How to remove lock tables on MySQL and how to check cdc enabled on MySQL on table level pls help?

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K 2022-09-23 05:06:39
How to remove lock tables on MySQL and how to check cdc enabled on MySQL on table level pls help ????
Krishna Sarath 2022-09-23 09:26:39
Hi need a small doubt
jing Xbk 2022-09-23 09:28:05
n hao
Krishna Sarath 2022-09-23 09:30:13
One stored procedure optimization time is reduced from 4sec to 500 m sec it’s fine. But while I’m placed in another db it will get 5 sec.is any know about this plz give suggestion.
Krishna Sarath 2022-09-23 09:34:10
Krishna Sarath 2022-09-23 09:30:13
One stored procedure optimization time is reduced from 4sec to 500 m sec it’s fine. But while I’m placed in another db it will get 5 sec.is any know about this plz give suggestion.

Plz tell me

deepu017 2022-09-23 09:41:26
Anyone know how to convert cvs files from encoding utf-8 to utf-16?
svart 2022-09-23 11:15:45
Krishna Sarath 2022-09-23 09:30:13
One stored procedure optimization time is reduced from 4sec to 500 m sec it’s fine. But while I’m placed in another db it will get 5 sec.is any know about this plz give suggestion.

check environments for any differences, check query plans, profile stored procedure…

Krishna Sarath 2022-09-23 11:16:15
All are same
svart 2022-09-23 11:16:34
K 2022-09-23 05:06:39
How to remove lock tables on MySQL and how to check cdc enabled on MySQL on table level pls help ????

kill a session which holds the lock. try to lock a table. if it was already locked you won’t be able to lock it

svart 2022-09-23 11:17:12
deepu017 2022-09-23 09:41:26
Anyone know how to convert cvs files from encoding utf-8 to utf-16?

a bit coding will be required. i would suggest to google for it. a lot of converters should be available

svart 2022-09-23 11:17:50
Krishna Sarath 2022-09-23 11:16:15
All are same

i’d say that you did not check everything

Grv 2022-09-23 11:46:28
Krishna Sarath 2022-09-23 11:16:15
All are same

Number of records in the tables also matters

unmonks 2022-09-23 15:16:21
Help needed:

My table got 160 Million records.

Most of the time a simple update takes more than a minute or end with timeout.

Any expert can explain what could be the reason.

Grv 2022-09-23 15:17:57
unmonks 2022-09-23 15:16:21
Help needed:

My table got 160 Million records.

Most of the time a simple update takes more than a minute or end with timeout.

Any expert can explain what could be the reason.

Do batch updates, or use cursors

ColonelMustang 2022-09-23 15:18:16
unmonks 2022-09-23 15:16:21
Help needed:

My table got 160 Million records.

Most of the time a simple update takes more than a minute or end with timeout.

Any expert can explain what could be the reason.

Many things:

What’s the DB engine? MyIsam takes a table level lock. Use InnoDb

Do you have indexes?
How many records updated per query, etc

ColonelMustang 2022-09-23 15:18:25
Source: not an expert
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Ganesh K 2022-09-24 04:22:44
unmonks 2022-09-23 15:16:21
Help needed:

My table got 160 Million records.

Most of the time a simple update takes more than a minute or end with timeout.

Any expert can explain what could be the reason.

Is it work from work bench..then there is edit .. preferences etc..change from 30 second to maximize time like 60000..

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unmonks 2022-09-24 05:26:20
ColonelMustang 2022-09-23 15:18:16
Many things:

What’s the DB engine? MyIsam takes a table level lock. Use InnoDb

Do you have indexes?
How many records updated per query, etc

1. It’s InnoDB,
2. There are proper indexes on filter/where clause column
3. It’s only update one record per DML.

Does page-split affect the update time, because updating a null to datetime.

unmonks 2022-09-24 05:28:44
Ganesh K 2022-09-24 04:22:44
Is it work from work bench..then there is edit .. preferences etc..change from 30 second to maximize time like 60000..

Same duration on both environments.
i.e. Workbench as well as application.

unmonks 2022-09-24 05:31:23
My question is how to know or diagnosis what is the rootcause of the slow performance for any record update.
Ganesh K 2022-09-24 07:22:37
unmonks 2022-09-24 05:31:23
My question is how to know or diagnosis what is the rootcause of the slow performance for any record update.

If you execute processlisy .it gives us the commands executing currently. Example: if there are large insert then you see different insert values everytime you execute processlist

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unmonks 2022-09-25 04:52:54
Is this a new command in @mysql?
unmonks 2022-09-25 04:56:47
Ganesh K 2022-09-24 07:22:37
If you execute processlisy .it gives us the commands executing currently. Example: if there are large insert then you see different insert values everytime you execute processlist

All I have tried, but unable to identify the actual reason for slowness for the update statement.

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Hidayath Ulla 2022-09-25 11:54:55
How can I omit 0 in LEAD() and LAG() function in SQL?
Santosh Uske 2022-09-25 13:29:10
Can any one help me to solve this
Hidayath Ulla 2022-09-25 15:39:05
https://stackoverflow.com/questions/73842867/lead-and-lag-function-by-omitting-0/73843087#73843087

LEAD and LAG function by omitting 0Stack Overflow
enter image description here
I want to omit 0 while applying LEAD and LAG function.
For highlighted column, prev should be 116.69635888009 and next should be 108.324381114468
I am using the query b…
Jackibom 2022-09-25 19:44:44
mysql_en-25274.jpg
Hi guys when I try to import a dataset on MysQL, it give me this error after I click on “Start import”
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Ganesh K 2022-09-26 15:21:20
unmonks 2022-09-25 04:56:47
All I have tried, but unable to identify the actual reason for slowness for the update statement.

Is system configuration like ram and cpu same on both…also did you tried to restart the machine and tried …
Did you see any spike while running update on slow server …
Or in both machine enough drive available…
Just curious, if all the parameters like table size and cpu and ram all same …why one take more and one is less time…

Possible of locks on table in production server …but this is not here …

Vikram Kesari 2022-09-26 15:58:31
Guys, help me with interview questions? on Mysql, n errors ..
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