46 lines
1.0 KiB
PHP
46 lines
1.0 KiB
PHP
# Prerequisites:
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# connections:
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# cq - connection where queries are run
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# ce - connection where explain is run
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# variables:
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# query - query to explain
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# format - explain format: 'json' for json, or traditional otherwise
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# point - syncing point
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--disable_reconnect
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connection cq;
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--disable_result_log
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--disable_query_log
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let $QID= `SELECT CONNECTION_ID()`;
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eval SET DEBUG_SYNC= '$point SIGNAL ready_for_explain WAIT_FOR explained';
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send_eval $query;
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connection ce;
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--disable_result_log
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--disable_query_log
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if ($format == 'json') {
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let $fmt= FORMAT=JSON;
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}
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if ($format != 'json') {
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let $fmt= FORMAT=TRADITIONAL;
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}
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--enable_result_log
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--echo EXPLAIN $fmt FOR QUERY '$query'
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# Let the query being explained reach the sync point
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SET DEBUG_SYNC= 'now WAIT_FOR ready_for_explain';
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SET DEBUG_SYNC= 'after_explain_other SIGNAL explained';
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--error $err
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--eval EXPLAIN $fmt FOR CONNECTION $QID;
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connection cq;
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--disable_result_log
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--disable_query_log
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reap;
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SET DEBUG_SYNC= 'RESET';
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--enable_query_log
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--enable_result_log
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--enable_reconnect
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