Grails database is not persist - mysql

Question

Grails database is not persist after server restart,in my data source file i have following code.
please check where is i am missing.
EDIT:
dataSource {
pooled = true
driverClassName = "com.mysql.jdbc.Driver"
username = "admin"
password = "admin"
}
hibernate {
cache.use_second_level_cache = true
cache.use_query_cache = false
cache.region.factory_class = 'net.sf.ehcache.hibernate.EhCacheRegionFactory'
}
// environment specific settings
environments {
development {
dataSource {
dbCreate = "update"
url = "jdbc:mysql://localhost/mydb?useUnicode=yes&characterEncoding=UTF- 8&zeroDateTimeBehavior=convertToNull"
pooled = true
properties {
maxActive = -1
minEvictableIdleTimeMillis=1800000
timeBetweenEvictionRunsMillis=1800000
numTestsPerEvictionRun=3
testOnBorrow=true
testWhileIdle=true
testOnReturn=true
validationQuery="SELECT 1"
}
}
hibernate {
show_sql = false
}
}
test {
dataSource {
dbCreate = "update"
url = "jdbc:mysql://localhost/mydb?useUnicode=yes&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull"
pooled = true
properties {
maxActive = -1
minEvictableIdleTimeMillis=1800000
timeBetweenEvictionRunsMillis=1800000
numTestsPerEvictionRun=3
testOnBorrow=true
testWhileIdle=true
testOnReturn=true
validationQuery="SELECT 1"
}
}
hibernate {
show_sql = false
}
}
production {
dataSource {
dbCreate = "update"
url = "jdbc:mysql://localhost/mydb?useUnicode=yes&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull"
pooled = true
properties {
maxActive = -1
minEvictableIdleTimeMillis=1800000
timeBetweenEvictionRunsMillis=1800000
numTestsPerEvictionRun=3
testOnBorrow=true
testWhileIdle=true
testOnReturn=true
validationQuery="SELECT 1"
}
}
}
}
but when i restart server then hole database is drop.any suggestion please.
Thanks in advance.