Hi Ljr You might want to read through this to help you understand why it might have grown https://www.percona.com/blog/2013/08/20/why-is-the-ibdata1-file-continuously... As to it being 4GB, that isn't really a problem in itself and if the cause was a long running transaction, which it looks like with the undo files being present then you will want to find the source of that transaction to avoid a repeat. FYI i had a DB server with a 90GB ibdata1 before I moved to file_per_table and cleaned it up. Run show explain for xxx being the processid for all current processes to see if you can find what might have a stalled transaction holding the undo. Have a look through the above page for additional help to identify the culprit and if it is still there only dormant waiting for some action Cheers Peter On Thu, Aug 25, 2016 at 11:46 PM, Ljr Yang <dbmsprog@gmail.com> wrote:

Hi, All we use MariaDB 10.1.16 , about have 30 machines. Recently ,there one master and slave's ibdat1 growed to about 4GB, others machine are normal.

mainly parameter in my.cnf : innodb_data_home_dir = /data/mysql/data innodb_data_file_path = ibdata1:2G:autoextend innodb_log_files_in_group=3 innodb_log_file_size = 1G innodb_undo_logs=128 innodb_undo_tablespaces=4 innodb_file_per_table= 1

ls -l /data/mysql/data -rw-r--r-- 1 mysql mysql 4429185024 Aug 25 21:38 ibdata1 -rw-r--r-- 1 mysql mysql 1073741824 Aug 25 21:38 ib_logfile0 -rw-r--r-- 1 mysql mysql 1073741824 Aug 25 21:38 ib_logfile1 -rw-r--r-- 1 mysql mysql 1073741824 Aug 25 20:13 ib_logfile2 -rw-r--r-- 1 mysql mysql 616562688 Aug 25 21:36 undo001 -rw-r--r-- 1 mysql mysql 411041792 Aug 25 21:27 undo002 -rw-r--r-- 1 mysql mysql 708837376 Aug 25 21:34 undo003 -rw-r--r-- 1 mysql mysql 981467136 Aug 25 21:34 undo004

Today, when found the problem, there are not some big transaction in show processlist. We guess ibdata1 had growed to 4GB in previous some time, but we want to know how confirm the cause and shrink ibdate1 file ? Thank .

-- Ljr

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