Bug #48359 ALTER TABLE xx COMMENT - locks large tables
Submitted: 27 Oct 2009 19:24 Modified: 24 Jun 2010 8:01
Reporter: Colin Mutter Email Updates:
Status: In progress Impact on me:
None 
Category:MySQL Cluster: Cluster (NDB) storage engine Severity:S3 (Non-critical)
Version:mysql-5.1-telco-7.1 OS:Linux (RHEL 4)
Assigned to: Assigned Account CPU Architecture:Any
Tags: 5.1.44-ndb-7.1.3, alter, ALTER TABLE, comment, comments, lock table, performance, slow

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Description:
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If the data you need to attach is more than 50MB, you should create a compressed archive of the data, split it to 50MB chunks, and upload each of them as a separate attachment.

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