My developer came with a requirement of creating partitions on a table which has 40 million records. His exact requirement is to create as many as partitions in such a way that 1 partition should not exceed 5k-10k records and these records should be inserted/updated on the same date (i.e. using a column as source_timestamp field). How to accomplish this?
View 2 RepliesIf I try create table from the following syntax
create table a as select * from table b;
Then I could get only base table structure alone, I would like to get partition syntax as well.
I would like to cretae 3 partitions for a table
partition 1 = < 2011
partition2 = <2012
partition 3 = any other value not staisfying partition 1 and partition 2
i would like to know how to create a partition 3 without specifying the range so that the data which are not coming under the range of other partitions (Partition 1 & 2) will automatically goes to this partition 3.
Also in the above case if i insert data of year 2009 then where will it go , to partition 1 (or) 2 since both of them matches the condition (<2011 and <2012) (or) do i need to use between clause while creating partitions?
mucking on an Oracle 11.2 database, simple range partitioning issue. Seems using a "complex" formula inside the AT clause annoys it? Or am I doing something wrong?
I create the table with RANGE partition just fine:
CREATE TABLE my_part_tab
( id number,
sdate date
)
PARTITION BY RANGE ( sdate )
( PARTITION P2013Q1 VALUES LESS THAN ( TO_DATE('01-jan-2013','dd-mon-yyyy') ),
PARTITION P2013Q2 VALUES LESS THAN ( TO_DATE('01-jul-2013','dd-mon-yyyy') ),
PARTITION P2013Q3 VALUES LESS THAN ( TO_DATE('01-oct-2013','dd-mon-yyyy') ),
[code]...
Table created.(and yes, I'm aware of INTERVAL option that'll do this next part "automagically", however, INTERVAL and REFERENCE partitioning are incompatible, and the child table is using REFERENCE partition). to make things easier on DBA for future, I'm trying to create a script that makes added a year's worth of partitions less manual.So far, I have the following working:
ACCEPT lYear PROMPT "Add Paritions for which calendar year?"
ALTER TABLE my_part_tab SPLIT PARTITION PMAX
AT ( TO_DATE('01-apr-&lYear','dd-mon-yyyy') ) INTO ( PARTITION P&lYear.Q1,PARTITION PMAX );
ALTER TABLE my_part_tab SPLIT PARTITION PMAX
AT ( TO_DATE('01-jul-&lYear','dd-mon-yyyy') ) INTO ( PARTITION P&lYear.Q2,PARTITION PMAX );
[code]...
But no luck ...Same issue with other variations:
ALTER TABLE my_part_tab SPLIT PARTITION PMAX
AT ( (ADD_MONTHS(TO_DATE('01-jan-&lYear','dd-mon-yyyy'),12)) ) INTO ( PARTITION P&lYear.Q4,PARTITION PMAX );
ALTER TABLE my_part_tab SPLIT PARTITION PMAX
AT ( (TO_DATE('01-jan-'||TO_CHAR(TO_NUMBER('&lYear')+1,'fm9999'),'dd-mon-yyyy')) ) INTO ( PARTITION P&lYear.Q4,PARTITION PMAX );
I have a table that has 2 columns of type nested table. Now in the purge process, when I try to truncate or drop a partition from this table, I get error that I can't do this (because table has nested tables). how I will be able to truncate/drop partition from this table? IF I change column types from nested table to varray type, will it work?
Also, is there any short method of moving existing data from a nested table column to a varray column (having same fields as nested table)?
Initially 2008 to 2010 and 2009 to 2011 partitions are created, After that two more new partitions are created 2008 to 2009 and 2009 to 2010.
How can we move data from old partitions to corresponding new partitions.
We have a table with interval partition. This table is accessed very frequently. We are suppose to exchange partitions between this actual table from it's corresponding staging table.
In order to keep the newly created partitions empty, is there a way to restrict other applications from using it before we push data from staging table to it's actual table.
I have tables in production which has got huge no of partitions(say more than 100), but I would like to extract table definiation along with mentioned few partitions(say 10 partitions) alone. How to do that, which way is the best to extract DDL with right format.
because when I use metadata package the format for the extraction is not good, is there a way to extract table definition with mentioned partition names.
How can we partition the existed table.
The table is like this
CREATE TABLE my_table (
id NUMBER,
description VARCHAR2(50)
);
[Code]...
I want to partition this table into 3 partitions.
The first partition should contain the values less than 3.
The Second partition should contain the values less than 5.
The third partition should contain the values less than 6.
We are using partition exchnage to swap individual partitions into table which then backed up.
This being done one partition at a time.
Is it possible to swap several partitions of a tabel in one go.
using Oracle 11.2.0.3
partioned by date, one partition of reach day.
Is it possible say to move the last 7 days partitions into the other table for backup using partition exchange?
I couldn't either DROP or TRUNCATE the table partitions that were created. Here are the DDLs and DMLs I'm using.
Create table student(no number(2),name varchar(2)) partition by range(no) (partition
p1 values less than(10), partition p2 values less than(20), partition p3 values less
than(30),partition p4 values less than(40));
Insert into student values(1,'a');
Insert into student values(11,'b');
Insert into student values(21,'c');
Insert into student values(31,'d');
When I do the following query, it returns data.
SELECT * FROM STUDENT PARTITION(p1);
But, when I try to perform any of the following queries, it says invalid partition name.
ALTER TABLE STUDENT DROP PARTITION p4;
ALTER TABLE STUDENT TRUNCATE PARTITION p3;
I am using Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit
I have to drop some partitions in table on production environment (to get free space). The environment have to be continuously available. I was considering of use ALTER TABLE ... DROP PARTITION ... UPDATE INDEXES but it is slow, because of use clause UPDATE INDEXES. Is there another possibility to remove these data?
View 2 Replies View RelatedWhat is the limit on number of partitions on a table.on many forums , 1024k-1 is given the maximum limit.But Exactly , I am not able to understand this 1024k-1.
View 2 Replies View RelatedWhat is the difference between CREATE EXTERNAL TABLE Vs CREATE TABLE .?
Is CREATE EXTERNAL TABLE included in CREATE TABLE?
i have many partitions in one table. i need metadata for some of the partitions. We have any option to get the metadata for partitions only.because while selecthing the table meatdata i am getting long script.
View 2 Replies View RelatedI have a day based partitioned table TAB1.Let say for month Aug 2013 Partitions are like P010813,P020813,P030813 up to P310813.When gather stats job will run i want to analyze only the last 3 used partitions based on current date, this would be P180813,P190813,P200813. write a query which will give the last 3 used partitions.e.g.
If run query on 20-AUG-2013.P180813P190813P200813FOR 25-AUG-2013P230813P240813P250813
ALTER TABLE table_name DROP PARTITION (partition_1000);
ALTER TABLE table_name DROP PARTITION (partition_1001);
...
.........
......
ALTER TABLE table_name DROP PARTITION(partition_1320);(b
it is a delta partition,so trying to remove 320 partitions at once in pl/sql developer for a single table.
Like this i have to remove for more then 15 tables one by one, will this effect the database like filling up the archinve log destination by writing more logs.
kind of problems that i am going to face , as i am doing it on the production box directly.
I have more 100 partition in a table, I would like to query 10 partitions alone in single statement, Hope it could be possible like query data for single partitions, provide the syntax for the same.
Because if I try to query for all the partition then the query is Hanging due to the large no of data, then I can query single partition by partition then it takes more than a day. so, I would like query data for 10 partition in a single select.
Query to drop partitions on a table who have no.of rows as zero.
select 'ALTER' || '' || 'TABLE' || TABLE_NAME || 'DROP' || 'PARTITION' || PARTITION_NAME from dba_tab_partitions where TABLE_OWNER='xyz' ;
select count(*) from table_name partition (partition_name);
Lets say I have a table like the following -
ID--------DATE_TIME-----------------VALUE
101----- 01/01/2012 14:00:00 ---12
101----- 11/01/2012 23:00:00 ---17
101----- 13/01/2012 10:00:00 ---22
101----- 19/03/2012 08:00:00 ---7
101----- 19/03/2012 19:00:00 ---7
101----- 19/03/2012 20:00:00 ---7
101----- 20/03/2012 02:00:00 ---3
101----- 20/03/2012 03:00:00 ---3
101----- 21/03/2012 13:00:00 ---14
101----- 21/03/2012 14:00:00 ---14
101----- 21/03/2012 21:00:00 ---13
101----- 21/03/2012 22:00:00 ---13
101----- 21/03/2012 23:00:00 ---13
101----- 22/03/2012 00:00:00 ---13
I'm looking for a script to partition the data into sections where the VALUE is the same over a constant period of time with no breaks. I'd like to give each partition a value to identify it by.
So the outcome of the script would be the following -
ID--------DATE_TIME-----------------VALUE-----IDENTIFIER
101----- 01/01/2012 14:00:00 ---12----------1
101----- 11/01/2012 23:00:00 ---17----------2
101----- 13/01/2012 10:00:00 ---22----------3
101----- 19/03/2012 08:00:00 ---7------------4
101----- 19/03/2012 19:00:00 ---7------------5
101----- 19/03/2012 20:00:00 ---7------------5
101----- 20/03/2012 02:00:00 ---3------------6
101----- 20/03/2012 03:00:00 ---3------------6
101----- 21/03/2012 13:00:00 ---14----------7
101----- 21/03/2012 14:00:00 ---14----------7
101----- 21/03/2012 21:00:00 ---13----------8
101----- 21/03/2012 22:00:00 ---13----------8
101----- 21/03/2012 23:00:00 ---13----------8
101----- 22/03/2012 00:00:00 ---13----------8
I was trying to do something with trunc(date_time) but that didnt work out right as the blocks of data can carry over several days as seen in the rows with IDENTIFIER = 8.
Can we add partitions for materialized views like tables ? ALTER TABLE owner.tablename ADD PARTITION p1 VALUES LESS THAN (2012,12);
Like is there any syntax for mview ALTER TABLE mv.mviewname ADD PARTITION ..... ?
I created a materilaized view with partitions and i need to add partitions dynamicaaly using stored procedure for that i need to check whther the partiions with the same name existing.where can i see the partition names for a materilaized view is there any table like "USER_TAB_PARTITIONS"?.if the same query exists in the forum
View 3 Replies View RelatedI have a table which has 2 range partitions on a date column currently.
CREATE TABLE TABLEA (
RUN_TIME INT NOT NULL
)
PARTITION BY RANGE (RUN_TIME)
(
PARTITION DATAONE VALUES LESS THAN (20110101000000) TABLESPACE SPACE1
PARTITION DATATWO VALUES LESS THAN (MAXVALUE) TABLESPACE SPACE2
);
I am planning to drop one partition i.e DATAONE. So table will have one partition left for MAXVALUE. Does it make sense to have a partition with MAXVALUE? Isn't it same as TABLEA in terms of number of records? TABLEA is also in tablespace SPACE2. Should i remove partition DATATWO also? If i have to what is the best way to move all DATATWO records to base table TABLEA?
I am trying to execute dynamic SQL in Stored Function and I don't know how to do this.
Explanation:
In the function I am calling pr_createtab is procedure which will create a physical table and return the table name in the out variable v_tbl_nm.
I need to query on this dynamic table and return the result as return result. But i am not able to do it.
Here T_web_loylty_report_table is a type.
CREATE OR REPLACE function CDW_DSS.f_ReturnTable(i_mrkt_id in number, i_cmpgn_year in number)
return T_web_loylty_report_table is
v_tbl_nm varchar2(50);
i_cntry_cd varchar2(20);
v_sql_str varchar2(32567);
[code]......
We have a table in the client database that has two columns - column parent and column child. The whole hierarchy of DB table dependencies is held in this table.If Report 1 is dependent on Table A and Table A in turn is dependent on two tables Table M and Table N. Table N is dependent on table Z it will appear in the db table as,
Hierarchy Table
Parent Child
Report1Table A
Table ATable M
Table ATable N
Table NTable Z
Requirement :
From the above structure, we need to build a table which will hold the complete hierarchy by breaking it into multiple columns.The o/p should look like this
-ParentChild 1Child 2 Child 3
-Report1Table ATable M
-Report1Table ATable N Table Z
Child 1, Child 2, Child 3 ....and so on are columns.The number of tables and the no of hierarchical relationships are dynamic.
SQL Statements to create hierarchy table:
create table hierarchy (parent varchar2(20), child varchar2(20));
insert into hierarchy values ('Report1','Table A');
insert into hierarchy values ('Report1','Table B');
insert into hierarchy values ('Table A','Table M');
insert into hierarchy values ('Table B','Table N');
insert into hierarchy values ('Report2','Table P');
insert into hierarchy values ('Table M','Table X');
insert into hierarchy values ('Table N','Table Y');
insert into hierarchy values ('Report X','Table Z');
Approached already tried :
1) Using indentation : select lpad(' ',20*(level-1)) || to_char(child) P from hierarchy connect_by start with parent='Report1' connect by prior child=parent;
2)Using connect by path function :
select *
from (select parent,child,level,connect_by_isleaf as leaf, sys_connect_by_path(child,'/') as path
from hierarchy start with parent='Report1'
connect by prior child =parent) a where Leaf not in (0);
Both the approaches give the information but the hierarchy data appears in a single column.Ideally we would like data at each level to appear in a different column.
what command is used to create a table by copying the structure of another table including constraints ?
View 2 Replies View RelatedI am working on an archiving strategy. I want to roll off transactions that are older than seven days, but only if they are flagged as Completed. The numbers of transactions are very large so this is a worthwhile venture.
The only strategy I have been able to come up with so far is to partiton on date. Then when 7 days comes up, sweep the about-to-be archived day for the few remaining not Completed transactions, put those into a new table (a new version of this partiton) and switch partitions. Each day I do this until the older parititions are empty.
writing a trigger to drop partitions with zero rows which are older than 6months and drop the local indexes and rebuild the global indexes for any schema in a databaase ?
I have tried the below code :
declare
v_statement varchar2(600);
v_rows number;
begin
for x in (select *
from dba_tab_partitions
[code]........
I want to avoid using row number and also want to dynamically select a schema when executing the script.
In my database,stale_percent is set to 10. and i have table which has partition. i have dropped table partition dropped which has 10% of data. I would like to know whether oracle will consider only insert,update,delete as stale percent or will it include the dropping paritition data also. Because my stats gather is not running. When i include drop partition data it exceed 10% of stale_percent,But excluding dropped partition it is not exceeds 10% of stale.
TABLE_NAME PARTITION_NAME SUBPARTITION_NAME INSERTS UPDATES DELETES TIMESTAMP TRU DROP_SEGMENTS
------------------------------ ------------------------------ ------------------------------ ---------- ---------- ---------- ----------- --- -------------
sample_DATA_DATA 235825577 0 0 11-NOV-2012 NO 3
test_DATA_DATA 811618472 0 0 11-NOV-2012 NO 12
sample_DATA_DATA SYS_P2665099 3005966 0 0 11-NOV-2012 NO 0
sample_DATA_DATA SYS_P2665119 3873671 0 0 11-NOV-2012 NO 0
[code].....
I have a table with 1 million rows,all rows are based on the gender male and female.
So that i have done two partitions based on the gender Male and Female.
After that i performed the query
SELECT COUNT(*) FROM student WHERE gender='MALE';
In that case performance is improved,because oracle scans a single partition instead of scanning entire table.
Suppose i have partitioned according to the date column and i performed the query
SELECT COUNT(*) FROM student WHERE gender='MALE';
In that case performance will be improved or not