Losing connection when querying the database
Hi,
I have a MySQL 5.5 server installed on a Windows Server 2008 R2 64-bit host with 6 GB of RAM. I only have two databases on here, one is approximately 1 GB large and the other one is around 4.5 GB large.
I'm having trouble with the larger one and I can't seem to do a consistency check on it properly.
I run: mysqlcheck.exe -u root -p db_name
And after about 15 minutes I get this error message:
C:\Program Files\MySQL\MySQL Server 5.5\bin\mysqlcheck.exe: Got error: 2013: Lost connection to MySQL server during query when executing 'CHECK TABLE ... '
Also when I try to dump the database with this command:
mysqldump.exe -u root -p db_name > db_name.sql
I get this:
mysqldump: Error 2013: Lost connection to MySQL server during query when dumping table `tablename` at row: 17457397
At some points MySQL has crashed and I've been forced to start it up again.
When I executed this command on the server:
mysql> SHOW ENGINE INNODB STATUS;
I get this:
=====================================
140109 14:32:10 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 3 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 78 1_second, 78 sleeps, 7 10_second, 8 background, 8 flush
srv_master_thread log flush and writes: 78
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 7, signal count 7
Mutex spin waits 5, rounds 34, OS waits 0
RW-shared spins 7, rounds 210, OS waits 7
RW-excl spins 0, rounds 0, OS waits 0
Spin rounds per wait: 6.80 mutex, 30.00 RW-shared, 0.00 RW-excl
------------
TRANSACTIONS
------------
Trx id counter AC7625C
Purge done for trx's n:o < AC3ED01 undo n:o < 0
History list length 122
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 0, not started, OS thread id 8812
MySQL thread id 111, query id 1311 localhost ::1 root
SHOW ENGINE INNODB STATUS
---TRANSACTION AC7625B, not started, OS thread id 9164
MySQL thread id 144, query id 1310 localhost 127.0.0.1 name
---TRANSACTION AC7623C, not started, OS thread id 7932
MySQL thread id 142, query id 1263 localhost 127.0.0.1 name
---TRANSACTION AC7623B, not started, OS thread id 10156
MySQL thread id 133, query id 1204 localhost 127.0.0.1 name
---TRANSACTION AC7621C, not started, OS thread id 9872
MySQL thread id 131, query id 1157 localhost 127.0.0.1 name
---TRANSACTION AC7621B, not started, OS thread id 9376
MySQL thread id 122, query id 1098 localhost 127.0.0.1 name
---TRANSACTION AC761FC, not started, OS thread id 7156
MySQL thread id 120, query id 1051 localhost 127.0.0.1 name
---TRANSACTION AC761FB, not started, OS thread id 9820
MySQL thread id 102, query id 963 localhost 127.0.0.1 name
---TRANSACTION AC761CB, not started, OS thread id 6068
MySQL thread id 83, query id 753 localhost 127.0.0.1 name
--------
FILE I/O
--------
I/O thread 0 state: wait Windows aio (insert buffer thread)
I/O thread 1 state: wait Windows aio (log thread)
I/O thread 2 state: wait Windows aio (read thread)
I/O thread 3 state: wait Windows aio (read thread)
I/O thread 4 state: wait Windows aio (read thread)
I/O thread 5 state: wait Windows aio (read thread)
I/O thread 6 state: wait Windows aio (write thread)
I/O thread 7 state: wait Windows aio (write thread)
I/O thread 8 state: wait Windows aio (write thread)
I/O thread 9 state: wait Windows aio (write thread)
Pending normal aio reads: 0 [0, 0, 0, 0] , aio writes: 0 [0, 0, 0, 0] ,
ibuf aio reads: 0, log i/o's: 0, sync i/o's: 0
Pending flushes (fsync) log: 0; buffer pool: 0
2316 OS file reads, 11 OS file writes, 11 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 5, seg size 7, 0 merges
merged operations:
insert 0, delete mark 0, delete 0
discarded operations:
insert 0, delete mark 0, delete 0
Hash table size 1166359, node heap has 1 buffer(s)
0.00 hash searches/s, 0.00 non-hash searches/s
---
LOG
---
Log sequence number 16199340211952
Log flushed up to 16199340211952
Last checkpoint at 16199340211952
0 pending log writes, 0 pending chkp writes
12 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total memory allocated 603111424; in additional pool allocated 0
Dictionary memory allocated 162587
Buffer pool size 35968
Free buffers 33790
Database pages 2177
Old database pages 823
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 2177, created 0, written 2
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
No buffer pool page gets since the last printout
Pages read ahead 0.00/s, evicted without access 0.00/s
LRU len: 2177, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
1 read views open inside InnoDB
Main thread id 6016, state: waiting for server activity
Number of rows inserted 0, updated 0, deleted 0, read 145002
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================
And lastly this is my config.
my.ini:
[client]
port=3306
[mysql]
default-character-set=latin1
[mysqld]
port=3306
basedir="C:/Program Files/MySQL/MySQL Server 5.5/"
datadir="C:/ProgramData/MySQL/MySQL Server 5.5/Data/"
character-set-server=latin1
default-storage-engine=INNODB
sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"
max_connections=100
query_cache_size=186M
table_cache=1520
tmp_table_size=67M
thread_cache_size=38
myisam_max_sort_file_size=100G
myisam_sort_buffer_size=67M
key_buffer_size=29M
read_buffer_size=64K
read_rnd_buffer_size=256K
sort_buffer_size=256K
innodb_data_home_dir="E:/MySQL Datafiles/"
innodb_additional_mem_pool_size=23M
innodb_flush_log_at_trx_commit=1
innodb_log_buffer_size = 11M
innodb_buffer_pool_size = 562M
innodb_log_file_size = 214M
innodb_thread_concurrency=8
log-output = FILE
general_log_file = mysql_general_log_new.log
log-error = "E:/MysqlLogerrors/err.log"
I wasn't the on who installed this and the person who did isn't working here anymore so I can't consult him and MySQL is not really my cup of tea.
Is there anyone who can help me here? What's the problem? Is it MySQL or is it the OS/hardware?
Anything that can help me here is appreciated. If you need more info just tell me.
thanks,
-Patric