As you may mention,my website always displays ‘service unavailable’ with no predictions.Indubitably it is caused by high CPU and memory utilization on my shared hosting server that I had talked for many times.
That messed me up because I tried thousands ways to optimize my blog in order to prevent the issue occurring,but failed all the time.Recently I visited a lot of support forums which are concerning on WordPress Platform and I found that there are a number of people who meet the same problem with me.They all pointed the problem into database.
So I checked it out by phpMyAdmin and saw the sizes of some data are unwonted and redundant,especially under wp_option which is 1.3MB.I deleted some unnecessary lines and cron to clean up the database and went back to Option-Permanent links to update it.Then I checked again under wp_option,there has been down into 200KB only.
I refresh my blog for many times and till now it works nicely.I hope when you meet ‘service unavailable’ issue here,leave your words to me so that I can keep monitoring and going to fix the issue as soon as possible.And if you have any idea to help me do better regarding to that matter,you’re most welcome!
May I be lucky forever! 
Hello…I have seen and heard a lot about wordpress but not exactly read about it. I also have try to install it together with the mysql but I have failed. So my request is do you think you have the time to do a guideline with graphics together for noob like me?I have no idea where to start with. Or can I have your email address to contact you? Hope to get your reply soon. Thanks in advance~
I dint meet this situation before in your blog… hehe… ^^ Keep it up ya~~~
Don't worry, so long i am in your blog for so long and i also met service unavilable one time only. Ok, if my blog service unavailable, i will you de la si fu~ ^^