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| pboro | atrofast, geotools stuff progressing well? :) | 03:41 |
|---|---|---|
| atrofast | pboro: pretty well, there seems to be a bug in MVCC and LOB handling that needs resolving | 03:48 |
| pboro | nice to hear | 03:50 |
| atrofast | Yeah... oh how familiar are you with JDBC and LOBs anyway pboro? Can you actually insert a LONG VARCHAR longer than 32000 bytes NOT using PreparedStatements? | 04:00 |
| pboro | as far as I know, you can't | 04:00 |
| atrofast | So you gotta use PreparedStatements for LOBs the neh? | 04:01 |
| pboro | yup | 04:01 |
| pboro | I usually only use prepared statements for the security they provided by using placeholders | 04:02 |
| atrofast | Good to know... I wrote a second driver for GeoTools (utilizing much of the first one) last night but to use Prepared Statements instead... was pretty sure something like that would come up :) | 04:02 |
| atrofast | How does performance compare? | 04:02 |
| atrofast | prepared vs not prepared | 04:02 |
| pboro | well the server needs to "prepare" the statement any way, you just get a possibility to reuse the once already prepared statement...if you're using statement pooling, the jdbc pooling library can keep the statements in a "pooled cache" | 04:03 |
| pboro | so you should get benefits in that case, since the statement only needs to be prepared once for each connection | 04:04 |
| pboro | pooling libraries like c3p0 and apache dbcp support also pooling the statements, which is nice | 04:05 |
| pboro | but of course there's a small penalty in using preparedstatement since the statement will be "stored" for a while etc., but if you really need performance you will need to use prepared statement to make them cacheable/poolable | 04:05 |
| pboro | I might be wrong, but this is how I understand and do it :) | 04:06 |
| pboro | of course you can also reuse the statements in your code, without a caching/pooling library between your application and jdbc driver | 04:07 |
| atrofast | That makes sense... I'm not sure what kind of strategy GeoTools uses if it's pooling... But I guess it's a moot point since I need to prepare my statements in case the geometries are large | 04:09 |
| pboro | mostly the pooling library is put between the application and the jdbc driver and the software doesn't take any part in it | 04:10 |
| pboro | the library just works as a caching layer | 04:10 |
| pboro | you can use it or leave it out, either way you like | 04:10 |
| pboro | in some cases it's a must, like some high volume web applications | 04:11 |
| pboro | all java web application frameworks only use prepared statements, like Spring Framework | 04:11 |
| pboro | so... I would really go with the prepared ones :) | 04:11 |
| atrofast | Thanks for the input, very useful :) Yeah looking over the other drivers, Oracle has ONLY a PreparedStatement driver. Postgres has both... MySQL and SQLServer has no Prepared Statement driver | 04:15 |
| pboro | prepared statements is something that MySQL lacked a long time even for PHP | 04:15 |
| pboro | MySQL 5.1+ does support prepared statements in it's JDBC driver | 04:16 |
| pboro | maybe older too, can't find good source on the versions right now... | 04:17 |
| pboro | support for prepared statements on the server side was added in 4.1 | 04:17 |
| pboro | hehe, some statistics: http://euedge.com/blog/2007/11/11/prepared-statement-performance-in-mysql/ | 04:18 |
| pboro | not too good test tho' | 04:19 |
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| atrofast | Are there any Ingres benchmarks similar to that? | 05:07 |
| pboro | nope... if I had some spare time, I would be glad to make one | 05:08 |
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| atrofast | just something that would be interesting at this point, not resting any key decisions on it or anything :) | 05:11 |
| pboro | it would be interesting to see the effect of cache_dynamic = ON too | 05:11 |
| atrofast | yes agreed | 05:15 |
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| thiagomz | Guys... I am trying to migrate a 2.6 legacy database to 10.0 Community edition.... I got a lot of this : E_CO003F COPY: Warning: 51543 rows not copied because duplicate key | 10:58 |
| thiagomz | detected | 10:58 |
| thiagomz | Anyone has i ideia why ? | 10:58 |
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