Re: [GENERAL] WAL being written during SELECT * query

2017-04-10 Thread Tom DalPozzo
2017-04-10 16:49 GMT+02:00 Bill Moran : > > > >> On Tue, Apr 4, 2017 at 9:46 AM, Tom DalPozzo > > >> wrote: > > >> > Hi, > > >> > I have a very big table (10GB). > > >> > I noticed that many WAL segments are being written when elaborating > read > > >> > only transactions like this: > > >> > sele

Re: [GENERAL] WAL being written during SELECT * query

2017-04-10 Thread Bill Moran
> >> On Tue, Apr 4, 2017 at 9:46 AM, Tom DalPozzo > >> wrote: > >> > Hi, > >> > I have a very big table (10GB). > >> > I noticed that many WAL segments are being written when elaborating read > >> > only transactions like this: > >> > select * from dati256 where id >4300 limit 100

Re: [GENERAL] WAL being written during SELECT * query

2017-04-10 Thread Tom DalPozzo
2017-04-06 17:51 GMT+02:00 Tom DalPozzo : > > > 2017-04-04 19:18 GMT+02:00 Scott Marlowe : > >> On Tue, Apr 4, 2017 at 9:46 AM, Tom DalPozzo >> wrote: >> > Hi, >> > I have a very big table (10GB). >> > I noticed that many WAL segments are being written when elaborating read >> > only transactions

Re: [GENERAL] WAL being written during SELECT * query

2017-04-06 Thread David G. Johnston
On Thu, Apr 6, 2017 at 8:51 AM, Tom DalPozzo wrote: > > What is the meaning of FPI_FOR_HINT? > ​ > ​Full Page Image for Hint [Bits] Its noted as being dependent upon checksums being enabled. I have a feel for the interactions involved here but not enough to explain them in detail. David J.

Re: [GENERAL] WAL being written during SELECT * query

2017-04-06 Thread Tom DalPozzo
2017-04-04 19:18 GMT+02:00 Scott Marlowe : > On Tue, Apr 4, 2017 at 9:46 AM, Tom DalPozzo wrote: > > Hi, > > I have a very big table (10GB). > > I noticed that many WAL segments are being written when elaborating read > > only transactions like this: > > select * from dati256 where id >43

Re: [GENERAL] WAL being written during SELECT * query

2017-04-04 Thread Scott Marlowe
On Tue, Apr 4, 2017 at 9:46 AM, Tom DalPozzo wrote: > Hi, > I have a very big table (10GB). > I noticed that many WAL segments are being written when elaborating read > only transactions like this: > select * from dati256 where id >4300 limit 100; > I don't understand why are there

Re: [GENERAL] WAL being written during SELECT * query

2017-04-04 Thread Raymond O'Donnell
On 04/04/17 16:46, Tom DalPozzo wrote: Hi, I have a very big table (10GB). I noticed that many WAL segments are being written when elaborating read only transactions like this: select * from dati256 where id >4300 limit 100; I don't understand why are there WAL writings during rea

[GENERAL] WAL being written during SELECT * query

2017-04-04 Thread Tom DalPozzo
Hi, I have a very big table (10GB). I noticed that many WAL segments are being written when elaborating read only transactions like this: select * from dati256 where id >4300 limit 100; I don't understand why are there WAL writings during read only transactions. Regards Pupillo