:Snipped.
I am having problems with MySQL 4.0.12 on RedHat Advanced Server 2.1 using a dual Xeon with 8 GByte of RAM.
I have a database collecting logs. Each day, a new table is created. In order to allow for queries across more than one day, I use 'MERGE' tables. Each individual table contains 10-30 Million rows. The merge table covers 30 days (one month).
At the start of a new day, the merge table is rebuild using an 'alter table' statement. However, this statement is sometimes locked for quite a while, if queries against the table are pending. In this case, the context switch rate of the server 'explodes' to 100,000 and higher. The server becomes essentially unresponsive.
Usually, I can 'fix' things by killing some queries that lock the 'alter table' querie. However, this causes the server to crash in some cases (not well reproducable).
Error message from log:
Can I suggest you try creating a second merge table with a different name and then doing a double rename to swap the two merge tables i.e.
"rename table merge to merge_old, merge_new to merge".
Anyway that's what I'd try next.
Cheers
-- Chad Hanna Chairman Berkshire Family History Society www.berksfhs.org.uk Quality Family History Data www.familyhistoryonline.net
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