Re: [HACKERS] [PATCHES] ALTER TABLE ... SET TABLESPACE
I'm rewriting the patch so don't worry :-) Thanks, Gavin On Mon, 21 Jun 2004, Mark Kirkwood wrote: I don't know if this provides any more info than you already have - but is my last few lines from a single process backend run with valgrind : ==19666== Syscall param write(buf) contains uninitialised or unaddressable byte(s) ==19666==at 0x404D94F8: __GI___libc_write (in /lib/libc-2.3.2.so) ==19666==by 0x80934F8: XLogFlush (xlog.c:1414) ==19666==by 0x8090723: RecordTransactionCommit (xact.c:550) ==19666==by 0x8090BC0: CommitTransaction (xact.c:931) ==19666==Address 0x4219236A is not stack'd, malloc'd or free'd backend 1: oid (typeid = 26, len = 4, typmod = -1, byval = t) 2: nspname (typeid = 19, len = 64, typmod = -1, byval = f) 3: relname (typeid = 19, len = 64, typmod = -1, byval = f) ==19666== ==19666== Invalid write of size 4 ==19666==at 0x8109B00: DLMoveToFront (dllist.c:237) ==19666==by 0x81B2EB5: SearchCatCache (catcache.c:1155) ==19666==by 0x81B7D72: GetSysCacheOid (syscache.c:606) ==19666==by 0x81B8C7A: get_relname_relid (lsyscache.c:879) ==19666==Address 0xCC3D5C04 is not stack'd, malloc'd or free'd Segmentation fault Gavin Sherry wrote: On Sun, 20 Jun 2004, Tatsuo Ishii wrote: Attached is a patch implementing this functionality. I've modified make_new_heap() as well as swap_relfilenodes() to not assume that tablespaces remain the same from old to new heap. I thought it better to go down this road than introduce a lot of duplicate code. I have tried your patches and it works great. Thanks. One thing I noticed was if I change tablespace for a table having indexes, they are left in the old tablespace and the table itself was moved to the new tablespace. I regard this is a good thing since I could assign different table spaces for table and indexes. It would be even better to assign different tablespaces for each index. Hm. It seems there's a problem with tablespaces. What I did was: pgbench -i test alter table accounts set tablespace mydb2; \d accounts backend crashes by signal 11... !DSPAM:40d66cf4282571539216297! ---(end of broadcast)--- TIP 8: explain analyze is your friend
[HACKERS] email browser?
What's the safest email browser? ---(end of broadcast)--- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
Re: [HACKERS] [PATCHES] ALTER TABLE ... SET TABLESPACE
I don't know if this provides any more info than you already have - but is my last few lines from a single process backend run with valgrind : ==19666== Syscall param write(buf) contains uninitialised or unaddressable byte(s) ==19666==at 0x404D94F8: __GI___libc_write (in /lib/libc-2.3.2.so) ==19666==by 0x80934F8: XLogFlush (xlog.c:1414) ==19666==by 0x8090723: RecordTransactionCommit (xact.c:550) ==19666==by 0x8090BC0: CommitTransaction (xact.c:931) ==19666==Address 0x4219236A is not stack'd, malloc'd or free'd backend 1: oid (typeid = 26, len = 4, typmod = -1, byval = t) 2: nspname (typeid = 19, len = 64, typmod = -1, byval = f) 3: relname (typeid = 19, len = 64, typmod = -1, byval = f) ==19666== ==19666== Invalid write of size 4 ==19666==at 0x8109B00: DLMoveToFront (dllist.c:237) ==19666==by 0x81B2EB5: SearchCatCache (catcache.c:1155) ==19666==by 0x81B7D72: GetSysCacheOid (syscache.c:606) ==19666==by 0x81B8C7A: get_relname_relid (lsyscache.c:879) ==19666==Address 0xCC3D5C04 is not stack'd, malloc'd or free'd Segmentation fault Gavin Sherry wrote: On Sun, 20 Jun 2004, Tatsuo Ishii wrote: Attached is a patch implementing this functionality. I've modified make_new_heap() as well as swap_relfilenodes() to not assume that tablespaces remain the same from old to new heap. I thought it better to go down this road than introduce a lot of duplicate code. I have tried your patches and it works great. Thanks. One thing I noticed was if I change tablespace for a table having indexes, they are left in the old tablespace and the table itself was moved to the new tablespace. I regard this is a good thing since I could assign different table spaces for table and indexes. It would be even better to assign different tablespaces for each index. Hm. It seems there's a problem with tablespaces. What I did was: pgbench -i test alter table accounts set tablespace mydb2; \d accounts backend crashes by signal 11... ---(end of broadcast)--- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
Re: [HACKERS] email browser?
On Fri, 2004-06-18 at 22:47, Santo Quartarone wrote: What's the safest email browser? telnet mailserver.domain.tld 110 ---(end of broadcast)--- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly ... John ---(end of broadcast)--- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
[HACKERS] Stuff I'm working on
Hi, Since I'm waiting for someone to comment on my last question about dump ordering for grant and owner statements, what I think I'll do is submit a patch first (to get in before feature freeze) that adds all the OWNER TO commands, docs and regression tests. It will also do RENAME and OWNER on tablespaces. Then, if I have time I'll fix grant dump ordering for june 30, otherwise it _may_ have to wait for the beta period. Since you can consider the current state of pg_dump to be buggy, is it ok to fix it after feature freeze? Also, I'd love to get pg_dumpall binary format dumping in by feature freeze, but I don't know if I'll make it. I guess that's more of a feature than a bug though. I got the pg_get_serial_sequence function in early so that no initdb would be needed during beta... Chris ps. Please someone comment on my last question about pg_dump grant ordering! Thanks! ---(end of broadcast)--- TIP 7: don't forget to increase your free space map settings
[HACKERS] placeholder syntax
PostgreSQL currently uses $1/$2 for placeholders in prepared statements. I'm writing something that may potentially submit queries to both Oracle and Postgres, and it seems Oracle doesn't accept this syntax. Someone on IRC said I could use ? for both Oracle and Postgres. It isn't entirely clear to me if Oracle accepts it, but Postgres doesn't seem to. My copy of the SQL92 standard says: «In SQL-statements that are executed dynamically, the parameters are called dynamic parameters (dynamic parameter specifications) and are represented in SQL language by a question mark (?).» (There's also an embedded variable name production in the standard, which looks like the :foo syntax that Oracle also accepts, but I'm not sure it applies to placeholders. The standard is a bit hard to read.) Should Postgres accept ? as a placeholder? (If so, I'll dig around and try to figure out how to make it do so.) -- ams ---(end of broadcast)--- TIP 8: explain analyze is your friend
Re: [HACKERS] placeholder syntax
Abhijit Menon-Sen [EMAIL PROTECTED] writes: Should Postgres accept ? as a placeholder? We think it's an operator character: regression=# select 1 ? 4; ERROR: operator does not exist: integer ? integer I count eighteen standard operators that would be broken if we changed '?' to mean a parameter. I am also pretty unclear on why '?' is a good notation for parameters, seeing that it is very hard for either the user or the machine to tell which is which when there are multiple parameters. In short, I think this notation sucks and I don't want to emulate it. We do have the :foo notation in ecpg, which may be your closest parallel for handling Oracle-workalike code anyway. regards, tom lane ---(end of broadcast)--- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
Re: [HACKERS] Compile failure with SSL
Dave Page wrote: OK, looks like the error below is a Win32 thing. The patch attached #ifdef'd out the permissions check on the private key file as it won't work under Windows anyway (a similar check in postmaster.c has has already been ifdef'd out for the same reason). Incidently, the consts are also used in initdb.c where they work just fine - can't seem to figure out where it gets them from though (must be missing something). Normally they're in sys/stat.h, but not in mingw (where they can only be found in glibc/sys/stat.h). Magnus also mentioned to me that Merlin's snapshots are building fine without this patch - dunno if he has a different version of sys/stat.h... Anyway, regardless of that I think the patch is relevant. I had made the same changes as you to be_secure...(actually, I recently stopped doing that, I need to update the snapshot info page). The real problem is that the SSL based connection does not receive signals while waiting on select() like the regular connection does. IMO, the SSL patch should not be applied until this has been resolved. Merlin ---(end of broadcast)--- TIP 9: the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
Re: [HACKERS] placeholder syntax
Tom Lane [EMAIL PROTECTED] writes: Abhijit Menon-Sen [EMAIL PROTECTED] writes: Should Postgres accept ? as a placeholder? In short, I think this notation sucks and I don't want to emulate it. Certainly it sucks. Unfortunately it's the supported ODBC API which is emulated by everyone else, including JDBC and DBI. So the world's pretty much stuck with it. However this isn't Postgres's problem. If you want to write code that works with multiple databases then you're going to want to be using something like ODBC or JDBC or DBI anyways. In which case it's the driver's responsibility to provide the standard API which includes translating ? into appropriate syntax for the database. In other words, your problem should already be solved by your driver. -- greg ---(end of broadcast)--- TIP 2: you can get off all lists at once with the unregister command (send unregister YourEmailAddressHere to [EMAIL PROTECTED])
Re: [HACKERS] placeholder syntax
Greg Stark wrote: Tom Lane [EMAIL PROTECTED] writes: Abhijit Menon-Sen [EMAIL PROTECTED] writes: Should Postgres accept ? as a placeholder? In short, I think this notation sucks and I don't want to emulate it. Certainly it sucks. Unfortunately it's the supported ODBC API which is emulated by everyone else, including JDBC and DBI. So the world's pretty much stuck with it. However this isn't Postgres's problem. If you want to write code that works with multiple databases then you're going to want to be using something like ODBC or JDBC or DBI anyways. In which case it's the driver's responsibility to provide the standard API which includes translating ? into appropriate syntax for the database. This brings back memories. This is how the whole Access hack for the parse-time transformation of '= NULL' to 'IS NULL' came about. IIRC, older versions of Access would invoke SQLPrepare() with a statement like: SELECT * FROM employees WHERE employeeid = ? then invoke SQLBindParameter() with NULL as the value, followed by SQLExecute() and the backend would receive: SELECT * FROM employees WHERE employeeid = NULL Later versions of one of the Access components (jet, mdac, access.exe - who knows where) changed its behavior and never performed similarly... Mike Mascari ---(end of broadcast)--- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]
Re: [HACKERS] placeholder syntax
Personally, I agree. The '?' sucks for multiple reasons. The major reason being when you want to use the same parameter in more than one place in a statement. Another reason is query rewrites where you have to reorganize the actual order of parameters. You are then forced to first convert the '?' into some other form (like the $1, $2 syntax that PostgreSQL uses today). But even if it sucks, it's used by a very broad range of clients. As Greg mentions, both ODBC and JDBC uses this syntax and no other SQL database that I know of treats '?' as an operator. The '?' is, and will remain, a parameter placeholder in SQL for most people. So even if '?' shouldn't be emulated at this time, perhaps it would be a good idea to abandon it as a valid operator? Kind regards, Thomas Hallgren Greg Stark [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Tom Lane [EMAIL PROTECTED] writes: Abhijit Menon-Sen [EMAIL PROTECTED] writes: Should Postgres accept ? as a placeholder? In short, I think this notation sucks and I don't want to emulate it. Certainly it sucks. Unfortunately it's the supported ODBC API which is emulated by everyone else, including JDBC and DBI. So the world's pretty much stuck with it. However this isn't Postgres's problem. If you want to write code that works with multiple databases then you're going to want to be using something like ODBC or JDBC or DBI anyways. In which case it's the driver's responsibility to provide the standard API which includes translating ? into appropriate syntax for the database. In other words, your problem should already be solved by your driver. -- greg ---(end of broadcast)--- TIP 2: you can get off all lists at once with the unregister command (send unregister YourEmailAddressHere to [EMAIL PROTECTED]) ---(end of broadcast)--- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
[HACKERS] creating a cluster
Does anyone have any new ways to create clusters without using initdb or bootstrap mode? I need to be able to create one without those 2 things. Any ideas? thanks! Alex ---(end of broadcast)--- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
Re: [HACKERS] creating a cluster
On Mon, Jun 21, 2004 at 09:16:35PM -0400, Alexander Cohen wrote: Does anyone have any new ways to create clusters without using initdb or bootstrap mode? I need to be able to create one without those 2 things. Any ideas? initdb'ing somewhere else and copying the resulting directory? -- Alvaro Herrera (alvherre[a]dcc.uchile.cl) Find a bug in a program, and fix it, and the program will work today. Show the program how to find and fix a bug, and the program will work forever (Oliver Silfridge) ---(end of broadcast)--- TIP 2: you can get off all lists at once with the unregister command (send unregister YourEmailAddressHere to [EMAIL PROTECTED])
Re: [HACKERS] creating a cluster
Alexander Cohen [EMAIL PROTECTED] writes: Does anyone have any new ways to create clusters without using initdb or bootstrap mode? I need to be able to create one without those 2 things. Any ideas? Perhaps you should explain *why* you think you need this? regards, tom lane ---(end of broadcast)--- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faqs/FAQ.html
