Partitioning and Clustering of Table

I just inherited a table with 10 million discs. Data can be grouped against a key, every key with usually around 10-200 lines.

Given against this key gets dragged over a large period of time. The separate keys in this table at present are ~.7 million.

All our access to this table is based on this key. As you can image data are scattered in several blocks, so there is considerable I/O and it takes a long time for all queries to run. Ours can be described as instance Reporting however inserts and updates this table up-to-date produce 24/7 and access to the system is 24/7.

My question is threefold

Should I create a cluster from the unique table on that table with my key as the cluster column?

Partitioning coexist with clusters?

Other strategies exist to optimize in this case?

Thanks in advance

Daniel

If each key corresponds to 10-200 lines, however, and it is a regular b-tree on the key index, the fact that there are millions of rows in the table should be (mostly) not relevant - Oracle will get 10-200 ROWID of the index and 10-200 one-piece extractions. This should be pretty quick, so I'd be interested in why you think that this distribution is causing significant delays in reporting instance.

Are you a license for partitioning (it's an extra cost option on top of your enterprise edition license)? If you are partitioning table would seem reasonable. A cluster of the unique table or a table in index also seems to be reasonable. Cluster table, however, will slow down inserts and updates. However, you cannot partition a table cluster.

Justin

Tags: Database

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    *
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    SQL >

    If so, of the foreign key and recreate it pointing to the partitioned table as parent after finished partitioning the table.

    SY.

  • Find the right Partition for swap Partiton when there are PARTITION and SUBPARTITION

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        "EVOD_DARTI_ID" NUMBER(20,0) DEFAULT -1 NOT NULL ENABLE, 
        "EVOD_DCAMP_ID" NUMBER(20,0) DEFAULT -1 NOT NULL ENABLE, 
        "EVOD_DUSAG_ID" NUMBER(20,0) DEFAULT -1 NOT NULL ENABLE, 
        "EVOD_DOPSY_ID" NUMBER(20,0) DEFAULT -1 NOT NULL ENABLE, 
        "EVOD_DDEVI_ID" NUMBER(20,0) DEFAULT -1 NOT NULL ENABLE, 
        "EVOD_DSHOP_ID" NUMBER(20,0) DEFAULT -1 NOT NULL ENABLE, 
        "EVOD_DPLFO_ID" NUMBER(20,0) DEFAULT -1 NOT NULL ENABLE, 
        "EVOD_DACCO_ID" NUMBER(20,0) DEFAULT -1 NOT NULL ENABLE, 
        "EVOD_DDECL_ID" NUMBER(20,0) DEFAULT -1 NOT NULL ENABLE, 
        "EVOD_DOBJT_ID" NUMBER(20,0) DEFAULT -1 NOT NULL ENABLE, 
        "EVOD_DOFFR_ID" NUMBER(20,0) DEFAULT -1 NOT NULL ENABLE, 
        "EVOD_DCNTR_ID" NUMBER(20,0) DEFAULT -1 NOT NULL ENABLE, 
        "EVOD_DCURR_ID" NUMBER(20,0) DEFAULT -1 NOT NULL ENABLE, 
        "EVOD_DCONT_ID" NUMBER(20,0) DEFAULT -1 NOT NULL ENABLE, 
        "EVOD_DIVWC_ID" NUMBER(20,0) DEFAULT -1 NOT NULL ENABLE, 
        "DD_SUBSCRIPTION_ID" VARCHAR2(50 BYTE) DEFAULT '~' NOT NULL ENABLE, 
        "SINGLE_ISSUE" NUMBER(8,0) DEFAULT 0, 
        "SUBSCRIPTION" NUMBER(8,0) DEFAULT 0, 
        "RENEWAL" NUMBER(8,0) DEFAULT 0, 
        "CONVERSION" NUMBER(8,0) DEFAULT 0, 
        "DOWNLOAD" NUMBER(8,0) DEFAULT 0, 
        "UPDATES" NUMBER(8,0) DEFAULT 0, 
        "NET_VALUE_IN_EUR" NUMBER(10,4) DEFAULT 0 NOT NULL ENABLE, 
        "GROSS_VALUE_IN_EUR" NUMBER(10,4) DEFAULT 0 NOT NULL ENABLE, 
        "COMMISSION_IN_EUR" NUMBER(10,4) DEFAULT 0 NOT NULL ENABLE, 
        "TAX_IN_EUR" NUMBER(10,4) DEFAULT 0 NOT NULL ENABLE, 
        "POSITION_NR" NUMBER(3,0) DEFAULT -1, 
        "DD_ORDER_NR" VARCHAR2(50 BYTE) DEFAULT '~' NOT NULL ENABLE, 
        "EVOD_SOURCE_CD" VARCHAR2(50 BYTE) DEFAULT '~' NOT NULL ENABLE, 
        "FLAG_STOCK_RELEVANT" NUMBER(1,0) DEFAULT '0' NOT NULL ENABLE, 
        "RENEWAL_NR" NUMBER(3,0) DEFAULT -1, 
        "EVOD_DDATE_ID_SUBSCRIPTION" NUMBER(20,0) DEFAULT -1 NOT NULL ENABLE, 
        "EVOD_DPRCG_ID" NUMBER(20,0) DEFAULT -1 NOT NULL ENABLE, 
      
       EVOD_PART_DATE DATE  GENERATED ALWAYS AS ( TRUNC(TO_DATE(TO_CHAR(EVOD_DDATE_ID_VALID_FROM),'YYYYMMDD'),'MM')) VIRTUAL)
    PARTITION BY RANGE(EVOD_PART_DATE)
    interval(NUMTOYMINTERVAL (1,'MONTH'))
    SUBPARTITION BY LIST(EVOD_SOURCE_CD)
    SUBPARTITION TEMPLATE(
    SUBPARTITION "P_ITUNES"  VALUES ('ITUNES') ,
    SUBPARTITION    "P_WSP"  VALUES ('WSP'),
    SUBPARTITION   "P_GOOGLE"  VALUES ('PLAYSTORE'),
    SUBPARTITION   "P_DEFAULT"  VALUES ('~') ,
    SUBPARTITION   "P_AMAZON"  VALUES ('AMAZON_EREADER', 'AMAZON_MANUELL', 'AMAZON_TABLET') ,
    SUBPARTITION    "P_MSD"  VALUES ('MSD')
    )
    (
     PARTITION P01 VALUES LESS THAN (TO_DATE('200310','YYYYMM')) SEGMENT CREATION DEFERRED
    )
    PARALLEL 10  ;
    

    Any ideas?

    Thanks for Berlin

    First of all - the DOF you posted is INVALID - you do not specify a delayed segment creation for partitions. Specify you for the table.

    Also, you must remove the DEFAULT value - 1 for the partitioning column. The value '-1' cannot be converted to a valid date for the virtual partitioning column value.» The default value is useless and will give confusion around the year exception err when the exception should actually provide a NULL value for a column not null.

    The documentation explains how to use the EXCHANGE PARTITION and has the code example

    Maintenance of Partitions

    Exchange a Partition of a partitioned Table interval

    You can exchange of range partitions in a partitioned table interval. However, you must make sure that the partition of the interval was created before that you can swap partition. You can leave the database create the partition in the partition of the interval of locking.

    The following example shows an Exchange partition for the interval_sales table, range-partitioned using the monthly from partitions of 1 January 2004. This example shows how to add data to the table using charge Exchange partition for June 2007. Assume there is only a local index on the interval_sales table and equivalent index have been created on the interval_sales_june_2007 table.

    LOCK TABLE interval_sales  PARTITION FOR (TO_DATE('01-JUN-2007','dd-MON-yyyy'))  IN SHARE MODE;    ALTER TABLE interval_sales  EXCHANGE PARTITION FOR (TO_DATE('01-JUN-2007','dd-MON-yyyy'))  WITH TABLE interval_sales_jun_2007  INCLUDING INDEXES;
    

    Note the use of the FOR syntax to identify a partition that has been generated by the system. The name of the partition can be used by querying the *_TAB_PARTITIONS view of data dictionary to find the partition system-generated name.

    Given that the last paragraph? That's what showed Solomon.

    NOTE:-special attention to the FIRST paragraph. If you use segment carried OVER creating the partition you want to Exchange could NOT have been created yet.

    Make SURE that you lock the partition as the example shows, or you will get an exception if it has not been created.

    Also - we know NOT what PROBLEM you're trying to solve.

    If you exchange a PARTITION of a table subpartitioned your working table should actually be partitioned using the SAME parttioning as the subparts in the source table:

    See my response in this thread:

    https://forums.Oracle.com/forums/thread.jspa?threadID=2482090&TSTART=30

    In this thread I have provide the code example illustrating how the table should be created and made Exchange.

  • Move the data from the partitions again tablespace - direct table filled by ETL

    Hello

    We have a large composite table date-range/hash partitioned table (using time partitioning 11.2.0.3 range)

    1 partition for each month and each such partition 4 under separate partitions.

    We want to move some data from most significant storage but also direct table and inserted in all the days as part of the data warehouse and large table want to ensure

    operations below result in errors in the data loading procedure

    Suppose also should not take long to run lines 40 million or more each month.

    Select *.

    Of user_tab_partitions

    Where table_name = 'CUSTOMER_TRANSACTION '.

    And nom_partition like 'SYS % '.

    1. (1) Alter table retailer_transaction and rename partition < nom_partition > CUST_PART_ < YYYYMM >

    1. (2) tablespace create dedicated for the month of the affected partition

    1. ((3) alter table retailer_transaction move tablespace subpartition < sys... > < partition_tablespace > created in 2) above

    ALTER table retailer_transaction change the default attributes for the partition < CUST_PART < YYYYMM > < tablespace in 2 above > tablespace)

    4 global index which would eventually rebuild afterwards due to the transition if movement makes no valid.

    Several local bitmap indexes that belong to partitions.

    Thoughts?

    Thank you

    I agree in a good store of data, everything should be according to the best practices ETL or guideline. I guess it is a FACT table, because it's big enough. A method that I can share (followed in the real world big DW) is "ELP" IE Partition Exchange loading. You can find the basic architecture of the Internet.

    The basic architecture is as

    The source (in your case partitioned) Table--> (unpartitioned) intermediate Table--> Table possible target (partitioned)--> the cleaning activities (and overtime).

    You can use any ETL tool for this (I won't mention any other reasons).

    Later, you can delete the original table and use that new table as your FACT table, your application will be available all the time. There are drawbacks as most uses of double-spaced, other than normal ETL these work will take certain amount of resources so that other ALS etc. In addition, if you load a few current days during these activities you plan / program accordingly.

    Your demo is also fine, but regular ETL may fail because you rename the partitions (some uses of ETL tool partition name, in case you ever ELP) also unusable global indexes can cause failure (you have local too?).

  • How add us partition on an existing table?

    Hi gurus,

    What would be the best way to add a partition to an existing table?

    Is there a simple documentation for example?

    Thank you

    What would be the best way to add a partition to an existing table?

    Is there a simple documentation for example?

    Was it something you were ask in an interview?

    You cannot add a partition to a table unless this table is a partitioned table.

    The table is already partitioned? If so, after the DDL.

    The Oracle documentation has examples of adding partitions to a table that is already partitioned

    Partition management

    Adding Partitions

    This section explains how to manually add partitions of a partitioned table and explains why partitions can be added specifically for partitioned more indexes.

    Adding a Partition to a partitioned Table range

    Use of the ALTER TABLE ... ADD PARTITION statement to add a new partition at the end 'high' (the point after the last existing partition). To add a partition at the beginning or in the middle of a table, use the SPLIT PARTITION clause.

  • Need to create the Partition in the history table

    Hello

    I have an audit table that stores the data for the last 8 years in it and the customer wants to retain the data for the last 8 years. Now as adding data to this table is increasing, there is a delay in execution of report which are acquired by querying on this table.

    Basically, they go a from date and to date. Then these date are compared with two columns of dates in the table. The condition of the query will be as below

    TRUNC (NVL (DATE1, DATE2)) > = TRUNC (TO_DATE (?, ' dd/mm/yyyy ""))

    AND TRUNC (NVL (DATE1, DATE2)) < = TRUNC (TO_DATE (?, ' dd/mm/yyyy ""))

    Users can query for any date range.

    I am thinking of creating a Partition of the range on this table for each month during the 8 years of data. Please suggest on the question of whether I should use partition interval range to make it more effective. And would also create an Index on this partition for the above two day columns.

    12 (months) SO * 8 (years) = 98 would be created partitions. This will not overload the schema of database/Tablespace? Y at - it another effective way to set the table.

    Please suggest and let me know for any clarification.

    There are 2 approaches (but not limited to 2) to create the Partition on an existing table:

    Note: There is no ALTER TABLE statement to convert a heap table to a partitioned table.

    1. create a temporary Partitioned table with the same types of data in the column. Take a dump of the original table (HEAP) export and import the dump into the newly created partitioned intermediate table. After checking the data file the original and rename the interim even as the original table.

    2 using the package Oracle DBMS_REDEFINITION automates the steps above from said (not exactly the same steps, however) and its done online - which means there is no required downtime, the original table may undergo DML operations during this process of redefinition. View partitioning of a table online with DBMS_REDEFINITION | Oracle instructor

    According to my understanding if let us know as a partition interval then in April if there is an inserted record then it will create a new partition for the month of April will be of value less than 30 April 2014 "and all other documents created in April will pass under it"

    Yes, it's a feature of 11g, which Oracle manages adding partitions as needed. In earlier versions DBA can add partitions manually from time to time. Reference www.gavinsoorma.com/2009/09/11g-interval-partitioning/

    Here the reason for check the sent_out_datetime NVL will be NULL for few records, so in this case we want to get the records for dates of mapping them to received_datetime

    In addition, try to replace the NVL with COALESCE and test it. This would help improve performance.

  • privileges for partitions and see them in object

    Hello

    Anyone seen this before? The dw team has an appid with privileges from read/write to a partitioned table.

    connected under appid adshX, I am able to choose among stgadm3. TMUTL_FND_POSN partition (p1)

    1 * select count (*) in the stgadm3. TMUTL_FND_POSN partition (p1)
    SQL > /.
    COUNT (*)
    --------------------------------------------------------------------------------
    927282

    again, logged in as adshX appid, I am able to choose among object, but only the name of the table is returned.
    SQL > select subobject_name, object_name, object_type, owner
    of object where owner = 'STGADM3' AND object_name = "TMUTL_FND_POSN";

    OWNER TYPE_OBJET PARAMETER SUBOBJECT_NAME
    --------------- ---------------------- --------------------- ----------------------
    STGADM3 TABLE TMUTL_FND_POSN

    If connected as sys or system, the partition table AND are returned from all_objectds.
    OWNER TYPE_OBJET PARAMETER SUBOBJECT_NAME
    --------------- ---------------------- --------------------- ----------------------
    STGADM3 TABLE PARTITION P1 TMUTL_FND_POSN
    STGADM3 TABLE TMUTL_FND_POSN P_MINUS_1 PARTITION
    STGADM3 TABLE TMUTL_FND_POSN

    In addition, the ID adshX have access to views dba_ *, but which returns the correct results.
    OWNER TYPE_OBJET PARAMETER SUBOBJECT_NAME
    --------------- ---------------------- --------------------- ----------------------
    STGADM3 TABLE PARTITION P1 TMUTL_FND_POSN
    STGADM3 TABLE TMUTL_FND_POSN P_MINUS_1 PARTITION
    STGADM3 TABLE TMUTL_FND_POSN

    My first thought was that some private was missing, but because they can read/write/create tables and partitions with this id, I don't know what other private, they would need so that the information will be displayed.

    It is an oracle 10g db.

    Thanks, Pete

    >
    My first thought was that some private was missing, but because they can read/write/create tables and partitions with this id, I don't know what other private, they would need so that the information will be displayed.
    >
    You can make it appear by granting the user to SELECT ANY TABLE or DBA, but you may not want to do. Even grant ON the table to the user allows you to hide the information of subpartion.

  • Type logic Partition of an existing table

    Dear all,

    My database is 10gr 2 and Linux is the operating system.

    One of my table in the production database is huge and contains lots of data. Table is growing daily. There are many queries that users run on this table and the selection criteria is normally the date of entry of the registration, it's an Entrty_Date field with the date data type.

    I want a partition logical on this table in such a way, the table name remains the same, and data are logically partitioned.

    As if the Entry_Date is from 2005, a partition is made on criteria:


    2005-2006
    2006-2007
    .
    .
    2011
    . at the request of the user for records having entry date > 2011... the query is made only this piece of the table, which makes the fast query.

    I hope that I am able to make you understand my problem. If its possible in Oracle please let me know the name of the method and I'll RND on this one. And I have to do it on an existing table that contains a lot of data.

    Thank you
    Imran

    Hello

    You can do this
    http://www.Oracle-base.com/articles/Misc/PartitioningAnExistingTable.php
    I suggest go fill through the myths of have from before backward Oracle documentation and to understand and then to proceed
    http://download.Oracle.com/docs/CD/B10501_01/AppDev.920/a96612/d_redefi.htm

    -Pavan Kumar N

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