Oracle best way to delete millions of rows

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August undefined, 2024

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 … WebSep 10, 2024 · Vanilla delete - took lot of time. Bulk FORALL and DELETE - took lot of time. Exchanging Partition - this is the fastest but all the 8 indexes go to unusable state and i …

Transferring large amount (84 million rows) of data efficiently

WebSep 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 … WebApr 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 … optimhome 83

sql - Best way to delete millions of rows by ID - Stack Overflow

http://www.oracleconnections.com/forum/topics/delete-millions-of-rows-from-the-table-without-the-table WebFirst, 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 … 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 … optimhome 64

Fastest way to delete all the data in a large table

Mass Delete - Ask TOM - Oracle

WebJun 7, 2024 · - Both methods delete the same rows from A* => it's the same amount of work to do the delete - Option 1 has one statement; Option 2 has two statements; 2 > 1 => … WebUse partitioning: The fastest way to do a mass delete is to drop an Oracle partition. Tune the delete subquery: Many Oracle deletes use a where clause subquery and optimizing the … optimhome 77Hang on. Removingdata by creating a table? How does that work? Bear with me. Inserting rows in a table is faster than deleting them. Loading data into a new table using create-table-as-select (CTAS) is faster still. So if you're removing most of the rows from a table, instead of issuing a delete you can: 1. Create a … See more Removing rows is easy. Use a delete statement. This lists the table you want to remove rows from. Make sure you add a whereclause that identifies the data to wipe, or you'll delete all the rows! I discuss how delete works - … See more Typically you use alter table … moveto change which tablespace you store rows in. Or other physical properties of a table such as compression settings. With a filtered table move you can migrate a subset of the data. Do … See more If you want to wipe all the data in a table, the fastest, easiest way is with a truncate: This is an instant metadata operation. This will also reset the high-water mark for the table. By default it … See more When you partition a table, you logically split it into many sub-tables. You can then do operations which only affect rows in a single partition. This … See more optimhome epinal

"WebSep 29, 2014 · 2 Answers Sorted by: 1 Try this: DECLARE COUNTER INTEGER :=0; CANT INTEGER; BEGIN DBMS_OUTPUT.PUT_LINE ('START'); loop -- keep looping COUNTER := COUNTER + 1; --do the delete 1000in each iteration Delete TEST where rownum <= 1000; -- exit the loop when there where no more 1000 reccods to delete. " - Oracle best way to delete millions of rows

Transferring large amount (84 million rows) of data efficiently

sql - Best way to delete millions of rows by ID - Stack Overflow

Oracle best way to delete millions of rows

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