pg_xlog and the WAL files

Hi,

I have two questions about PostgreSQL:

1. What happens when the file system on which the pg_xlog directly resides, completely fills up? Does PostgreSQL wait until free space is available again?

2. Our PostgreSQL database (version 8.1.4.) generates almost 20 GB of WAL files per hour! What are the best practices related to administering large amounts of WAL files? Would it be wise to compress the WAL files?

Thanks in advance,

Kind regards,

Omar

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