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Real Chess Online is a chess game that ca Chess Timer - Chess Clock - Online Chess Timer - Online Chess Clock. A Chess Timer that is free and easy to use. The Online Chess Timer can be used full screen and Live and correspondence chess games, free online chess games database, monthly chess tournaments, chess puzzles and chess tactics, play online chess and more! WORLD ONLINE #1 I've been investigating a slower than desired site and made a few changes. This evening I was learning about setting innodb_file_size and the logs for MySQL 8.0.30 on Ubuntu Server 22.04 pointed me to the fact it's now deprecated and we should now use innodb_redo_log_capacity. I set this new property to 4G and my site is so much faster. If you're not aware of this change in MySQL server I suggest researching it. Here is an article that may be of interest in my google research learning about it. Dynamic InnoDB Redo log Resize MySQL 8.0.30 Tired of downtimes and planning to resize your redo log files in MySQL ( InnoDB)? Here we can find a smile on our faces! The latest release of MySQL 8.0.30 ( 2022-07-26 ) has added the Onlin… mydbops.wordpress.com #2 That page no longer exists #3 That page no longer exists Dynamic InnoDB Redo log Resize MySQL 8.0.30 Tired of downtimes and planning to resize your redo log files in MySQL ( InnoDB)? Here we can find a smile on our faces! The latest release of MySQL 8.0.30 ( 2022-07-26 ) has added the Onlin… web.archive.org Sim Well-known member #4 I've been looking at the new innodb_redo_log_capacity setting and trying to find some guidance on how to optimise this.The most useful information I've found so far is: do note that you will see warning messages in the MySQL error log if your redo log capacity is too small, for example: [Warning] [MY-013865] [InnoDB] Redo log writer is waiting for a new redo log file. Consider increasing innodb_redo_log_capacity. They also suggest a query that could be used to calculate the optimal redo log capacity (to be run at peak traffic time): Code: select VARIABLE_VALUE from performance_schema.global_status where VARIABLE_NAME='Innodb_redo_log_current_lsn' into @a;select sleep(60) into @garb; select VARIABLE_VALUE from performance_schema.global_status where VARIABLE_NAME='Innodb_redo_log_current_lsn' into @b;select format_bytes(abs(@a - @b)) per_min, format_bytes(abs(@a - @b)*60) per_hour; ... it takes 60 seconds to excecute and will calculate the log capacity used per minute and by extrapolation, per hour.On my sites, the results suggest that the default of 100M is plenty large enough (noting that traffic is actually pretty quiet at the moment over the Christmas period).I'd be curious to see what results other people see on their sites. #5 Hmmm I remember spending some time computing ideal log file sizes a while back, guess this is as good as any time to review it.Running @Sim's snippet, I get the following:On the current primary: Code: +----------+------------+| per_min | per_hour |+----------+------------+| 8.01 MiB | 480.42 MiB |+----------+------------+ On a replica I get roughly the same.And looking at the now legacy variables in my config: Code: # InnoDB tx log file ( tl;dr experiment shows a minute of production write logs is approx 272MB# divided by 2 (files in group) is ~135MB# rounded to next power-of-two is 256MBinnodb_log_file_size=256Minnodb_log_files_in_group=2 So it seems that while a nice addition, it works out to a fairly similar value Sim Well-known member #7 The values automatically configured by innodb_dedicated_server seem prettyComments
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2025-03-27#1 I've been investigating a slower than desired site and made a few changes. This evening I was learning about setting innodb_file_size and the logs for MySQL 8.0.30 on Ubuntu Server 22.04 pointed me to the fact it's now deprecated and we should now use innodb_redo_log_capacity. I set this new property to 4G and my site is so much faster. If you're not aware of this change in MySQL server I suggest researching it. Here is an article that may be of interest in my google research learning about it. Dynamic InnoDB Redo log Resize MySQL 8.0.30 Tired of downtimes and planning to resize your redo log files in MySQL ( InnoDB)? Here we can find a smile on our faces! The latest release of MySQL 8.0.30 ( 2022-07-26 ) has added the Onlin… mydbops.wordpress.com #2 That page no longer exists #3 That page no longer exists Dynamic InnoDB Redo log Resize MySQL 8.0.30 Tired of downtimes and planning to resize your redo log files in MySQL ( InnoDB)? Here we can find a smile on our faces! The latest release of MySQL 8.0.30 ( 2022-07-26 ) has added the Onlin… web.archive.org Sim Well-known member #4 I've been looking at the new innodb_redo_log_capacity setting and trying to find some guidance on how to optimise this.The most useful information I've found so far is: do note that you will see warning messages in the MySQL error log if your redo log capacity is too small, for example: [Warning] [MY-013865] [InnoDB] Redo log writer is waiting for a new redo log file. Consider increasing innodb_redo_log_capacity. They also suggest a query that could be used to calculate the optimal redo log capacity (to be run at peak traffic time): Code: select VARIABLE_VALUE from performance_schema.global_status where VARIABLE_NAME='Innodb_redo_log_current_lsn' into @a;select sleep(60) into @garb; select VARIABLE_VALUE from performance_schema.global_status where VARIABLE_NAME='Innodb_redo_log_current_lsn' into @b;select format_bytes(abs(@a - @b)) per_min, format_bytes(abs(@a - @b)*60) per_hour; ... it takes 60 seconds to excecute and will calculate the log capacity used per minute and by extrapolation, per hour.On my sites, the results suggest that the default of 100M is plenty large enough (noting that traffic is actually pretty quiet at the moment over the Christmas period).I'd be curious to see what results other people see on their sites. #5 Hmmm I remember spending some time computing ideal log file sizes a while back, guess this is as good as any time to review it.Running @Sim's snippet, I get the following:On the current primary: Code: +----------+------------+| per_min | per_hour |+----------+------------+| 8.01 MiB | 480.42 MiB |+----------+------------+ On a replica I get roughly the same.And looking at the now legacy variables in my config: Code: # InnoDB tx log file ( tl;dr experiment shows a minute of production write logs is approx 272MB# divided by 2 (files in group) is ~135MB# rounded to next power-of-two is 256MBinnodb_log_file_size=256Minnodb_log_files_in_group=2 So it seems that while a nice addition, it works out to a fairly similar value Sim Well-known member #7 The values automatically configured by innodb_dedicated_server seem pretty
2025-04-07Why is there a chess clock in tournaments? And why a chess timer should be learned as well?If you are new in playing chess, you may not be familiar with chess games having time limits.It would be very inconvenient and sometimes annoying if we will have to wait long hours for our opponent to make their 6th move of the game… 🙂That is why it was a great decision from chess experts or organizers to require chess games to have a chess clock during a game.This is mostly beneficial for chess tournaments. Just imagine having 100 chess players competing without a timer or a chess clock.Now, if you are a beginner and don't have any idea how or what are the rules in playing with a chess clock.You are in luck because this article is exactly for you…Nowadays, chess organizers or any chess tournament would need you to at least know how to operate a chess clock and even understand important chess clock rules.Read the 33 important chess clock rules you need to follow.Table of ContentsWhat is a digital or analog chess clocks?1. Check your chess clock if it is silent2. You need to check your Flag3. Claim a Flag to win4. Chess clock or Checkmate5. The chess clock can start without you6. Find out the time limit7. Pressing a chess clock button is part of a move8. Hovering over a chess clock is not allowed9. Press the chess clock button with your hand10. You can stop the clock after an illegal move11. Placement of the chess clock in a game12. You should be able to see the chess clock properly13. Explain and discuss the operation of the chess clock14. Do not pick up the chess clock15. The chess clocks should be manipulation proof16. Know the time mode of the chess clock17. A chess clock and Chess notation18. Adjusting a chess piece without your chess clock running19. Chess clock can be replaced during a game20. You must stop the chess clock21. You can or cannot use your chess clock22. Asking to change to a better chess clock when late23. You cannot stop your chess clock except for valid reasons24. Stop the chess clock even after winning25. Always check for chess clock glitches26. The digital clock is mostly preferred in the chess tournament27. Chess clock time delay control28. Chess clock increment timing control29. Chess clock blitz chess timing control30. Chess clock bullet chess timing control31. Chess clock quick chess timing control32. Chess clock standard chess timing control33. Chess clock multiple time controlWrapping UpWhat is a digital or analog chess clocks?Digital or Analog Chess clocks that are used in a chess game consists of two clocks that are adjacent to each other, the purpose is to have two chess players have a specific set of time that can be tracked during a game.The chess clock has two buttons for each clock, and the buttons will stop one clock and starts the other clock vice versa.Chess players will have to move and then
2025-04-10