How to speed up export import

Question

Database 10.2.0
While doing export/import operation what are factors effecting the speed of operation..?

Answer 1

Below are the points which I collected from different links in my Oracle Notes:
Faster Export:
1. direct=y
2. subsets by query option
3. proper buffer size by rows in array * max row size
4. place the dump file to another disk (which is not having any datafile; to avoid I/O contention)
5. when database activity is low (in the morning or late eve)
6. PARALLEL
Faster Import:
1. indexes=n
2. constraints=n
3. user large buffer parameter
4. increase recordlength
5. commit=n
6. statistics=none
7. enough undo size
8. enough pga/sort_area_size
9. enough / Increase db_cache_size/db_block_buffers size and share_pool_size
10. when database activity is low (in the morning or late eve)
11. PARALLEL
Now check how your import is going on:
select
substr(sql_text,instr(sql_text,'into "'),30) table_name,
rows_processed, round((sysdate-to_date(first_load_time,'yyyy-mm-dd hh24:mi:ss'))*24*60,1) minutes,
trunc(rows_processed/((sysdate-to_date(first_load_time,'yyyy-mm-dd hh24:mi:ss'))*24*60)) rows_per_minute
from
sys.v_$sqlarea
where
sql_text like 'insert %into "%' and command_type = 2 and open_versions > 0;
Regards
Girish Sharma