• 목록
• 답변
• 글쓰기
• 게시판 리스트 옵션
  • 수정
  • 삭제

• 페이스북 공유
• 트위터 공유
• 

It is imperative to maintain the speed and performance of your organization's database. Doing this is essential not only just for your clients but also to ensure the smooth functioning of your company's day-to-day tasks.

Slow responses lead to losses, so make sure you're conducting Performance V Kapseln Preis tuning in SQL MySQL from time to time. Before you get to tuning, however, consider the three vital areas you should monitor, which we're going to talk about in this article. We will also mention some ways to resolve problems if the metrics indicate an issue.

Let's start with indexes. When your indexes work as quickly as they're supposed to, the system remains efficient, but if the indexes are affected by an issue, the entire database performance gets affected.

The first metric to monitor in terms of indexes is the fill factor - the setting tasked with instructing each index to fill a page to a certain percentage. Although users may assume each page must be filled to a hundred percent, doing so is highly likely to cause page splits, which may create performance issues due to the rise in the quantity of IO operations.

And while page splits increase the chances of fragmentation, a page with too much space leads to resource wastage, again hurting performance. Therefore, the best thing to do is avoid both situations, by refraining from setting a system-wide value. Take a look at every index and decide the fill factor separately.

Next comes fragmentation, so don't pick that Oracle query optimizer tool just yet. Index fragmentation takes place due to the insertion and deletion of records by users. Such tasks are unavoidable in an organizational database's daily operations, but fragmentation certainly has a negative impact on performance. It creates issues like -

● Slower scans and needless memory usage because of excessive blank space.

● Lack of order when new pages are added due to lack of space on the older ones. This makes it difficult and time-consuming for the server to locate data.

In such cases, running Rebuild or Reorganize helps as they will clear away the fragmented indexes: Rebuild adds a new index and gets rid of extra empty spaces, whereas Reorganize rearranges the leaf pages to make searching easier for the server.

Buffer Cache is the next area where we need to monitor a few metrics because users get quicker response times when the pages are read in the buffer cache. On the other hand, performance lags if the disk ends up getting traversed by the server due to additional steps.

To start with, keep checking the PLE or Page Life Expectancy, which basically means the length of time a page exists in the buffer cache and remains uncalled before it's returned to the disk. Adjusting PLE involves raising it to boost performance, but the memory gets affected in return.

This can hurt performance if the memory is required for other tasks, so think about the amount of memory that can be safely utilized without having a negative performance effect on another task, like SQL tuning for Oracle.

Also, consider the buffer cache hit ratio as it's the ratio between the percentage of pages existing in the buffer pool and page requests. This ratio needs to be over ninety to maintain optimal results, as disk reading gets eliminated in such cases.

However, analyze data related to this metric carefully as a bit of a drop in the ratio doesn't necessarily mean there's an issue. Assess the information with respect to PLE to find out in case there really is a performance problem.



Query Optimization, our third area of consideration, involves queries that are lagging and not performing up to the mark, forming one of the most common database issues. Statements may not be performing as intended due to several reasons, making it tough to rule out a particular cause fast. Still, there are a few ways to enhance query performance without major effort, when done early in the investigation.

Check index scan for any issues that need to be addressed on a regular basis, even more so when the queries get slower than usual. At the same time, index scans running more frequently than required also damage performance. This is because index scans take longer than index seeks as scanning involves going through each row in search of useful information.

The tip to follow here in case of performance tuning in SQL MySQL is to make your query optimizer seek indexes more instead of scanning them every single time.








Are you looking for an automated database tuning solution? Tosska Technologies has the right answer. Our SQL performance tuning tools are automatic and super easy to use. They can help you find the root cause of a problem and improve the overall database performance.