Re: [Firebird-devel] isc_dpb_lc_ctype and isc_dpb_set_db_charset and isc_dpb_utf8_filename
Thanks. I suppose not only TPB, but also buffers for batch, events, etc., right? Basically only DPB and SPB are "UTF8-ready". -- Mgr. Jiří Činčura https://www.tabsoverspaces.com/ On Mon, Feb 28, 2022, at 15:21, Alex Peshkoff via Firebird-devel wrote: > On 2/28/22 13:38, Jiří Činčura wrote: >> Does the isc_dpb_utf8_filename imply also UTF8 strings in TPB (i.e. for >> table names used with isc_tpb_lock_write, etc.)? >> > > They are expected in attachment charset. > > > > > Firebird-Devel mailing list, web interface at > https://lists.sourceforge.net/lists/listinfo/firebird-devel Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
Re: [Firebird-devel] Compiled statement cache
On 28/02/2022 13:18, Alex Peshkoff via Firebird-devel wrote: > I suppose it's with mentoned 2Mb cache. Yes. But it's the same even with 100K as the test uses very few and small statements. > > One more question. Suppose some statement remains in a cache for very > long time cause it's reused again and again. That's fine - but with DB > grow optimal plan can change. Is it solved somehow? Suppose in first > implementation not, Correct. And it's a problem also now when application holds prepared statement manually, but that probably is not going to be changed. > but are there plans to solve it? > I think there are two possible ways: - Timeout of cached statement (counting from its first appearance in cache, not last usage) - When engine detects a condition which could change a plan, it may ask cache for invalidation. Adriano Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
Re: [Firebird-devel] Compiled statement cache
On 2/28/22 16:54, Adriano dos Santos Fernandes wrote: On 26/02/2022 22:05, Adriano dos Santos Fernandes wrote: I will report back some numbers (memory, prepare times). Here is a performance test I did: https://pastebin.com/3UnB5BNU It's relative simple (not much indices) and common metadata. It's tested as whole (create database, create metadata, populate, run queries and get results, drop database). The last select has a statement size of 21.5KB. For reference, "select 1 from rdb$database" has size 6KB. Test timings: - Without statement cache: 19800ms - With statement cache: 16700ms More than 10% is great! I suppose it's with mentoned 2Mb cache. One more question. Suppose some statement remains in a cache for very long time cause it's reused again and again. That's fine - but with DB grow optimal plan can change. Is it solved somehow? Suppose in first implementation not, but are there plans to solve it? Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
Re: [Firebird-devel] isc_dpb_lc_ctype and isc_dpb_set_db_charset and isc_dpb_utf8_filename
On 2/28/22 13:38, Jiří Činčura wrote: Does the isc_dpb_utf8_filename imply also UTF8 strings in TPB (i.e. for table names used with isc_tpb_lock_write, etc.)? They are expected in attachment charset. Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
Re: [Firebird-devel] Compiled statement cache
On 26/02/2022 22:05, Adriano dos Santos Fernandes wrote: > > I will report back some numbers (memory, prepare times). > Here is a performance test I did: https://pastebin.com/3UnB5BNU It's relative simple (not much indices) and common metadata. It's tested as whole (create database, create metadata, populate, run queries and get results, drop database). The last select has a statement size of 21.5KB. For reference, "select 1 from rdb$database" has size 6KB. Test timings: - Without statement cache: 19800ms - With statement cache: 16700ms Adriano Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
Re: [Firebird-devel] isc_dpb_lc_ctype and isc_dpb_set_db_charset and isc_dpb_utf8_filename
On 2/28/22 13:40, Jiří Činčura wrote: Also, does the isc_dpb_utf8_filename imply UTF8 for database name in i.e. op_attach (not DPB, the name that's before DPB)? Yes. Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
Re: [Firebird-devel] isc_dpb_lc_ctype and isc_dpb_set_db_charset and isc_dpb_utf8_filename
> Also, does the isc_dpb_utf8_filename imply UTF8 for database name in > i.e. op_attach (not DPB, the name that's before DPB)? Obviously it has to. I somewhat thought the DPB contains database name as well. Silly me. -- Mgr. Jiří Činčura https://www.tabsoverspaces.com/ Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
Re: [Firebird-devel] isc_dpb_lc_ctype and isc_dpb_set_db_charset and isc_dpb_utf8_filename
Also, does the isc_dpb_utf8_filename imply UTF8 for database name in i.e. op_attach (not DPB, the name that's before DPB)? -- Mgr. Jiří Činčura https://www.tabsoverspaces.com/ Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
Re: [Firebird-devel] isc_dpb_lc_ctype and isc_dpb_set_db_charset and isc_dpb_utf8_filename
Does the isc_dpb_utf8_filename imply also UTF8 strings in TPB (i.e. for table names used with isc_tpb_lock_write, etc.)? -- Mgr. Jiří Činčura https://www.tabsoverspaces.com/ Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
Re: [Firebird-devel] isc_arg_string in status vector
On 28/02/2022 07:17, Alex Peshkoff via Firebird-devel wrote: > On 2/28/22 13:10, Jiří Činčura wrote: >> Hi *, >> >> If I get pointer to a string in isc_arg_string in status vector the >> encoding is UTF8 if isc_dpb_utf8_filename was specified and >> ANSI/system charset when isc_dpb_utf8_filename was not specified? >> > > Data in status vector should be according to attachment charset and not > affected by isc_dpb_utf8_filename. > If that's not so then it should be a bug. > > ps.In some cases error may happen when trasliterating UTF8 line to > attachment charset. In that case strig willl be returned is UTF. > But before attachment is done that does not happen and strings are returned as is (for example, error about non-existent file in Windows ANSI encoding). To convert charsets, database must be opened currently. Adriano Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
Re: [Firebird-devel] isc_dpb_lc_ctype and isc_dpb_set_db_charset and isc_dpb_utf8_filename
Jiří Činčura wrote 28.02.2022 11:16: Can somebody explain me how isc_dpb_lc_ctype and isc_dpb_set_db_charset and isc_dpb_utf8_filename relate to each other. isc_dbp_lc_ctype establish charsert for all data returned from server (unless explicitly overridden in message metadata). isc_dpb_db_charset is default database charset and used only during createDatabase(). isc_dpb_utf8_filename establish charset of DPB items themselves (and database filename obviously). -- WBR, SD. Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
Re: [Firebird-devel] isc_arg_string in status vector
On 2/28/22 13:10, Jiří Činčura wrote: Hi *, If I get pointer to a string in isc_arg_string in status vector the encoding is UTF8 if isc_dpb_utf8_filename was specified and ANSI/system charset when isc_dpb_utf8_filename was not specified? Data in status vector should be according to attachment charset and not affected by isc_dpb_utf8_filename. If that's not so then it should be a bug. ps.In some cases error may happen when trasliterating UTF8 line to attachment charset. In that case strig willl be returned is UTF. Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
[Firebird-devel] isc_dpb_lc_ctype and isc_dpb_set_db_charset and isc_dpb_utf8_filename
Hi *, Can somebody explain me how isc_dpb_lc_ctype and isc_dpb_set_db_charset and isc_dpb_utf8_filename relate to each other. In .NET provider these are used somewhat chaotically and I'd like to fix that. -- Mgr. Jiří Činčura https://www.tabsoverspaces.com/ Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
Re: [Firebird-devel] isc_arg_string in status vector
Jiří Činčura wrote 28.02.2022 11:10: If I get pointer to a string in isc_arg_string in status vector the encoding is UTF8 if isc_dpb_utf8_filename was specified and ANSI/system charset when isc_dpb_utf8_filename was not specified? It's encoding should match dpb_lc_ctype setting. isc_dpb_utf8_filename doesn't imply utf8 lc_ctype. -- WBR, SD. Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
[Firebird-devel] isc_arg_string in status vector
Hi *, If I get pointer to a string in isc_arg_string in status vector the encoding is UTF8 if isc_dpb_utf8_filename was specified and ANSI/system charset when isc_dpb_utf8_filename was not specified? -- Mgr. Jiří Činčura https://www.tabsoverspaces.com/ Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
