issue of the index
Spfile/init.ora file parameter exists to force the CBO to do the path of execution of a given statement, use an index, even if the index scan may seem to be calculated in the form of more expensive?883532 wrote:
Spfile/init.ora file parameter exists to force the CBO to do the path of execution of a given statement, use an index, even if the index scan may seem to be calculated in the form of more expensive?
It's not a good idea to change any parameter to force using the index, because changing the system can degrade the performance of the entire base.
So you should stick to as much as possible the default values.
However if you want your session with force scan restricted index to table scan the following parameter can be set to make cheap scan index. First parameter i.e. optimizer_index_cost_adj is considered when cacculating table scan vs. index scan and to lower the value would increase the cost of the limited index scan.
OPTIMIZER_INDEX_COST_ADJ (set it low, that is to say less than the 100)
optimizer_mode (all is first_rows)
optimizer_index_caching (increase from 0 to 100)
db_file_multiblock_read_count (decrease of current value)
Use as Index indicator / * + index (table_name, index) * /.
Please note that these setting should never tested on at the level of the system otherwise, there may be a performance impact.
Tags: Database
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Hello
I read about the differences between the systematic index scan range, single scan, skip scan.
According to the docs, to how the CBO Evaluates in-list of iterators, http://docs.oracle.com/cd/B10500_01/server.920/a96533/opt_ops.htm
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(and I think this sentence is somewhere in the docs also).
Thus, when using predicates in the list, why in my case Oracle used the unique scan on primary key column index? Because it wasn't a level playing field.
Thank you.
It is Internet... find us a lot of information a lot but don't know who to trust.
Exactly! It is thought, you should ALWAYS have in the back of your mind when you visit ANY site (no matter the author), read a book or document, listen to no matter WHAT presentation or read responses from forum (that's me included).
All sources of information can and will be errors, omissions and inaccuracies. An example which is used to illustrate a point can involve/suggest that it applies to the related points as well. It's just not possible to cover everything.
Your post doc 9i is a good example. The earliest records (even 7.3 always available online docs) often have a LOT of better explanations and examples of basic concepts. One of the reasons is that there were not nearly that many advanced concepts that explaining necessary; they did not exist.
michaelrozar17 just posted a link to a 12 c doc to refute my statement that the article you used was bad. No problem. Maybe this doc has been published because of these lines:
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The authors mean that a single scan is ONLY performed for these conditions? We do not know. There could be several reasons that an INLIST ITERATOR has not been included in this list:
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2. the authors were not aware that the CBO may also consider a unique analysis for a predicate INLIST
3. the authors WERE aware but forgot to include INLIST in the document
4. the authors were simply provide the conditions most common where a single sweep would be considered
We have no way of knowing what was the real reason. This does not mean that the document is not reliable.
In the other topic, I posted on the analysis of hard steps, site of BURLESON, and Jonathan contradicted me. If neither Burleson isn't reliable, do not know which author have sufficient credibility... of course, the two Burleson and Jonathan can say anything, it's true I can say anything, of course.
If site X is false, site is fake, Z site is fake... all people should read the documentation only and not other sites?
This is the BEST statement of reality to find the info I've seen displayed.
No matter who is the author, and what credibility that they could rely on the spent items you should ALWAYS keep these statements you comes to mind.
This means you need to do ' trust and verify. " You of 'trust', and then you "checked" and now have a conflict between WORDS and REALITY.
On those which is correct. If your reality is correct, the documentation is wrong. Ok. If your reality is wrong, then you know why.
Except that nobody has posted ANY REALITY that shows that your reality is wrong. IMHO, the reason for this is because the CBO probably MUCH, done a LOT of things that are not documented and that are never explored because there is never no reason to spend time exploring other than of curiosity.
You have not presented ANY reason to think that you are really concerned that a single scan is used.
Back to your original question:
Thus, when using predicates in the list, why in my case Oracle used the unique scan on primary key column index? Because it wasn't a level playing field.
1. why not use a single sweep?
2. what you want Oracle to use instead? A full table scan? A scan of the index systematic range? An index skip scan? A Full Scan index? An analysis of index full?
A full table scan? For three key values? When there is a unique index? I hope not.
A scan of the index systematic range? Look a the doc 12 c provided for those other types of indexes
How the Index range scans work
In general, the process is as follows:
- Read the root block.
- Read the bundle branch block.
- Replacing the following steps until all data is retrieved:
Read a block of sheets to get a rowid.
- Read a block to retrieve a table row.
. . .
For example, to analyze the index, the database moves backward or forward through the pads of sheets. For example, an analysis of identifications between 20 and 40 locates the first sheet block that has the lowest value of key that is 20 or more. The analysis produced horizontally through the linked list nodes until it finds a value greater than 40 and then stops.If that '20' was the FIRST index value and the '40' was the LAST one who reads ALL of the terminal nodes. That doesn't look good for me.
How to index full scans of work
The database reads the root block and then sailed on the side of the index (right or left hand if do a descending full scan) until it reaches a block of sheets. The database then reads down the index, one block at a time, in a sorted order. The analysis uses single e/s rather than I/O diluvium.
Which is about as the last example is not?
How to index Fast Full Scans work
The database uses diluvium I/O to read the root block and all the blocks of leaf and branch. Databases don't know branch blocks and the root and reads the index on blocks of leaves entries.
Seems not much better than the last one for your use case.
Skip index scans
An index skip scan occurs when the first column of a composite index is "skipped" or not specified in the query.
. . .
How Index Skip scan work
An index skip scan logically divides a composite index in smaller subindex. The number of distinct values in the main columns of the index determines the number of logical subindex. The more the number, the less logical subindex, the optimizer should create, and becomes the most effective analysis. The scan reads each logical index separately and "jumps" index blocks that do not meet the condition of filter on the column no leader.
Which does not apply to your use cases; you do not have a composite index, and there is nothing to jump. If Oracle were to 'jump' between the values of the list in it would be still reads these blocks 'inbetween' and them to jump.
Which brings back us to the using a single scan, one at a time, for each of the values in the list in. The root index block will be in the cache after the first value lies, so it only needs to be read once. After that just Oracle detects that the entry of only ONE necessary index. Sounds better than any other variants for me if you are only dealing with a small number of values in the IN clause.
- A query predicate refers to all columns in a unique index using an equality operator key, such as
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See EQUALS_PATH (and UNDER_PATH) conditions: http://docs.oracle.com/cd/B19306_01/server.102/b14200/conditions010.htm#i1051094
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I tried to add an index unique explicit to the table, but he changed the name (adds "v1") when I leave the table editor:CREATE UNIQUE INDEX MYTABLE_PKX ON MYTABLE(...); ALTER TABLE MYTABLE ADD CONSTRAINT MYTABLE_PK PRIMARY KEY(...);
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Issues related to the:
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The Production data release model 3.1 has been updated to allow constraints unique and primary and their indexes share the same name.
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Published by: Vaibhav on November 7, 2011 05:35The BTree index certainly can and are frequently used when values are not unique (e.g. are duplicated).
uniqueness isn't the issue. The relative number of distinct values (relative to the total number of lines) is important. An advantage of BitMap index BTree indexes, it's that BTree indexes can be composite - made up of multiple columns.
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http://download.Oracle.com/docs/CD/E11882_01/server.112/e25789/indexiot.htm#CBBECABB
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