Indexing question

Similar Questions

• Materialized view index questions...

  Hi all..
  
  
  I created a view "" REFRESH FAST' "materialized on a '' remote database table' ' that has 100 million records.
  Previously, I have a query that joins the local_db table and the remote_table via db_link.
  After I created the MV, I use MV to joing in this query.
  
  
  
  (1) the performance of the query has not much changed after I used MV. I was in the impression that the MV remains locally
  and improves the peformace. What can I do?
  
  (2) I intend to create indexes on the MV. It improves performance?
  Should I drop and create the MV, if I create indexes on it?
  I don't want to drop and create the MV all the time. Are there other options I have?
  
  
  EXPLAIN THE PLAN WITH MV:
  ====================

  SELECT STATEMENT, GOAL = ALL_ROWS      198190  45  2070
   FILTER          
    SORT AGGREGATE        1  23
     TABLE ACCESS BY INDEX ROWID  VP_OWNER  VIOLATORS  4  1  23
      INDEX RANGE SCAN  VP_OWNER  VLR_PLATE  3  1  
   HASH GROUP BY      198190  45  2070
    VIEW  SNALLADB    198189  45  2070
     HASH UNIQUE      198189  45  7245
      WINDOW SORT      198189  45  7245
       HASH JOIN OUTER      198187  45  7245
        PARTITION RANGE SINGLE      4520  44  6028
         TABLE ACCESS FULL  VP_OWNER  VIOLATIONS  4520  44  6028
        MAT_VIEW ACCESS FULL  VP_OWNER  PLATES_MV  193637  8310922  199462128

  EXPLAIN THE PLAN WITH JOIN THE REMOTE TABLE:
  ==========================================
  

  SELECT STATEMENT, GOAL = ALL_ROWS      4699  44  2024
   FILTER          
    SORT AGGREGATE        1  23
     TABLE ACCESS BY INDEX ROWID  VP_OWNER  VIOLATORS  4  1  23
      INDEX RANGE SCAN  VP_OWNER  VLR_PLATE  3  1  
   HASH GROUP BY      4699  44  2024
    VIEW  SNALLADB    4698  44  2024
     HASH UNIQUE      4698  44  7348
      WINDOW SORT      4698  44  7348
       NESTED LOOPS OUTER      4696  44  7348
        PARTITION RANGE SINGLE      4520  44  6028
         TABLE ACCESS FULL  VP_OWNER  VIOLATIONS  4520  44  6028
        REMOTE    PLATES  4  1  30

  QUERY:
  =====
  

   
   select viol_date, dmv_sts, lane_id, count(1) cnt, sum(rev) revenue
     from (select violation_id,
                  trunc(viol_date) viol_date,
                  lane_id,
                  rev,
                  'LP-' || (case
                    when dmv_sts in ('NDMV', 'NV-TIME') then
                     dmv_sts
                    when exists (select count(1)
                            from violators vr
                           where vr.lic_plate_nbr = vt.lic_plate_nbr
                             and vr.lic_plate_state = vt.lic_plate_state
                             and vt.viol_date between vr.usage_begin_date and
                                 nvl(vr.usage_end_date, sysdate)
                           having count(1) > 1) then
                     'M-VLTR'
                    else
                     'OTHER'
                  end) dmv_sts,
                  business_type
             from (SELECT DISTINCT v.violation_id,
                                   v.viol_date,
                                   v.lane_id,
                                   v.toll_due rev,
                                   v.lic_plate_nbr,
                                   v.lic_plate_state,
                                   DECODE(v.origin_type,
                                          'F',
                                          'Z',
                                          v.origin_type) business_type,
                                   MIN(case
                                         when p.lic_plate_nbr is null THEN
                                          'NDMV'
                                         when p.start_date is not null and
                                              v.viol_date between p.start_date and
                                              nvl(p.end_date, sysdate) THEN
                                          'IN-DMV'
                                         ELSE
                                          'NV-TIME'
                                       end) over(PARTITION BY violation_id) dmv_sts
                     FROM violations v
                     LEFT OUTER JOIN --plates@home_dmv.world
                   vp_owner.plates_mv p -- *** I am using the MV over there
                       ON v.lic_plate_nbr = p.lic_plate_nbr
                      AND v.lic_plate_state = p.lic_plate_state
                    WHERE v.viol_date >= to_date('7/5/2007', 'MM/DD/YYYY')
                      AND v.viol_date < to_date('7/31/2007', 'MM/DD/YYYY') + 1
                      AND v.viol_status IN ('ZH', 'WJ', 'A')
                      and v.violator_id is null 
                      and v.lic_plate_state = 'TX') vt)
    group by viol_date, dmv_sts, lane_id, business_type

  Thank you

  You have posted more than enough times to know that you will need to provide your Oracle version 4-digit.
  >
  (1) the performance of the query has not much changed after I used MV. I was in the impression that the MV remains locally
  and improves the peformace. What can I do?
  >
  Yes - drop the MV. Why did you create a MV if your tests showed that it did not provide an advantage?
  >
  (2) I intend to create indexes on the MV. It improves performance?
  Should I drop and create the MV, if I create indexes on it?
  I don't want to drop and create the MV all the time. Are there other options I have?
  >
  Why "do you plan to create indexes on the MV? Your statement in #1 said you that the MV will not provide any advantage.
  >
  Can someone help me please with this question...
  >
  What question? You have not presented any issue to help with.

  We must STOP focusing on a solution and return to determine what the problem or even if you have a problem.

  1. determine and document the existence of a problem.
  2. determine the cause of the problem
  3. identify possible solutions that will eliminate or alleviate the problem
  4. Select one or two options for further evaluation and testing
  5. implement your solution 'better '.

  You seem to be in step #5 but have not posted something that indicates you did steps 1-4.

  Display detailed information on steps 1 and 2.

• the composite index question

  If I have to create a composite index, why should we put the most selective column first?
  
  Suppose I have a table T that has columns C1, C2, C3, C4...
  Suppose I have a composite index on C1, C2 and my queries always contain the C1 and C2 in the WHERE clause.
  
  Suppose that C1 is more selective than C2.
  
  Why should the order of 2 columns in the index, C1, C2 and C2, C1?
  
  Is not the same height?
  
  Or oracle is able to store the values of C2 directly inside the leaves, save a branch?

  Claire wrote:
  If I have to create a composite index, why should we put the most selective column first?

  Suppose I have a table T that has columns C1, C2, C3, C4...
  Suppose I have a composite index on C1, C2 and my queries always contain the C1 and C2 in the WHERE clause.

  Suppose that C1 is more selective than C2.

  Why should the order of 2 columns in the index, C1, C2 and C2, C1?

  Is not the same height?

  Or oracle is able to store the values of C2 directly inside the leaves, save a branch?

  The order of the columns can make a difference.

  Select * from T where C1 =: C1 and C2 =: C2;
  Select * from T where C1 =: C1;

  In above cases if you have a composite index as C1, C2 then this index would be better.

  And

  Select * from T where C2 =: C2 and C1 =: C1;
  Select * from T where C2 =: C2;

  Thus, the order of the columns in your index depends on HOW YOUR QUERIES are written. Nothing
  another (selectivity of a or b are not at all)

  Source - the author himself. http://asktom.Oracle.com/pls/asktom/f?p=100:11:0:P11_QUESTION_ID:5671539468597

• SQLite indexing question

  Gidday

  I was wondering, set index updated automatically when you insert data, or y at - it a command, you need to add to get updated?

  In addition, are index required for ORDER BY statements to work effectively?

  I use ORDERBY to sort the results of selection of SQLite before adding them to my datagrid, but the result is not what I expected.

  -J' I add a lot of data in my database

  -J' I add a second batch

  When I say 'DECREE OF col3, col4' in my select query, col3 that DataGrid displays all records 'A' of the first batch of, then all batches of second and so on in the entire alphabet, instead of ALL a records mixed (but in the order)

  My index finger is a SINGLE a (col2, col3 and col4) to avoid duplication when in bulk insertion.

  I also have two indices-the two plain - col3 and col4?

  Bravo guys

  Indexing is used only to speed up your search.  It should not affect the research (or command).

• Another key or a function Index Question

  Hello
  
  I have the following sample tables:
  CREATE THE TABLE1 TABLE:
  (
  NUMBER OF RESOURCE_KEY
  CONSTRAINT TABLE_PK
  KEY ELEMENTARY SCHOOL
  (RESOURCE_KEY)
  )
  /
  CREATE THE TABLE2 TABLE
  (
  RESOURCE2_KEY INTEGER NOT NULL,
  RESOURCE1_KEY INTEGER NOT NULL,
  CONSTRAINT TABLE2_PK
  UNIQUE (RESOURCE2_KEY, RESOURCE1_KEY)
  USING INDEX
  TABLESPACE TRACERT_DATA,
  CONSTRAINT TABLE1_FK1
  FOREIGN KEY (RESOURCE1_KEY)
  REFERENCES TABLE1 (RESOURCE_KEY)
  ON DELETE CASCADE,
  CONSTRAINT TABLE1_FK2
  FOREIGN KEY (RESOURCE2_KEY)
  REFERENCES TABLE1 (RESOURCE_KEY)
  ON DELETE CASCADE
  )
  /
  Insert into TABLE1
  (RESOURCE_KEY)
  Values
  (1) ;
  Insert into TABLE1
  (RESOURCE_KEY)
  Values
  (2) ;
  COMMIT;
  
  
  Now comes the tricky part. I want only one of the following inserts to work:
  Insert into TABLE2
  (RESOURCE2_KEY, RESOURCE1_KEY)
  Values
  (1, 2);
  Insert into TABLE2
  (RESOURCE2_KEY, RESOURCE1_KEY)
  Values
  (2: 1);
  COMMIT;
  
  
  Any suggestions?

  You can use a single function index based.

  SQL> create table t (x number, y number);
  
  Table created.
  
  SQL> create unique index t_idx on t (greatest(x, y), least(x,y));
  
  Index created.
  
  SQL> insert into t values (2, 1);
  
  1 row created.
  
  SQL> insert into t values (1, 2);
  insert into t values (1, 2)
  *
  ERROR at line 1:
  ORA-00001: unique constraint (TEST.T_IDX) violated
  
  SQL> rollback;
  
  Rollback complete.
  
  SQL> insert into t values (1, 2);
  
  1 row created.
  
  SQL> insert into t values (2, 1);
  insert into t values (2, 1)
  *
  ERROR at line 1:
  ORA-00001: unique constraint (TEST.T_IDX) violated
  

• Indexing - transfer of page numbers

  Indexing question

  After having a terrible time of indexing of a book.

  I do not use the indexing InDesign feature because it requires knowing the structure of the index as we create the book. Without object in the structure of this book.

  Background: book see: 29 chapters, 490 pages. Running an iMac on OS 10.6, using InDesign CS 5.

  In the menus of the book 'Book Page number Options' is set at: order of pages i), continue from previous document.

  In the drop down menu layout the numbering and Section Options, are set to: automatically update Page and Section numbers, the "New article" the automatic Page Numbering box is checked.

  These are the settings under which I wrote the book. Has not had a problem with page numbers 'exploitation '.

  Question: Now for some reason any page numbers are not "stable". For example, this morning when I resumed indexing Ch. 12 had numbers page 125-162 and Ch, 13 had page numbers 161-176. It took some time to convince InDesign started by Ch. 13 on page 163.

  I can't keep the re-indexing. Almost out of resources. Guess I have something wrong in the page number for the indexing selections?

  For any help... Thank you

  Thomas

  Looking for a small triangle at the top of the page that starts the renumbering.  Double click on it will bring up the issues of dialogue and Sections.

  

• Instruments of the sample of user-specific does not see EXS24

  Logic Pro X 10.2.0 EXS24 sees the Instruments of the sample in my folder/library specific to the user, but only those in the global folder/library.

  But Logic Pro 9.1.8 EXS24 can see both.

  Background:

  I had my mid-2010 27 "iMac running OS X 10.8.5 and Logic Pro 9.1.8 (as well as Logic Studio 7) I upgraded to El Capitan without incident. I bought and installed Logic Pro X on the App Store without incident.

  The menu of Logic Pro X EXS24 instruments shows that the Instruments that are in the global folder:

  Instruments of Macintosh/Library/Application Support/logic/Sampler

  The menu Logic Pro 9 EXS24 instrument shows the Instruments that are in both aggregate AND user-specific folders.

  The menu instrument show the structure of:

  Instruments of Macintosh/Users/me/Library/Application Support/logic/Sampler

  It adds an entry listed as 'Factory' under which it places the Instruments found in:

  Macintosh/Library/Application Support/logic/Sampler instruments.

  If I load a project in Logic Pro 9 that uses some of the Instruments found in the user-specific directory in Logic Pro X, Logic Pro X reports errors that he cannot find the instruments and gives no possibility to 'find' and opens the project with a bunch of sounds of the sinusoid default loaded instead of the missing instruments.

  You can see two directories with the Global Directory on the specific to the user on the right and the left in my attachments.

  I have also attached a picture of the EXS24 Instrument Menu in Logic Pro 9 and Logic Pro X.

  Any guidance would be greatly appreciated.

  Thanks in advance!

  Here is the Menu of EXS24 Instrument under 9.1.8

  

  Here's the EXS24 Instrument menu under 10.2.0

  

  Here is a comparison of the Global Sampler Instruments on the left directory and Sampler Instruments menu specific to the user on the right

  (The view is provided by PathFinder rather than Finder which allows the sidebyside view)

  

  1. it is always useful to search the existing threads here at discussions.apple.com. Try some different keywords, and you can often find other people with similar problems.

  2 check out this thread. I had a similar problem and solved, answered my own question.

  X - Exs24 folder 'instruments' lacks logic

  3 re-indexing loops Apple Loops * should * help to find the folder. Here is some info on this:

  Logic Pro X index no loops.

  4. you can also try simply to drag the folder (in your Finder) and a session logical X. This * should * the entire folder to the index for you.

  5. you can always move the folders in your ~/Library (user) indexing question in your corresponding library/library/library indexing (root) folder.

• File is not seen in the folder, but there is in the system

  Hello

  I have a problem here:
  I am not able to see a file in the folder of excel when I arranged it other than the display of the name, only I'm able to see this file for name and not when it arranged type, modified, seen to date.
  If I copy the same file in another folder, this time, I am able to see when I arranged all the views.
  The solution I did was copied the file, delete the file and pasted in the same folder and then it worked.
  Please let me know the fix, so that I should not face the same problem in the future. Grateful if someone can support me.
  Thank you
  Sandesh

  Hi Sandesh,

  It could be a virus or a corrupt file indexing question.

  To make sure that your computer is virus-free, we will perform a complete analysis using the Microsoft Safety Scanner.

  Refer to this link:

  http://www.Microsoft.com/security/scanner/en-us/default.aspx

  Note: The data files that are infected must be cleaned only by removing the file completely, which means that there is a risk of data loss.

  I hope that the problem is solved and if you experience the same problem, answer here and we are happy to help you.

• Question indexing and backup...

  Couple questions.

  1 indexing - I created a directory "backup" off the rooy on my device via the file browser. Even with the pictures etc..., it's the area that I intend to backup just things, documents, programs, etc... To my surprise, images in this directory is indexed and illustrated with photos. Is this by design? In any case stop as long as these are usually the images that go with the product installs.

  2. I noticed in the backup agent it refers to \\myhubname\backup but that folder does not exist (this is why I created it). "However, on this backup operation (the one that installs by default), it stores data to \\myhubname\import\"directory file names "... strange.

  Any thoughts would be appreciated.

  Thank you.

  udflyer

  1. Yes, it's by design. Nothing in the files of importation or the media is indexed. I suggest using the backup folder.

  2. strange that the backup folder was not there. It is a default action.

• Too much PC freezes for streaming video / BSOP / profile user questions / WIN Update fails / Slow Indexing

  Win 7 crashing a lot during (online) video streaming for a while now > cannot read properties of Mem (RAM) in ' computer > Properties / group policy fails > can not change the type of user account

  HM-built PC:

  F2a - 84 M Asus MB

  Win 7 Home Premium

  ACPI x 64-bit

  AMD A4 - 5300 APU x 2

  16 GB of RAM DDR3 1333 MHz (4x4Go Patriot PSD38G1333KH)

  Graphic OB (Radeon HD Graphics (7480D)

  Internet:

  DSL ATT Uverse (6dwn/1up) Mbps

  Browsers:

  Chrome or Firefox (current)

  Security:

  OS = MS Security Essentials (Virus Defs = current)

  PC = MalwareBytes Anti-Malware

  Browser = MalwareBytes anti-Exploit

  General = system starts and works well, most of the time, but crashes at random, usually in streaming video, but other times, as well

  Win Update = Error Msg: "impossible to verify updates because no service not running - restart (does not help)." However, the VICTORY seems to automatically update very well (he just did this week).

  PC freezes = while watching NetFlix, other software streaming services (IE FXCM trading station)

  Indexing = sometimes, computer is very slow to scan (index?) drive / content folder

  Other = I do not know how to read the error or the event logs, the and al., so does not (see below). DSL ATT Uverse Speedtest / test line out above marks paid for. I don't know what "MS fix utility" to try (IE test of memory). C: drive is 3 GB to 500 GB full so cannot move to WIN 10 (maybe it is?) I'm lost...

  What else I can share to help?

  -Thanks, MC

  Hello

  Thanks for posting your question on the Microsoft community.

  Thank you for details on the issue.

  Windows may freeze if multiple programs are running at the same time or if Windows is infected by a virus or malware.

  I suggest you to execute the resolution of performance issues and check if that helps.
  Reference:
  Open the troubleshooter of Performance
  http://Windows.Microsoft.com/en-us/Windows7/open-the-performance-Troubleshooter

  It checks issues that could slow down the performance of your computer, such as how many users is currently connected to the computer and if multiple programs are running at the same time.

  Please also run Microsoft safety scanner to check and remove any viruses or malware that may cause the problem.
  Reference:
  Microsoft safety scanner
  http://www.Microsoft.com/security/scanner/en-us/default.aspx

  Note: The data files that are infected must be cleaned only by removing the file completely, which means that there is a risk of data loss.

  I hope this information helps.

  Please let us know if you need more help.

  Thank you

• Question of function-based Index

  Hello Experts,

  I am wondering something simple relating to the funcion according to index. Lets say I have a FBI something like the following.

  CREATE INDEX idx my_fbi ON my_table (substr (nls_lower (my_column),1 25));

  Maybe it's a very basic question, but SERIOUSLY, I want to know. My question is, when I use this index, including the rating should I use other side of the equal sign? and WHY?

  SELECT * FROM my_table WHERE substr (nls_lower (my_column),1 25( ) = 'ali';

  OR

  SELECT * FROM my_table WHERE substr (nls_lower (my_column),1 25) = substr (nls_lower ("ali"),1 25( );

  Thank you 1 million for your great comments.

  Best regards

  Charlie

  using value once the '=' sign would be more effective if you already know the value because in this case Oracle does not need to evaluate the expression, but if the values are not known, then you have to use the expression.

  Exact values are more efficient than expressions, especially when the expression is already evaluated and it must be evaluated at run time.

  Onkar

• Question of indexation UCM

  Hello

  I'm relatively new to the AAU so please excuse my question if it's very basic.

  I want to rebuild the full index on the content. The problem is that I have 10% (approximately) 20 GB free out available 200 GB) of free space on the disk where content is stored and I fear that runs the full it will cause disk space be fully occupied until it completes successfully. I know that the index is stored in the tables in the DB (DB has enough space), but I wonder if she will write all the files in the folder content and reduce the free space by a drawing of lots, or even completely occupy?

  Also, can you please tell me how long would take indexing after as I start running it (approximately)? (I have about 40 GB of content)

  Thanks in advance for your answer.

  I'd be a little concerned about the amount of available disk space, depending on your current configuration.

  • If you are currently storing content in folders on the file system, it can not also be an issue from a perspective of indexing.
  • If you store content in the database however, content server will need to out the content on the file system in order to perform content indexing.  Having to write content on the disc is where you might have problems.

  How long will it take?  There is no formula regarding how long x amount of content will not.  It only depends on the types of files themselves and the complexity of the content in the documents being indexed.  40 GB of JPEG files will end very quickly, because these files have no text to index.  40 GB of several sheets workbooks Excel with thousands of lines and columns of numeric data may take some time.  The system must extract the textual components of each file, write the text that it finds in a txt by each content element file, and then the content of this txt file is passed to the search index.

• stupid question: back in terms of index rebuild...

  I know this will sound like a stupid question and perhaps I should change my alias dumb-dba, but I think that this name is already taken... HA, ha... :-)
  
  I'm on a site that has very strict and even change management rules run a job to rebuild indexes requires a request for change and a plan to uninstall.
  
  I'm under Oracle 11 g EE (not that this is important).
  
  No idea what to ask for "Uninstalling Plan"?
  
  As far as I know, only uninstalling would enter Ctrl-C when rebuilding the index and Oracle would automatically return to the initial index.
  Alternatively, if something crazy that happened and that the index hit the corrupt blocks or something, just rebuild again.
  
  Any other ideas?

  user12159859 wrote:

  No idea what to ask for "Uninstalling Plan"?

  I think it depends on what you're supposed to be back out of. I see two options:
  (1) the reconstruction it lasts too long and is a performance impact
  (2) the reconstruction is finished and seems to have caused a performance problem.

  In the first case, it seems appropriate to kill the session (if possible on your platform).

  In the second case, you're a little stuck - however, there are two possibilities to consider: check the index before statistics of the rebuild and to write their return after the reconstruction, in which case it is the change in the stats which has introduced changes in the plans; Otherwise, make sure you know how much free space there is on average in each index leaf block before reconstruction and regeneration it again with pctfree is set to allow much space free after reconstruction - if it was only the change in the use of block that caused a problem of competition which may help - you might want to develop an initrans adapted at the same time.

  Concerning
  Jonathan Lewis

• question about indexing settings

  Hello
  
  I was looking through the release of Essbase and here's my question about the index file I deleted a populous cube and I see everthing reset to 0 except index Cache current value that remained the same when the cube is populated.
  
  Any help or a response in this regard is greately appericiated.
  
  Thank you

  No, it should not change to zero. As I said, the key cache takes the memory when the application starts and keeps it until the application is stopped even if there are no data in the cube. HE maintains that the memory for when there no are data. I've seen of many inplementations where the client has set the cache to be really fat git thought would only use what it takes, but instead, the amout set gets consumed. So, I'm called asking how they can possibly be out of memory on their server. Moral of the story, do no bigger that it must really be or you will expect a lot of the key cache memory

• Question about the use of secondary indexes in application

  Hi, I'm a newbie to Berkeley DB. We use Berkeley DB for our application that has tables in the following structure.
  
  Key to value1 value2
  ------- --------- ----------
  1) E_ID-> E_Attr, A_ID - where A_ID is String for example. A_ID = A1; A2; A3
  -where E_ID is unique but for example A1 or A2 may be part of multiple F_VITA say E1, E3, E5 etc.
  
  
  So my question is that it is possible to create secondary indexes on individual items of Value2 (e.g., A1, A2 or A3)?
  
  
  Another question, lets say we have two tables
  
  Key to value1 value2
  ------- --------- ----------
  2) X_ID-> X_Attr, E_ID
  
  E_ID-> E_Attr, A_ID - where A_ID is String for example. A_ID = A1; A2; A3
  
  In this case, can create us E_ID as a secondary Index but with primary Table-> E_Attr, A_ID E_ID?
  
  While X_ID given, we can get the chronogram, E_ID-> E_Attr, table allocation A_ID?
  
  Don't know if its possible.
  
  Thanks for reading.

  (1) when talking about data & Index, I was referring to READ ONLY BDB with no. UPDATES where you download entire files allows for example on a weekly basis. In this case, I believe that the data will be stored directly in the tree. It will not be stored in the transaction as such logs. This hypothesis is correct?

  # Storage I is nothing other than a transaction log. Read the white paper, that I mentioned.

  (2) and about the Garbage Collection operation, I meant BDB 'Cache éviction' algorithms. Sorry I have not communicated before.

  I use an LRU algorithm. What do you need exactly to know, that you can not get the doc?

  -mark