Just give a try!!!
mysql> select version();
+------------+
| version() |
+------------+
| 5.5.21-log |
+------------+
1 row in set (0.00 sec)
mysql> show variables like "%innodb_file%";
+--------------------------+----------+
| Variable_name | Value |
+--------------------------+----------+
| innodb_file_format | Antelope |
| innodb_file_format_check | ON |
| innodb_file_format_max | Antelope |
| innodb_file_per_table | ON |
+--------------------------+----------+
4 rows in set (0.00 sec)
mysql> SET GLOBAL innodb_file_format = barracuda;
Query OK, 0 rows affected (0.00 sec)
mysql> show variables like "%innodb_file%";
+--------------------------+-----------+
| Variable_name | Value |
+--------------------------+-----------+
| innodb_file_format | Barracuda |
| innodb_file_format_check | ON |
| innodb_file_format_max | Antelope |
| innodb_file_per_table | ON |
+--------------------------+-----------+
4 rows in set (0.00 sec)
mysql> SET GLOBAL innodb_file_format_max = barracuda;
Query OK, 0 rows affected (0.00 sec)
mysql> show variables like "%innodb_file%";
+--------------------------+-----------+
| Variable_name | Value |
+--------------------------+-----------+
| innodb_file_format | Barracuda |
| innodb_file_format_check | ON |
| innodb_file_format_max | Barracuda |
| innodb_file_per_table | ON |
+--------------------------+-----------+
4 rows in set (0.00 sec)
I had observed a single line logged in Error Log file :
[root@dhcppc0 Desktop]# tail -1 /usr/local/mysql/data/dhcppc0.err
120402 11:26:52 [Info] InnoDB: the file format in the system tablespace is
now set to Barracuda.
After switching to barracuda file format, I could also access my Database
and tables without any error :
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| opentaps1 |
| performance_schema |
| test |
+--------------------+
5 rows in set (0.00 sec)
mysql> use opentaps1;
Database changed
mysql> select count(*) from product;
+----------+
| count(*) |
+----------+
| 3244 |
+----------+
1 row in set (0.42 sec)
mysql> show engines;
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| Engine | Support | Comment | Transactions | XA | Savepoints |
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| MRG_MYISAM | YES | Collection of identical MyISAM tables | NO | NO | NO |
| CSV | YES | CSV storage engine | NO | NO | NO |
| MyISAM | YES | MyISAM storage engine | NO | NO | NO |
| BLACKHOLE | YES | /dev/null storage engine (anything you write to it disappears) | NO | NO | NO |
| MEMORY | YES | Hash based, stored in memory, useful for temporary tables | NO | NO | NO |
| InnoDB | DEFAULT | Supports transactions, row-level locking, and foreign keys | YES | YES | YES |
| ARCHIVE | YES | Archive storage engine | NO | NO | NO |
| PERFORMANCE_SCHEMA | YES | Performance Schema | NO | NO | NO |
| FEDERATED | NO | Federated MySQL storage engine | NULL | NULL | NULL |
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
9 rows in set (0.00 sec)
mysql> show engine innodb status\G
*************************** 1. row ***************************
Type: InnoDB
Name:
Status:
=====================================
120402 11:36:29 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 18446744073709534037 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 12 1_second, 12 sleeps, 1 10_second, 2 background,
2 flush
srv_master_thread log flush and writes: 12
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 5, signal count 5
Mutex spin waits 2, rounds 60, OS waits 2
RW-shared spins 3, rounds 90, OS waits 3
RW-excl spins 0, rounds 0, OS waits 0
Spin rounds per wait: 30.00 mutex, 30.00 RW-shared, 0.00 RW-excl
------------
TRANSACTIONS
------------
Trx id counter F01
Purge done for trx's n:o < 0 undo n:o < 0
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION F00, not started
MySQL thread id 1, OS thread handle 0x7f38309f9710, query id 28 localhost
root
show engine innodb status
--------
FILE I/O
--------
I/O thread 0 state: waiting for completed aio requests (insert buffer
thread)
I/O thread 1 state: waiting for completed aio requests (log thread)
I/O thread 2 state: waiting for completed aio requests (read thread)
I/O thread 3 state: waiting for completed aio requests (read thread)
I/O thread 4 state: waiting for completed aio requests (read thread)
I/O thread 5 state: waiting for completed aio requests (read thread)
I/O thread 6 state: waiting for completed aio requests (write thread)
I/O thread 7 state: waiting for completed aio requests (write thread)
I/O thread 8 state: waiting for completed aio requests (write thread)
I/O thread 9 state: waiting for completed aio requests (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
554 OS file reads, 7 OS file writes, 7 OS fsyncs
-0.01 reads/s, 16384 avg bytes/read, -0.00 writes/s, -0.00 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 0, seg size 2, 0 merges
merged operations:
insert 0, delete mark 0, delete 0
discarded operations:
insert 0, delete mark 0, delete 0
Hash table size 276707, node heap has 15 buffer(s)
-0.15 hash searches/s, -0.12 non-hash searches/s
---
LOG
---
Log sequence number 221536390
Log flushed up to 221536390
Last checkpoint at 221536390
0 pending log writes, 0 pending chkp writes
10 log i/o's done, -0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total memory allocated 137363456; in additional pool allocated 0
Dictionary memory allocated 3476070
Buffer pool size 8192
Free buffers 7635
Database pages 542
Old database pages 220
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 542, created 0, written 1
-0.01 reads/s, -0.00 creates/s, -0.00 writes/s
Buffer pool hit rate 980 / 1000, young-making rate 0 / 1000 not 0 / 1000
Pages read ahead -0.00/s, evicted without access -0.00/s, Random read ahead
-0.00/s
LRU len: 542, unzip_LRU len: 0
I/O sum[0]:cur[238], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
1 read views open inside InnoDB
Main thread process no. 2937, id 139879303665424, state: waiting for server
activity
Number of rows inserted 0, updated 0, deleted 0, read 3244
-0.00 inserts/s, -0.00 updates/s, -0.00 deletes/s, -0.18 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================
1 row in set (0.00 sec)