I try to insert millions of records into a table that has more than 20 indexes.
In the last run it took more than 4 hours per 100.000 rows, and the query was cancelled after 3½ days…
Do you have any suggestions about how to speed this up.
(I suspect the many indexes to be the cause. If you also think so, how can I automatically drop indexes before the operation, and then create the same indexes afterwards again?)
- The space used by the indexes is about 4 times the space used by the data alone
- The inserts are wrapped in a transaction per 100.000 rows.
Update on status:
The accepted answer helped me make it much faster.
You can disable and enable the indexes. Note that disabling them can have unwanted side-effects (such as having duplicate primary keys or unique indices etc.) which will only be found when re-enabling the indexes.