mysqli_free_result() is slow when all the data are not read while using MYSQLI_USE_RESULT
I am using MYSQLI_USE_RESULT(Unbuffered query) while querying a huge data from the table.
For testing I took a table of 5.6 GB size.
I selected all columns Select * from test_table.
If I am not reading any rows with method like fetch_assoc() etc. Then try to close the result with mysqli_free_result(). It takes 5 to 10 secs to close it.
Sometimes I read required number rows based on available memory. And then I call mysqli_free_result() it takes less time when compared with not even one row is read.
So lesser unread rows means lesser time to free results. More unread rows more time to free results.
It's no where documented that this functionality will consume time in best of my knowledge.
Time taken for query is around 0.0008 sec.
Is it bug or is it expected behavior?
For me this sluggishness defeating whole point using MYSQLI_USE_RESULT.
MySQL v5.7.21, PHP v7.2.4 used for testing.
Alias of this function are mysqli_result::free -- mysqli_result::close -- mysqli_result::free_result -- mysqli_free_result.
php mysql optimization mysqli database-performance
edited Nov 16 '18 at 8:12
kit
1,10631017
asked Nov 16 '18 at 6:46
itsoft3gitsoft3g
3291527
add a comment |
I am using MYSQLI_USE_RESULT(Unbuffered query) while querying a huge data from the table.
For testing I took a table of 5.6 GB size.
I selected all columns Select * from test_table.
If I am not reading any rows with method like fetch_assoc() etc. Then try to close the result with mysqli_free_result(). It takes 5 to 10 secs to close it.
Sometimes I read required number rows based on available memory. And then I call mysqli_free_result() it takes less time when compared with not even one row is read.
So lesser unread rows means lesser time to free results. More unread rows more time to free results.
It's no where documented that this functionality will consume time in best of my knowledge.
Time taken for query is around 0.0008 sec.
Is it bug or is it expected behavior?
For me this sluggishness defeating whole point using MYSQLI_USE_RESULT.
MySQL v5.7.21, PHP v7.2.4 used for testing.
Alias of this function are mysqli_result::free -- mysqli_result::close -- mysqli_result::free_result -- mysqli_free_result.
php mysql optimization mysqli database-performance
edited Nov 16 '18 at 8:12
kit
1,10631017
asked Nov 16 '18 at 6:46
itsoft3gitsoft3g
3291527
add a comment |
I am using MYSQLI_USE_RESULT(Unbuffered query) while querying a huge data from the table.
For testing I took a table of 5.6 GB size.
I selected all columns Select * from test_table.
If I am not reading any rows with method like fetch_assoc() etc. Then try to close the result with mysqli_free_result(). It takes 5 to 10 secs to close it.
Sometimes I read required number rows based on available memory. And then I call mysqli_free_result() it takes less time when compared with not even one row is read.
So lesser unread rows means lesser time to free results. More unread rows more time to free results.
It's no where documented that this functionality will consume time in best of my knowledge.
Time taken for query is around 0.0008 sec.
Is it bug or is it expected behavior?
For me this sluggishness defeating whole point using MYSQLI_USE_RESULT.
MySQL v5.7.21, PHP v7.2.4 used for testing.
Alias of this function are mysqli_result::free -- mysqli_result::close -- mysqli_result::free_result -- mysqli_free_result.
php mysql optimization mysqli database-performance
edited Nov 16 '18 at 8:12
kit
1,10631017
asked Nov 16 '18 at 6:46
itsoft3gitsoft3g
3291527
I am using MYSQLI_USE_RESULT(Unbuffered query) while querying a huge data from the table.
For testing I took a table of 5.6 GB size.
I selected all columns Select * from test_table.
If I am not reading any rows with method like fetch_assoc() etc. Then try to close the result with mysqli_free_result(). It takes 5 to 10 secs to close it.
Sometimes I read required number rows based on available memory. And then I call mysqli_free_result() it takes less time when compared with not even one row is read.
So lesser unread rows means lesser time to free results. More unread rows more time to free results.
It's no where documented that this functionality will consume time in best of my knowledge.
Time taken for query is around 0.0008 sec.
Is it bug or is it expected behavior?
For me this sluggishness defeating whole point using MYSQLI_USE_RESULT.
MySQL v5.7.21, PHP v7.2.4 used for testing.
Alias of this function are mysqli_result::free -- mysqli_result::close -- mysqli_result::free_result -- mysqli_free_result.
php mysql optimization mysqli database-performance
php mysql optimization mysqli database-performance
edited Nov 16 '18 at 8:12
kit
1,10631017
asked Nov 16 '18 at 6:46
itsoft3gitsoft3g
3291527
edited Nov 16 '18 at 8:12
kit
1,10631017
asked Nov 16 '18 at 6:46
itsoft3gitsoft3g
3291527
edited Nov 16 '18 at 8:12
kit
1,10631017
edited Nov 16 '18 at 8:12
kit
1,10631017
edited Nov 16 '18 at 8:12
kit
1,10631017
1,10631017
asked Nov 16 '18 at 6:46
itsoft3gitsoft3g
3291527
asked Nov 16 '18 at 6:46
itsoft3gitsoft3g
3291527
asked Nov 16 '18 at 6:46
itsoft3gitsoft3g
3291527
3291527
add a comment |
add a comment |
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