Oracle best way to delete millions of rows
http://www.dba-oracle.com/t_deleting_large_number_of_rows_in_oracle_quickly.htm WebJan 5, 2011 · Oracle. Hi, I have a table which has 12 million rows and I want to delete around 9 million rows from that table in Oracle. The query is : DELETE FROM TAB1 WHERE COL_PK IN (SELECT COL_PK FROM TAB2); --COL_PK field is the primary key TAB1 have 12 million records and TAB2 have 9 million records. This query is taking a lot of time to complete.
Oracle best way to delete millions of rows
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WebApr 27, 2024 · The trick is making a view that contains the top, say, 1,000 rows that you want to delete: 1 2 3 4 5 CREATE VIEW dbo.Comments_ToBeDeleted AS SELECT TOP 1000 * FROM dbo.Comments ORDER BY CreationDate; GO Make sure that there’s an index to support your view: 1 CREATE INDEX IX_CreationDate ON dbo.Comments(CreationDate); WebApr 5, 2002 · A. In a datawarehouse environment there are instances when after loading say more than 500 million records one discovers that one of the loads that loaded 200 million records was not correct and needs to delete these 200 million records based on a WHERE condition. Is the following SQL the best way to do it or there is a better way
WebJan 18, 2012 · 3 Answers Sorted by: 5 alter table TABLENAME move; followed by rebuilding the indexes on that table should do what you want. After 'moving' the table around, the … WebJul 11, 2024 · best way to remove millions of rows. I have a table with around 60 millions of rows, It contains data from 2008. Now, I have decided to remove data upto 2024,31st of …
WebJul 23, 2024 · If you delete more than some, say 25% of the rows in table_x, maybe it's beter to do something like below: create table table_x_del as select * from table_x where ...; --- the where condition should include all the rows you will … http://www.dba-oracle.com/t_oracle_fastest_delete_from_large_table.htm
WebI know that the best way to delete large number of rows is to create table as ... , rebuild indexes, rename original table, rename new table into original name, drop original table.Question: how does one determine when to use this approach as appose to simply run a delete statement? Is there a percentage of the total that I need to look at?
WebJan 20, 2011 · Here is the script that one of our IT people uses to do this purge: BEGIN LOOP delete FROM tbl_raw where dist_event_date < to_date (' [date]','mm/dd/yyyy') and rownum … theoz textWebFirst, we should create a log table with 2 columns - id & flag ( id refers to the id you want to delete; flag can be Y or null, with Y signifying the record is successfully deleted). Later, we create a function. We do the delete task every 10,000 rows. You can see more details on … shutdown pc in lenovo laptopWebApr 14, 2011 · Most effective way to Delete large number of rows from an online table on a daily basis I have a need to write a cleanup script that would delete old data (1-2 Million … theoz theoriWebJul 19, 2011 · When a DELETE is issued, Oracle stores the whole deleted row in the rollback segments, ... What will be the best way to delete these large number of rows from the big table. November 21, 2008 - 5:41 pm UTC . it would be by NOT USING DELETE. ... Now it took a little over 5 minutes to delete 3 million rows in these 2 partitions, a multi-fold ... theoz trelleborghttp://www.oracleconnections.com/forum/topics/delete-millions-of-rows-from-the-table-without-the-table shutdown pc downloadWebSep 26, 2014 · 1) Restore a backup of source database as the destination database 2) Drop every tables except the one needed on the destination database 3) TRUNCATE source 4) INSERT INTO source SELECT * FROM destination WHERE keep_condition = 1 Plan C: 1) INSERT INTO destination SELECT * FROM source 2) DELETE source WHERE … shutdown pc in windows 11http://www.dba-oracle.com/t_oracle_fastest_delete_from_large_table.htm the oz theory