103 lines
2.4 KiB
Plaintext
103 lines
2.4 KiB
Plaintext
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#
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# Preparatory cleanup.
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#
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DROP TABLE IF EXISTS t1;
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#
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# We need a fixed timestamp to avoid varying results.
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#
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SET timestamp=1000000000;
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#
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# We need big packets.
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#
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# Capture initial value to reset at the end of the test
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# Now adjust max_allowed_packet
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SET @@global.max_allowed_packet= 1024*1024*1024;
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max_allowed_packet is a global variable.
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In order for the preceding change in max_allowed_packets' value
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to be seen and used, we must start a new connection.
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The change does not take effect with the current one.
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For simplicity, we just disconnect / reconnect connection default here.
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Disconnecting default connection...
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Reconnecting default connection...
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default connection established, continuing with the test
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#
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# Delete all existing binary logs.
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#
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RESET MASTER;
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#
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# Create a test table.
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#
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CREATE TABLE t1 (
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c1 LONGTEXT
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) ENGINE=MyISAM DEFAULT CHARSET latin1;
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#
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# Show how many rows are affected by each statement.
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#
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#
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# Insert some big rows.
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#
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64MB
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INSERT INTO t1 VALUES (REPEAT('ManyMegaByteBlck', 4194304));
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affected rows: 1
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32MB
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INSERT INTO t1 VALUES (REPEAT('ManyMegaByteBlck', 2097152));
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affected rows: 1
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4MB
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INSERT INTO t1 VALUES (REPEAT('ManyMegaByteBlck', 262144));
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affected rows: 1
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512KB
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INSERT INTO t1 VALUES (REPEAT('ManyMegaByteBlck', 32768));
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affected rows: 1
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#
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# Show what we have in the table.
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# Do not display the column value itself, just its length.
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#
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SELECT LENGTH(c1) FROM t1;
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LENGTH(c1) 67108864
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LENGTH(c1) 33554432
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LENGTH(c1) 4194304
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LENGTH(c1) 524288
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affected rows: 4
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#
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# Grow the rows by updating.
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#
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UPDATE t1 SET c1 = CONCAT(c1, c1);
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affected rows: 4
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info: Rows matched: 4 Changed: 4 Warnings: 0
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#
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# Show what we have in the table.
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# Do not display the column value itself, just its length.
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#
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SELECT LENGTH(c1) FROM t1;
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LENGTH(c1) 134217728
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LENGTH(c1) 1048576
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LENGTH(c1) 67108864
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LENGTH(c1) 8388608
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affected rows: 4
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#
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# Delete the rows.
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#
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DELETE FROM t1 WHERE c1 >= 'ManyMegaByteBlck';
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affected rows: 4
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#
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# Hide how many rows are affected by each statement.
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#
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#
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# Flush all log buffers to the log file.
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#
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FLUSH LOGS;
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#
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# Call mysqlbinlog to display the log file contents.
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# NOTE: The output of mysqlbinlog is redirected to
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# $MYSQLTEST_VARDIR/tmp/mysqlbinlog_big_1.out
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# If you want to examine it, disable remove_file
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# at the bottom of the test script.
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#
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#
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# Cleanup.
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#
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# reset variable value to pass testcase checks
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SET @@global.max_allowed_packet = 1048576;
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DROP TABLE t1;
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remove_file $MYSQLTEST_VARDIR/tmp/mysqlbinlog_big_1.out
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