How do I know If i will be able to go back to lion from maverick?

I have downloaded Maverick in my computer but i dont want it anymore, i have been reading and i understand that I can go back to the original OS that came with my machine when i bought it if y command option r when i boot my imac and the erase the macintosh hd. My question is, is it for sure that Lion OS will appear in the utilities after erasing hd macintosh? Because when I boot th imca pressing the option key what I see is, two disks, Macintosh HD and INternet Recovery 10.9.3, which is maverick, what does it mean? PLease help!!! thanks!!!

You already posted this question and got your answers.
Please follow the instructions in your original posting!
https://discussions.apple.com/thread/6355343?tstart=0
You will need to erase your main OS X partition first, but leave the recovery partition.
If you erase the main partition first, OS X Recovery install WILL reinstall the original OS X version that came on your Mac.
You got good info and advice from regular contributors that have even more Mac experience than I.

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How can i know which index will be used when executing the query ?

1 ) I have query in which i have 3-4 tables but there multiple index on one column .
so how can i know which index will be used when executing the query ?
2) I have a query which ia taking too much time . how can i know which table is taking too much time ?
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Hi Jimmy,
Consider the below example
/* Formatted on 2011/02/04 21:59 (Formatter Plus v4.8.8) */
CREATE TABLE FIRST AS
SELECT * FROM all_objects;
UPDATE FIRST
SET object_name = 'TEST'
WHERE owner != 'SCOTT';
CREATE INDEX idx_first ON FIRST(object_name);
SELECT *
FROM FIRST
WHERE object_name = 'TEST';
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Plan hash value: 2265626682
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 58678 | 7334K| 163 (4)| 00:00:02 |
|* 1 | TABLE ACCESS FULL| FIRST | 58678 | 7334K| 163 (4)| 00:00:02 |
/* Formatted on 2011/02/04 21:59 (Formatter Plus v4.8.8) */
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WHERE object_name = 'emp';
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Execution Plan
Plan hash value: 1184810458
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 128 | 1 (0)| 00:00:01 |
| 1 | TABLE ACCESS BY INDEX ROWID| FIRST | 1 | 128 | 1 (0)| 00:00:01 |
|* 2 | INDEX RANGE SCAN | IDX_FIRST | 1 | | 1 (0)| 00:00:01 |
From this we can come to the conclusion that, whether to use one index or not by oracle
would also depend on the data which is present in the table. This has to be this way as
we see in the bind peeking, if oracle sticks to only one plan, say only use the full table
scan, it would be a performance hit when it searches for the second query ie where object_name
='emp';
2.
If we have a query like below.
select * from emp
where upper(ename) = upper(:p_ename);
Evenif we have the index on ename column, oracle wouldn't be able to use the index, as there is a function in the predicate column. If you need oracle to use the index, we need to create a function based index as below.
Create index idx_ename on emp(upper(ename));
Regards,
Cool

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mariamvb wrote:
Is the apple software compatible with Microsoft office? May I know if I will be able to save al of my work from Microsoft office to the apple software?
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HT1338 How to go back to lion from mountain lion????

Plese explian, How to go back to lion from mountain lion?

Time Machine does not provide bootable backups. Therefore, this is not the solution.
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How do I know If i will be able to go back to lion from maverick?

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