I'm asking, because we have a bigger datawarehouse and dump the data for a backup every night. Unfortunately, the backup now takes realy long. That means, other processes that insert data will have to wait which is sometime really long! I was searching for a way to avoid this. I thought besides the query-speedub we could also gain some benefit for the backup timing... but it sounds, that this will not automatically help me with that. :-(
No, all the tables are locked in ACCESS SHARE mode. All that means is that you cannot alter the schema of the tables in any way.
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