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Peak Mysql. Status a queries "Sending data" and processor loaded on 100%

Server Mysql 5.1.49. The processor was suddenly loaded on 70-80% two days ago, after sleeping for the next day again loaded, and then slept, now the load is not falling. It was found that queries are executed rapidly compared to their sending to the client (in the status of MySQL stands Sending data). In table 3 values greater than 8mln. records. Indices are. The network is not loaded. The configuration is not affected to peak. This is not DOS. What can cause pressure or a slow transfer?

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