to "auto commit" is performed and the changes commited to the database.
am I right?? I am confused!
Thanks

Answer 1

Reason 1 :its not that u see with ur naked Eyes
to be simple ...when u load the data its dirty l and whn u calculate the same data its clean thats all
When Intelligent Calculation is enabled, Essbase calculates only dirty blocks and their dependent
parents. When disabled, Essbase calculates all data blocks, regardless of whether they are marked
as clean or dirty.
To be much more specific:
Marking Blocks As Clean
Essbase marks data blocks as clean in these types of calculations:
● A full calculation (CALC ALL) of a database (the default calculation).
● A calculation script that calculates all the dimensions in one CALC DIM statement.
For example, the following calculation script calculates all members in the Sample Basic
database:
CALC DIM(Measures, Product, Market, Year, Scenario);
Compare this calculation script to a calculation script that calculates all the members with
two CALC DIM statements:
Marking Blocks as Dirty
Essbase marks a data block as dirty in the following situations:
● Calculating the data block for a partial calculation of the database only if SET
CLEARUPDATESTATUS AFTER is not part of the partial calculation statement in the
calculation script
● Loading data into the data block
● Restructuring the database (for example, by adding a member to a dense dimension)
● Copying data to the data block; for example, using DATACOPY
Reason 2 : I may be making assumptions here, but are you asking how to find out if a cube has dirty blocks? If that is the case there are two ways that I know of
1) Log into the cube through the excel add-in, go to "Calculation..." and under "Database State" it will say something like "Data values have been changed since the last calculation"
2) Using the VB API (could be in the other apis too) run the "EsbGetDatabaseInfo" function, then check the "Data" value in the ESB_DBINFO_T structure. if it is not ESB_DBDATA_CLEAN then the data has dirty blocks in it.
Actully it has been discussed earlier this week so ....