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Magento’s DB seems to get bloated rather quickly with cached data and logs, occupying an obscene amount of space, so it often needs a good clear out.

Many of those tables can safely be flushed, without affecting the operation of the website.

I’ve read a few articles on which tables are “safe” to empty- while there does seem to be some mixed views/opinions, there is enough common ground to establish some consensus. I’ve stuck to truncating the following tables, and it seems to be the trick (i.e. dramatically increase available disk space):

 

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TRUNCATE core_cache;
TRUNCATE core_cache_option;
TRUNCATE core_cache_tag;
TRUNCATE core_session;
TRUNCATE dataflow_batch_export;
TRUNCATE dataflow_batch_import;
TRUNCATE enterprise_logging_event;
TRUNCATE enterprise_logging_event_changes;
TRUNCATE enterprise_support_backup;
TRUNCATE enterprise_support_backup_item;
TRUNCATE index_event;
TRUNCATE index_process_event;
TRUNCATE log_customer;
TRUNCATE log_quote;
TRUNCATE log_summary;
TRUNCATE log_summary_type;
TRUNCATE log_url;
TRUNCATE log_url_info;
TRUNCATE log_visitor;
TRUNCATE log_visitor_info;
TRUNCATE log_visitor_online;
TRUNCATE report_event;
TRUNCATE report_viewed_product_index;

P.s. some of the tables above may not exist in your DB, so just strip those out.

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