Tema: Re: MySQL FIFO queue
Autorius: rl
Data: 2010-05-28 13:05:06
Nu tai pirmam thread'ui uzrakinus visa lentele, antras thread'as negales 
select'o padaryti (jei kokio dirty read'o neijungsi priverstinai su NOLOCK).

On 2010.05.28 12:19, 2x50 wrote:
> Tada klausima toks - kaip sita problema pades isspresti visos lenteles blokavimas vietoj vieno iraso blokavimo?
>
> "rl"<ask@me.for>  wrote in message news:htl6se$vgm$1@trimpas.omnitel.net...
>> UPDATE Jobs
>>     SET InUseBy = 'Jonas'
>> WHERE DateCreated = (SELECT MIN(DateCreated) FROM Jobs WHERE InUseBy IS NULL)
>>
>> 1. Paleidi 2 tokius pacius update'us vienu metu
>> 2. 1-as ivykdo (SELECT MIN(DateCreated) FROM Jobs WHERE InUseBy IS NULL). Gauna DateCreated  reiksme
>> 3. 2-as ivykdo (SELECT MIN(DateCreated) FROM Jobs WHERE InUseBy IS NULL) gauna ta pacia DateCreated reiksme
>> 4. 1-as uzsilockina update'inimui konkretu irasa
>> 5. 2-as bando lockinti ta pati irasa ir laukia
>> 6. 1-as pakeicia InUseBy = 'Jonas' ir paleidzia lock'a
>> 7. 2-as uzsilockina irasa, pakeicia InUseBy = 'Petras' ir paleidzia.
>>
>> Galima situacija?
>
>