oracle - How to improve the SQL insert query performance? -


i getting long response time while querying data (83 million rows approx.) 1 table , inserting table in same schema. takes 1 , half hour. query looks below:

insert table_a   (     dim_key,     client_key,     consumer_dim_key,     prcs_wk   )   (     ((     (select dim_key,       client_key,       consumer_dim_key,       prcs_wk               (*select distinct dim_key,         client_key,         prcs_wk,         consumer_dim_key,         sum(sale_amount) over(partition consumer_dim_key) sale_amount           fact_table           dim_key  = '300067'           , criteria_id   = '1234'           , is_exists = 'n'*       )     sale_amount > 0     )   union     (select dim_key,       client_key,       consumer_dim_key,       prcs_wk               (*select distinct dim_key,         client_key,         prcs_wk,         consumer_dim_key,         sum(sale_amount) over(partition consumer_dim_key) sale_amount           fact_table           dim_key  = '300067'           , criteria_id   = '1235'           , is_exists = 'n'*       )     sale_amount > 0     ))   union     (select dim_key,       client_key,       consumer_dim_key,       prcs_wk               (*select distinct dim_key,         client_key,         prcs_wk,         consumer_dim_key,         sum(sale_amount) over(partition consumer_dim_key) sale_amount           fact_table           dim_key  = '300067'           , criteria_id   = '1236'           , is_exists = 'n'*       )     sale_amount > 0     ))   )

here tables present in same schema. queries marked * returns number of rows as:

 sub-query 1: 80 million rows sub-query 2: 3.1 million rows  sub-query 3: 0.2 million row

  • you can try use append hint make oracle write new data on hwm mark.
  • if have indexes oracle wastes times have them up-do-date. can disable them , rebuild after insert finishes.
  • also if there 83 millions rows insert generate lot of redo information. disable redo log generation of table use the nologging option: alter table your_table nologging;
  • also can use asynchronous writing online redo log commit_wait, commit_logging tips
  • you can set job queue schedule long-running operation in background. read more use this
  • you can use parallel dml

this suggestions can give without having explain plan.


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