i'm currently migrating a DB2 database to MySQL, using
SQL WORKBENCH Tool
It basically does a select from DB2 and Insert to DB2.
It works fine, but on the tables with longblob or longtext columns (for storing xml or images) it takes a huge amount of time. (about 40 hours for a table of 10M rows).
Facts:
-
Server: 2CPU CORES and 8GB of RAM OS: Linux RHEL 6.5
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MySQL Server 5.6.13
-
Tables are InnoDB.
-
MySQL Server and the Migration tool are on the same computer so there
isn't network overhead. -
Tables on MySQL have PRIMARY KEYS but not any other indexes.
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I disabled binary log for the massive insert.
-
I configured the migration tool to do a batch insert of 10
rows and commit every insert (10 rows).
Two questions here:
- What are the values recommended for the batch insert size, considering the size of the columns (longtext, longblob)?
- Is there any tuning recommended on my.cnf to improve the insert performance?
Here's the contents of my.cnf file:
[mysqld]
open_files_limit=2048
table_open_cache=1024
query_cache_type=1
query_cache_size=64M
tmp_table_size=32M
thread_cache_size=9
default-storage-engine=INNODB
back_log=80
flush_time=0
join_buffer_size=1M
max_allowed_packet=1G
max_connect_errors=100
sort_buffer_size=256K
table_definition_cache=1400
binlog_row_event_max_size=8K
log-bin
log_bin_trust_function_creators=1
#INNODB
innodb_additional_mem_pool_size=8M
innodb_flush_log_at_trx_commit=1
innodb_data_file_path = ibdata1:5G:autoextend
innodb_log_buffer_size=16M
innodb_buffer_pool_size=6144M
innodb_log_file_size=1GB
innodb_thread_concurrency=3
innodb_autoextend_increment=64
innodb_concurrency_tickets=5000
innodb_old_blocks_time=1000
innodb_open_files=300
innodb_stats_on_metadata=0
innodb_file_per_table=1
innodb_checksum_algorithm=0
Best Answer
InnoDB Architecture (from Percona CTO Vadim Tkachenko)
Apr 20, 2011
: MySQL gives "Out of Memory" error when inserting a large file. From where is this filesize limitation arising?Apr 27, 2011
: Changed max_allowed_packet and still receiving 'Packet Too Large' errorAug 01, 2011
: How does max_allowed_packet affect the backup and restore of a database?Proposed Changes
GIVE IT A TRY !!!