Text :: Advanced Compression And Oracle Tables / Indexes
Sep 11, 2012
I have noticed that Oracle text related objects, particularily the $I tables are some of the largest objects in our database. I have been actively pursuing utilizing Oracle advanced compression in our databases for OLTP table compression and LOB object compression. I have been unable to find any documentation or notes on if it is advisable to implement either table OLTP or LOB compression for Oracle text objects.
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Aug 8, 2012
Hybrid Columnar Compression is dependent on the underlying storage system. See Oracle Database Licensing Information for more information.
The below is from the Oracle® Database PL/SQL Packages and Types Reference
Compression Constant Compression Level Description
COMP_FOR_OLTP 2 OLTP compression
COMP_FOR_QUERY_HIGH 4 High compression level for query operations
COMP_FOR_QUERY_LOW 8 Low compression level for query operations
COMP_FOR_ARCHIVE_HIGH 16 High compression level for archive operations
COMP_FOR_ARCHIVE_LOW 32 Low compression level for archive operations
To use Compression Level 4 or higher do we have to have ZFS or Pillar storage ?
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Aug 18, 2010
How does standard vs advanced handle index compression? Is there an advantage to having one vs the other besides the incurred cost?
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Sep 17, 2013
I am on Oracle 11.2.0.3 on Linux and have implemented Oracle Text.I created Oracle Text indexes with default setting. However in an oracle white paper I read that the default setting may not be right. Here is the excerpt from the white paper by Roger Ford:URL....(Part of this white paper below....)Index Memory.
As mentioned above, cached $I entries are flushed to disk each time the indexing memory is exhausted. The default index memory at installation is a mere 12MB, which is very low. Users can specify up to 50MB at index creation time, but this is still pretty low. This would be done by a CREATE INDEX statement something like: CREATE INDEX myindex ON mytable(mycol) INDEXTYPE IS ctxsys.context PARAMETERS ('index memory 50M'); Allow index memory settings above 50MB, the CTXSYS user must first increase the value of the MAX_INDEX_MEMORY parameter, like this: begin ctx_ adm. set_ parameter('max_index_memory', '500M'); end; The setting for index memory should never be so high as to cause paging, as this will have a serious effect on indexing speed. On smaller dedicated systems, it is sometimes advantageous to temporarily decrease the amount of memory consumed by the Oracle SGA (for example by decreasing DB_CACHE_SIZE and/or SHARED_POOL_SIZE) during the index creation process.
Once the index has been created, the SGA size can be increased again to improve query performance." (End here from the white paper excerpt)My question is:
1) To apply this procedure (ctx_adm.set_parameter) required me to login as CTXSYS user. Is that right? or can it be avoided and be done from the application schema? This user CTXSYS is locked by default and I had to unlock it. Is that ok to do in production?
2) What is the value that I should use for the max_index_memory should it be 500 mb - my SGA is 2 GB in Dev/ QA and 3GB in production. Also in the index creation what is the value I should set for index memory parameter - I had left that at default but how should I change now? Should it be 50MB as shown in example above?
3) The white paper also refer to rebuilding an index at some interval like once in a month: ALTER INDEX DR$index_name$X REBUILD ONLINE; We are on Oracle 11g and the white paper was written in 2003.
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Jun 9, 2010
I am researching a performance problem on an Oracle Preprd DB in a RAC cluster using AQ. The queue table has 88 records, is about 900Meg in size, takes 90+ seconds to do a select count(*). In Prod the same table is about 44 records, 80 Meg in size, and takes about 9 seconds to query the table. The DB is at 10.2.0.4 running on a LINUX/Sun host. In the USER_DATA column I am seeing an entry in the STR_VALUE that displays 'Unable to successfully deliver a message after "MaxDeliveryCnt" attempts. Please verify that the onMessage() method of the MDB does not throw a RuntimeException' for each record in the table. I don't have direct access to the PROD DB so I can not verify this message in that environment. My question, is this table holding onto records that should be cleared out and should this table be dropped and rebuilt to reduce its size. I have seen this technique improve performance for other non-queueing tables. But I don't know if this is possible with a queue table.
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Sep 2, 2012
I am trying to enable OLTP compression on tables and at tablespace level for the tables
Steps I am following are:
1. Move indexes to its own tablespace
2. enable OLTP compression at table level:
alter table table_name move compress for OLTP
3. Rebuild indexes
4. Issue I have is what to do with tables with LOB columns
ALTER TABLE lob_table MOVE LOB (LOB_COL) STORE AS (TABLESPACE index_tbsp); -- Is this correct?
5. alter tablespace data_tablespace default compress for OLTP;
I have a question, is the sequence of steps correct. For tables with LOB columns do we needto move lobindex to index tablespace. Beacuse lobsegment and lobindex are created in data tablespace?
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Jul 22, 2012
I been doing a little testing with indexing the contents of URLs (database v11.2.x.x).
ctx_ddl.drop_preference('TEST_URL');
ctx_ddl.create_preference('TEST_URL','URL_DATASTORE');
ctx_ddl.set_attribute('TEST_URL','Timeout','3600');
create index datastores_text on test_url_search ( doc ) indextype is ctxsys.context parameters ( 'Datastore TEST_URL' );
SELECT SCORE(1),DOC from TEST_URL_SEARCH WHERE CONTAINS(DOC, 'London', 1) > 0
This works. i like to more
e.g. multi words search e.g. ' London Games' where if London or games are present it return a URL with a score,
or
Search in the Chinese.
The only way I can see to do this is create different indexes as the attributes for 'URL_DATASTORE' are limited. If I can what does the 'Contains' statement look like?
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Sep 20, 2012
I have Oracle Advanced Security installed on database:
SQL> set line 400
SQL> select NAME
*2 from DBA_FEATURE_USAGE_STATISTICS*
*3 WHERE name IN ('Advanced Security')*
*4 /*
NAME
------------------------------------------------------
Advanced Security
Advanced Security
I need to uninstall this option, how to uninstall oracle advanced security ?
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Apr 7, 2010
I want to know whether OAS(oracle advanced security) is enabled in our database or not?
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Dec 13, 2012
Does size (number of rows) of table and corresponding indexes have influence on INSERT operations (bigger table - slower insert)?
I supposed that if select returns the same rows in small and big table, there will be no difference in performance?
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Jul 21, 2012
I know that truncate is a ddl operation that removes all the data from the table and set the HWM to very beginning. I am curious to know, is anyhow indexes will be affected on the issuance of truncate command or we need to rebuild the indexes after issuing truncate.
Also is there any way to know that how many rows/blocks a select statement is scanning because of the effect of HWM even the table has 0 rows.
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Jun 19, 2012
i am using oracle 10g. is there a way to find out the over fragmented tables/indexes ,so that reorganizing or rebuilding them will improve sql performajnce?
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Jan 12, 2011
So our situation is pretty simple. We have 3 tables.
A, B and C
the model is A->>B->>C
Currently A, B and C are range partitioned on a key created_date however it's typical that only C is every qualfied with created date. There is a foreign key from B -> A and C -> Bhave many queries where the data is identified by state that is indexed currently non partitioned on columns in A ... there are also indexes on the foreign keys that get from C -> B -> A. Again these are non partitioned indexes at this time.
It is typical that we qualifier A on either account or user or both. There are indexes (non partitioned on these) We have a problem with now because many of the queries use leading wildcards ie. account like '%ACCOUNT' etc. This often results in large full table scans. Our solution has been to remove the leading wildcard.
We are wondering how we can benefit from partitioning and or sub partitioning table A. since it's partitioned on created_date but rarely qualified by that. We are also wondering where and how we can benefit from either global partitioned index or local partitioned indexes on tables A. We suspect that the index on the foreign key from C to B could be a local partitioned index.
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Mar 6, 2013
I have one control table as below.I want to rebuild all indexes for the tables in control table.
The control table is having the following data.
SEQ_IDTABLENAME SCHEMA_NAME
1GEDIS_ORDER_FORM_STATES ALL
2GEDIS_NOTES ALL
3GEDIS_CARD_TYPE_AUDIT APRT
4FAX_HEADER OMS
In the control_table schema_name "ALL" means this is for 30 schemas(The table is existed in 30 schemas).Except for schema_name "ALL" ,the table is existed in the particular schema(The table is existed in the only one schema).
I tried the following code it is executing for all 30 schemas(ALL).But it is not executing for specific schemas.
CREATE OR REPLACE PROCEDURE Rebuilding_index
IS
l_sql VARCHAR2(4000);
CURSOR cur_tab_schema
IS
SELECT tablename,schema_name
FROM control_table3;
[code]....
This contains the 30 schema names.
SELECT owner_name FROM global_bu_mapping;
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Sep 27, 2013
I have tried a lot by alternate solutions like rearranging the order of tables in join and moving where conditions before but no success...Its a bottleneck and I could not have indexes on these tables in production...I want to change the approach in subquery
SELECT
g.COLUMN1,
g.COLUMN2,
e.COLUMN3,
g.COLUMN4,
MIN(e.dat1) KEEP ( DENSE_RANK FIRST ORDER BY date2 Desc) * -1,
min(to_char(date3,'dd-mm-yyyy'))
[code]....
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Aug 8, 2012
I have created 3 tables and some indexes, but these objects do not show up in dba_segments view. Is this a normal behaviour? Previously, with dictionary managed tablespace, I can specify the minimum extent to create, when the table/index is created. But I'm not sure how the locally managed tablespace work.
I'm using Oracle 11g R2 (11.2.0.1.0) for Microsoft Windows (x64), running on Windows 7.For the purpose of reproducing this issue, I have created the tablespaces as follow:
CREATE TABLESPACE CUST_DATA
DATAFILE 'd:appasusoradataorcl11gr2CUST_DATA01.DBF' SIZE 512K
AUTOEXTEND ON NEXT 256K MAXSIZE 2000K
EXTENT MANAGEMENT LOCAL UNIFORM SIZE 256K
SEGMENT SPACE MANAGEMENT AUTO;
[code]...
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Oct 21, 2011
Whats the easiest way I can see a list of tablespaces and what tables and indexes are in those tablsespaces? Can this be done through OEM?
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Feb 4, 2005
16:28:32 SQL> create bitmap index bp_idx_ag_id on transactions(type);
create bitmap index bp_idx_ag_id on transactions(type)
*
ERROR at line 1:ORA-25122: Only LOCAL bitmap indexes are permitted on partitioned tables
how to create bitmap index on partitiioned tables
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Mar 25, 2013
We have started developing a new application to compress tablespaces based on the business specification.
This is a Data Warehouse.
Version: Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
And there is a requirement to find the uncompressed segments,to find whether the tablespace is already compressed or not.
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Nov 16, 2012
Using Oracle 11g's compression feature in production? I haven't read anything negative yet, that doesn't meant that there isn't anything that could have an adverse affect. I wanted to check to see if there are any affects on the performance or any disadvantages of using this compression feature. I have tested this on one my major tablespace and I did see a big difference in the reduce size on the tablespace but I am still hesitated to put this into production.
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Apr 5, 2012
Create small functional indexes for special cases in very large tables.
When there is a column having one values in 99% records and another values that have to be search for, it is possible to create an index using null value. Index will be small and the rebuild fast.
Example
create index vh_tst_decode_ind_if1 on vh_tst_decode_ind
(decode(S,'I','I',null),style)
It is possible to do index more selective when the key is updated and there are many records to create more levels in b-tree.
create index vh_tst_decode_ind_if3 on vh_tst_decode_ind
(decode(S,'I','I',null),
decode(S,'I',style,null)
)
To access the record can by like:
SQL> select --+ index(vh_tst_decode_ind_if3)
2 style ,count(*)
3 from vh_tst_decode_ind
4 where
5 decode(S,'I','I',null)='I'
6 group by style
7 ;
[code]....
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Oct 18, 2010
Is there any way to compress data while export in ORACLE 10g or if there is any other way I can reduce the space consumed by the datafiles.
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Feb 8, 2013
I have to enable oracle advance compression for existing table which PARTITION BY RANGE then SUBPARTITION BY HASH.
ORacle version: 11.2.0.2.0
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Dec 26, 2012
Any documentation supporting Oracle 11G and Advanced Security stating encryption at rest is FIPS 140-2 compliant?
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Jul 9, 2013
aix 6.111.2.0.3 I have an expdp dump from prod to be imported to our test database.I have imported it using impdp, but to my surprise the tables were imported but lots of indexes were not created? even If I have used TRANSFORM=SEGMENT_ATTRIBUTES:N just to use the default USERS tablespace. How do I import the indexes separately, skipping the tables and other objects?
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Jun 19, 2012
I'm new to Oracle Text. I want to implement search for the unique ids. Like google search when the user start typing 123 it need to brings anything starting with 123 and has show like entries how google will shows. When I add number 4 to like 1234 then it has bring numbers starting with 1234.
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Apr 29, 2008
Actually what i am trying to do is to extract data form tables and place them in an external text file....i wrote the following code
FUNCTION
create or replace
FUNCTION dump_data ( p_query in varchar2,
p_separator in varchar2 ,
[Code].....
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May 9, 2011
this is just a generic question. If a table has multiple Indexes on it say a table of 20 columns where 8 columns have indexes on it (each columns out of the 8 has an index on it and out of which three columns contain unique indexes on it).
If i run a query on this table where only two columns are specified in the where clause are the remaining 6 indexes on the table scanned during query execution.
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Sep 10, 2010
I have few BDs replicated using Advanced Replication, some tables are read only (Basic Replication) and another ones are Updatable (Advanced Replication).
The infraestucture is Materialized View Replication, my trouble is, I do not know how to should treat the updatable tables that have foreign keys, I read in another FAQs that you should replicate the indexes using the same way to replicate tables (dmbs_repcat.create_master_repobject)
Which is the correct manner to treat the foreign keys with this kind of updatable snapshots,
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Jul 12, 2012
How many different types of indexes we have in oracle?
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