How to rename database with secondary indexes.

Hi,
could somebody advise how to run correct next operation:
I have database with secondary indexes in a single file and I need to rename that db file.
As I understand I have to
1) close and delete all database handles
2) remove from db file all secondary indexes with DbEnv::dbremove
3) rename db file with DbEnv::dbrename
4) create primary db
5) create once again all secondary indexes and associate them with primary db
Appreciate in advance.

Hi,
Your question has two possible cases:
1. A single file contains main DB and its secondary indexes.
2. A file contains several secondary indexes of main DB, another file contains the main DB.
For the first case, the main database could be renamed directly, but all of the secondary databases do not continue to work. That means no new index items will be added automatically into exist secondary databases. So these secondary databases should be removed and created, you could also just run a DB->associate to re-associate it again. But in the later way, the re-associated secondary DB won't automatic index these records that are added before associating.
That means, if main db is renamed and then inserted a record 'A'. Then secondary DB is re-associated to main db. The secondary DB still does not index record 'A'. And currently there is not method to let secondary DB manually index 'A' again. So it is better to remove and create a new secondary DB with DB_CREATE flag. That will make the new secondary DB scan current items and index them.
For the second case, the result is the same, main database could be remained directly. Then all of the secondary databases should be re-created or re-associated. Still for the described reason, we prefer the first way.
And, removing old secondary databases before renaming main database is also work in above cases.
Thanks,
Victor Yang

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How to revert back of secondary indexes created?

Hi all,
I have craeted secondary indexes in development and they have been transported into quality and production. Some dumps are coming in the production because of these secondary indexes.
Please guide me how to revert back those secondary indexes from production(means to keep original with out that secondary indexes?)
Please give me solution.
Regards,
Lokesh

Hello,
The best way to do this is delete the indexes again in DEV and create a transport request.
Transport this request to QA and PRD and the index will be deleted.
Via SE14 you can also delete the index immed in PRD.
SE14 will only delete the index from the database (shortdumps will disappear then).
Afterwards you can still use SE11 to delete the index from the SAP repository as well.
Success.
Wim
Edited by: Wim Van den Wyngaert on Nov 20, 2009 1:08 PM

How does BDB update its secondary index?

I am asking how does Berkeley DB update its secondary index?
For example, in a BDB table with key value pair ``<k,v1>``, the index database would have reversed pair like ``<v1,k>``. Upon an insert (or essentially an update) ``<k,v2>``, base table record ``<k,v1>`` should be overwritten to ``<k,v2>``.
But how would BDB deal with ``<v1,k>`` in the index table? Will it delete it immediately?

Hi,
As long as you correctly open the primary database and secondary index database, and associate the secondary index database with the primary, any update on the primary database will be reflected in the secondary index.
For more information, please refer to Reference Guide for Berkeley DB -> Chapter 3. Access Method Operations -> Secondary Indexes section.
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hi,
i have a report which is giving performance issues on a perticular select query on KONH table.
the select query doesnt use the primary key fields and table already has around 19 million entries.So there was a secondary index created for the fields in the table.
now, KONH is a client specific table, and hence has MANDT as the first field. when the table is not indexed it is sorted according to the order of fields, like first MANDT, then primary key fields and then remaining fields.. (correct me if i am wrong)
but the secondary index created doesnt has MANDT in it..(yea, a mistake! )...
but instead of correccting the secondary index, i am told to change the select query..
so, i used a "client specific" syntax to sort the issue.. but i dont understand whre i should put the "where mandt eq sy-mandt" clause..
should i put it right after all my secondary index fields are over? or what happens to the order of fields which are not present in the list of secondary index?
kindaly help.
thanx.

Hi chinmay kulkarni,
its better if you can ask concerned person to add MANDT field in your index as well....
Indexes and MANDT
If a table begins with the mandt field, so should its indexes. If a table begins with mandt and an index doesn't, the optimizer might not use the index.
Remember, if you will, Open SQL's automatic client handling feature. When select * from ztxlfa1 where land1 = 'US' is executed, the actual SQL sent to the database is select * from ztxlfa1 where mandt = sy-mandt and land1 = 'US'. Sy-mandt contains the current logon client. When you select rows from a table using Open SQL, the system automatically adds sy-mandt to the where clause, which causes only those rows pertaining to the current logon client to be found.
When you create an index on a table containing mandt, therefore, you should also include mandt in the index. It should come first in the index, because it will always appear first in the generated SQL.
Index: Technical key of a database table.
Primary index: The primary index contains the key fields of the table and a pointer to the non-key fields of the table. The primary index is created automatically when the table is created in the database.
Secondary index: Additional indexes could be created considering the most frequently accessed dimensions of the table.
Structure of an Index
An index can be used to speed up the selection of data records from a table.
An index can be considered to be a copy of a database table reduced to certain fields. The data is stored in sorted form in this copy. This sorting permits fast access to the records of the table (for example using a binary search). Not all of the fields of the table are contained in the index. The index also contains a pointer from the index entry to the corresponding table entry to permit all the field contents to be read.
When creating indexes, please note that:
An index can only be used up to the last specified field in the selection! The fields which are specified in the WHERE clause for a large number of selections should be in the first position.
Only those fields whose values significantly restrict the amount of data are meaningful in an index.
When you change a data record of a table, you must adjust the index sorting. Tables whose contents are frequently changed therefore should not have too many indexes.
Make sure that the indexes on a table are as disjunctive as possible.
(That is they should contain as few fields in common as possible. If two indexes on a table have a large number of common fields, this could make it more difficult for the optimizer to choose the most selective index.)
For Example...
SELECT KUNNR KUNN2 INTO TABLE T_CUST_TERR
FROM KNVP CLIENT SPECIFIED
WHERE MANDT = SY-MANDT " here MANDT shd be first
AND KUNN2 IN S_TERR
AND PARVW LIKE 'Z%'.
Accessing tables using Indexes
The database optimizer decides which index on the table should be used by the database to access data records.
You must distinguish between the primary index and secondary indexes of a table. The primary index contains the key fields of the table. The primary index is automatically created in the database when the table is activated. If a large table is frequently accessed such that it is not possible to apply primary index sorting, you should create secondary indexes for the table.
The indexes on a table have a three-character index ID. '0' is reserved for the primary index. Customers can create their own indexes on SAP tables; their IDs must begin with Y or Z.
If the index fields have key function, i.e. they already uniquely identify each record of the table, an index can be called a unique index. This ensures that there are no duplicate index fields in the database.
When you define a secondary index in the ABAP Dictionary, you can specify whether it should be created on the database when it is activated. Some indexes only result in a gain in performance for certain database systems. You can therefore specify a list of database systems when you define an index. The index is then only created on the specified database systems when activated
Also pls have a look on below link
http://www.sapfans.com/sapfans/forum/devel/messages/30240.html
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Reward points if useful...
Thanks & Regards
ilesh 24x7

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I'd like to use partial inserts (DB_DBT_PARTIAL).
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When writing a partial record to the primary database, here's what we do:
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HI
How to create database with ASM?
I install vmware workstation on window XP .On virtual machine install Linux 5 enterprise (Oracle) install.
I install oracle DB software only. Also make 3 disk for ASM .
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How I can see disks ..
so I simple install oracle DB software only.
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Please guide me
Thanks

Hi
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How to rename database in oracle 8.0.5 unix?

how to rename database in oracle 8.0.5 unix? for example from 'DBDEV' to 'DBTEST'

Dear Amardeep,
The OP opened 2 threads, one how to clone and other one how to rename a database 8. The article I send show how to clone the DB (one of the steps in the clone article is how to rename the DB from"PROD" to "Test"). ;)
This is the other thread:
easy way to clone database
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Hi,
I have a cube that on the whole works very well, but periodically when I drill down to some characteristics it runs extremely slowly.
The cube is in a our Test environment and is not being updated with data.
When I go to RSA1[Select Cube] Manage>Performance, the DB indexes are now green after reactivating the cube and recreating the indexes.
Yet, when I drill down to certain characteristics, I can see in SM50 the query is doing a sequential read. It looks as if the secondary index on this dimension is not doing its job or being ignored.
I have tried Checking the Cube Database Indexes in RSRV and all is okay. The Master Data in the relevant dimension all seems to be active.
Any suggestions on how to get to the bottom of this would be much appreciated.
A trace on the SQL is showing the following statement taking excessive time:
Select * from RSDCHABAS where CHABASNM = ? and OBJVERS = ?.
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Regards
Adrian

Hi Adrian,
In BW we are while tranforming data from source system we are using this table to dump the data in table RSDCHABAS. Which is nothing but use as buffer.
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This will deffinately resolve this error.
Regards,
Mahesh

How to combine spatial and secondary index, when extracting?

Hi spatiallers,
vers.: (32 bit) Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production on Sun/SunOS 5.8 (64 bit)
In our DataWarehouse the table topo_geodata stores all topographic data in Denmark. The table has a spatial index (QT) on its SDO_geometry column named utm_geo as well as a primary key on the column topo_geo_id and 4 secondary indexes on other columns.
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Only when a pinpoint 1 particular value of the primary key do I get fast response. When pinpointing 1 value in a secondary index as in
select count(*) as antal1
from topo_geodata k, topo_geodata tg
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the performance deteriorates back to 4 min., and the queryplan shows some weird bitmap conversion followed by a bitmap-and operation.
- Thanks in advance,
Jens Ole Jensen
Kort & MatrikelStyrelsen (WWW: http://www.kms.dk)
Danmark

Hi Jens,
I'm not sure I understand the question, or what it is that works fast.
In this case, the SDO_RELATE with the anyinteract mask has to be done first.
If this takes 4 minutes, then adding additional criteria to reduce the amount of
data returned from that subset will only add time.
The spatial portion of the query has to be done using the spatial index, which is
a monolithic index for the whole table, so all of the geometry data has to be searched,
and the anyinteract applied to all of this data.
After that set of rows comes back, then the additional predicate is applied.
I'm not sure what this means:
Only when a pinpoint 1 particular value of the primary key do I get fast response. You do have a few options to try to make things work faster:
If queries included additional predicates on mtk_obj_id, you might try
to use range partitioning.
If the predicates on mtk_obj_id is very selective, then you might want to select
values based on that column, then use sdo_geom.relate between that very
small subset and the query window.
Hope this helps, and all is well with you.
Dan

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Hi Genies,
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Regards,
        Thangam.P

Hi Genies,
                Here i have created the Secondary index for table COEP and also used for select query but there is no improvement in runtime . taking same time for select query without index as well as with index. my code is
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             AND B~GJAHR = CURRY
             AND A~RBEST = ''
             AND A~BEKNZ = 'S'
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please any one let me know is there any syntax mistakes? but while checking and during the runtime it does'nt shows any error.
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How does OWB deal with bitmap indexes when inserting?

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Jaap.

Hai Japp,
It depends on the volume of the data.
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