Re: [GENERAL] Serializable Isolation and read/write conflict with index and different keys

2017-09-06 Thread Luca Looz
I have inserted a row that i don't touch, runned ANALYZE and tried again but with the same result. I'm using postgres 9.6.3 and EXPLAIN ANALYZE shows this: Index Scan using users_username_idx on users (cost=0.13..8.14 rows=1 width=4) (actual time=0.020..0.020 rows=0 loops=1) Index Cond: (nam

Re: [GENERAL] Serializable Isolation and read/write conflict with index and different keys

2017-09-06 Thread Luca Looz
I thinking that i have found the culprit. SSI locks leaf pages on the btree index so if the different values are covered by the same page i will get a serialization failure Is this correct? On mer 30 ago 2017, 08:45 Luca Looz wrote: > I have inserted a row that i don't touch, runned ANALYZE and

Re: [GENERAL] Serializable Isolation and read/write conflict with index and different keys

2017-08-29 Thread Thomas Munro
On Wed, Aug 30, 2017 at 4:28 AM, Luca Looz wrote: > I'm trying to use the serializable isolation but i'm getting read/write > dependencies error even if i have an unique index on the column used and the > transactions are using different keys. > For an example see this gist: > https://gist.github.

[GENERAL] Serializable Isolation and read/write conflict with index and different keys

2017-08-29 Thread Luca Looz
I'm trying to use the serializable isolation but i'm getting read/write dependencies error even if i have an unique index on the column used and the transactions are using different keys. For an example see this gist: https://gist.github.com/nathanl/f98450014f62dcaf0405394a0955e18e Is this an expec