Re: [GENERAL] PQexec does not return.
Hi Martin, I have got same problem as mentioned by you. As per your comment it seems this problem is due to memory leak. Could you explain the exact reason of this problem. How it is related to mem-leak. Regards Thanks -Shalendra On Jan 15, 3:51 pm, [EMAIL PROTECTED] (Steve Martin) wrote: Hi All, Found the problem. This was caused by a memory leak in our application. Regards Steve Martin Steve Martin wrote: Hi All, We have an intermittent problem where PQexec does not seem to return even though the server seems to have sent the results. From the gdb output , the sql statement can be seen, and from the log, the result can be seen to be sent. Both process are running on the same machine. Version of postgres and other info: 1. Postgres Version 8.1.4 2. Machine HP rx4640 3. OS: HPUX 11.23 4. Mem 8G Has anyone seen this type of problem before, can it be cause by a TCP/IP communication failure? From gdb: % /opt/langtools/bin/gdb /path/name -p 3587 HP gdb 5.2 for HP Itanium (32 or 64 bit) and target HP-UX 11.2x. Copyright 1986 - 2001 Free Software Foundation, Inc. Hewlett-Packard Wildebeest 5.2 (based on GDB) is covered by the GNU General Public License. Type show copying to see the conditions to change it and/or distribute copies. Type show warranty for warranty/support. .. Attaching to program: /path/name, process 3587 warning: No unwind information found. Skipping this library /usr/lib/hpux32/libcl.so.1. 0x6000c0342810:0 in _poll_sys+0x30 () from /usr/lib/hpux32/libc.so.1 (gdb) bt #0 0x6000c0342810:0 in _poll_sys+0x30 () from /usr/lib/hpux32/libc.so.1 #1 0x6000c03553e0:0 in poll+0x160 () from /usr/lib/hpux32/libc.so.1 #2 0x6000cefa75b0:0 in pqSocketCheck+0xb00 () from /usr/local/pgsql/lib/libpq.so.4 #3 0x6000cefa77c0:0 in pqWaitTimed+0x40 () from /usr/local/pgsql/lib/libpq.so.4 #4 0x6000cefa7890:0 in pqWait+0x40 () from /usr/local/pgsql/lib/libpq.so.4 #5 0x6000cefa53b0:0 in PQgetResult+0x180 () from /usr/local/pgsql/lib/libpq.so.4 #6 0x6000cefa56f0:0 in PQexecFinish+0x40 () from /usr/local/pgsql/lib/libpq.so.4 #7 0x6000c1c83870:0 in DBIFPostgreSelect::getRecord (this=0x40114840) at DBIFPostgre.C:1688 #8 0x6000c1c73d20:0 in DBIFPostgreSelect::selectNext (this=0x40114840, [EMAIL PROTECTED]) at DBIFPostgre.C:1902 #9 0x6000c1c64b90:0 in DBIFSelect::selectNext (this=0x7fff5240, [EMAIL PROTECTED]) at DBIF.C:2704 #10 0x404ff00:0 in TableStatus::checkDeferredTR (this=0x403104c0) at DbSContTable.C:1468 #11 0x405b430:0 in TableStatusManager::checkDeferredTR (this=0x400bde90) at DbSContTable.C:3146 #12 0x4068960:0 in Controller::go (this=0x7fffc320) at DbSController.C:1950 #13 0x406b1b0:0 in main (argc=1, argv=0x7fffed74) at DbSContMain.C:137 (gdb) q The program is running. Quit anyway (and detach it)? (y or n) y Detaching from program: /path/name, process 3587 % /opt/langtools/bin/gdb /path/name -p 3587 HP gdb 5.2 for HP Itanium (32 or 64 bit) and target HP-UX 11.2x. Copyright 1986 - 2001 Free Software Foundation, Inc. Hewlett-Packard Wildebeest 5.2 (based on GDB) is covered by the GNU General Public License. Type show copying to see the conditions to change it and/or distribute copies. Type show warranty for warranty/support. .. Attaching to program: /path/name, process 3587 warning: No unwind information found. Skipping this library /usr/lib/hpux32/libcl.so.1. 0x6000c0342810:0 in _poll_sys+0x30 () from /usr/lib/hpux32/libc.so.1 (gdb) up #1 0x6000c03553e0:0 in poll+0x160 () from /usr/lib/hpux32/libc.so.1 (gdb) up #2 0x6000cefa75b0:0 in pqSocketCheck+0xb00 () from /usr/local/pgsql/lib/libpq.so.4 (gdb) up #3 0x6000cefa77c0:0 in pqWaitTimed+0x40 () from /usr/local/pgsql/lib/libpq.so.4 (gdb) up #4 0x6000cefa7890:0 in pqWait+0x40 () from /usr/local/pgsql/lib/libpq.so.4 (gdb) up #5 0x6000cefa53b0:0 in PQgetResult+0x180 () from /usr/local/pgsql/lib/libpq.so.4 (gdb) up #6 0x6000cefa56f0:0 in PQexecFinish+0x40 () from /usr/local/pgsql/lib/libpq.so.4 (gdb) up #7 0x6000c1c83870:0 in DBIFPostgreSelect::getRecord (this=0x40114840) at DBIFPostgre.C:1688 1688myResultExecPrepare = PQexec(myConnection-conn, seleStmt); (gdb) p seleStmt $1 = SELECT * FROM T_AM_TERM_BILLING WHERE (TR_STATUS = 'DEFERRED') AND ((DOWNLOAD_DATE 20070108) OR ((DOWNLOAD_DATE = 20070108) AND
Re: [GENERAL] PQexec does not return.
Hi All, Found the problem. This was caused by a memory leak in our application. Regards Steve Martin Steve Martin wrote: Hi All, We have an intermittent problem where PQexec does not seem to return even though the server seems to have sent the results. From the gdb output , the sql statement can be seen, and from the log, the result can be seen to be sent. Both process are running on the same machine. Version of postgres and other info: 1. Postgres Version 8.1.4 2. Machine HP rx4640 3. OS: HPUX 11.23 4. Mem 8G Has anyone seen this type of problem before, can it be cause by a TCP/IP communication failure? From gdb: % /opt/langtools/bin/gdb /path/name -p 3587 HP gdb 5.2 for HP Itanium (32 or 64 bit) and target HP-UX 11.2x. Copyright 1986 - 2001 Free Software Foundation, Inc. Hewlett-Packard Wildebeest 5.2 (based on GDB) is covered by the GNU General Public License. Type show copying to see the conditions to change it and/or distribute copies. Type show warranty for warranty/support. .. Attaching to program: /path/name, process 3587 warning: No unwind information found. Skipping this library /usr/lib/hpux32/libcl.so.1. 0x6000c0342810:0 in _poll_sys+0x30 () from /usr/lib/hpux32/libc.so.1 (gdb) bt #0 0x6000c0342810:0 in _poll_sys+0x30 () from /usr/lib/hpux32/libc.so.1 #1 0x6000c03553e0:0 in poll+0x160 () from /usr/lib/hpux32/libc.so.1 #2 0x6000cefa75b0:0 in pqSocketCheck+0xb00 () from /usr/local/pgsql/lib/libpq.so.4 #3 0x6000cefa77c0:0 in pqWaitTimed+0x40 () from /usr/local/pgsql/lib/libpq.so.4 #4 0x6000cefa7890:0 in pqWait+0x40 () from /usr/local/pgsql/lib/libpq.so.4 #5 0x6000cefa53b0:0 in PQgetResult+0x180 () from /usr/local/pgsql/lib/libpq.so.4 #6 0x6000cefa56f0:0 in PQexecFinish+0x40 () from /usr/local/pgsql/lib/libpq.so.4 #7 0x6000c1c83870:0 in DBIFPostgreSelect::getRecord (this=0x40114840) at DBIFPostgre.C:1688 #8 0x6000c1c73d20:0 in DBIFPostgreSelect::selectNext (this=0x40114840, [EMAIL PROTECTED]) at DBIFPostgre.C:1902 #9 0x6000c1c64b90:0 in DBIFSelect::selectNext (this=0x7fff5240, [EMAIL PROTECTED]) at DBIF.C:2704 #10 0x404ff00:0 in TableStatus::checkDeferredTR (this=0x403104c0) at DbSContTable.C:1468 #11 0x405b430:0 in TableStatusManager::checkDeferredTR (this=0x400bde90) at DbSContTable.C:3146 #12 0x4068960:0 in Controller::go (this=0x7fffc320) at DbSController.C:1950 #13 0x406b1b0:0 in main (argc=1, argv=0x7fffed74) at DbSContMain.C:137 (gdb) q The program is running. Quit anyway (and detach it)? (y or n) y Detaching from program: /path/name, process 3587 % /opt/langtools/bin/gdb /path/name -p 3587 HP gdb 5.2 for HP Itanium (32 or 64 bit) and target HP-UX 11.2x. Copyright 1986 - 2001 Free Software Foundation, Inc. Hewlett-Packard Wildebeest 5.2 (based on GDB) is covered by the GNU General Public License. Type show copying to see the conditions to change it and/or distribute copies. Type show warranty for warranty/support. .. Attaching to program: /path/name, process 3587 warning: No unwind information found. Skipping this library /usr/lib/hpux32/libcl.so.1. 0x6000c0342810:0 in _poll_sys+0x30 () from /usr/lib/hpux32/libc.so.1 (gdb) up #1 0x6000c03553e0:0 in poll+0x160 () from /usr/lib/hpux32/libc.so.1 (gdb) up #2 0x6000cefa75b0:0 in pqSocketCheck+0xb00 () from /usr/local/pgsql/lib/libpq.so.4 (gdb) up #3 0x6000cefa77c0:0 in pqWaitTimed+0x40 () from /usr/local/pgsql/lib/libpq.so.4 (gdb) up #4 0x6000cefa7890:0 in pqWait+0x40 () from /usr/local/pgsql/lib/libpq.so.4 (gdb) up #5 0x6000cefa53b0:0 in PQgetResult+0x180 () from /usr/local/pgsql/lib/libpq.so.4 (gdb) up #6 0x6000cefa56f0:0 in PQexecFinish+0x40 () from /usr/local/pgsql/lib/libpq.so.4 (gdb) up #7 0x6000c1c83870:0 in DBIFPostgreSelect::getRecord (this=0x40114840) at DBIFPostgre.C:1688 1688myResultExecPrepare = PQexec(myConnection-conn, seleStmt); (gdb) p seleStmt $1 = SELECT * FROM T_AM_TERM_BILLING WHERE (TR_STATUS = 'DEFERRED') AND ((DOWNLOAD_DATE 20070108) OR ((DOWNLOAD_DATE = 20070108) AND (DOWNLOAD_TIME 203744))), '\000' repeats 43 times (gdb) q The program is running. Quit anyway (and detach it)? (y or n) y Detaching from program: /path/name, process 3587 From postgres log 2007-01-08 20:37:44.839 NZDT [EMAIL PROTECTED]LOG: statement: select pg_get_indexdef(indexrelid) from pg_index where ind relid = ( select oid from pg_class where relname = 't_am_registration_db') 2007-01-08 20:37:44.840 NZDT [EMAIL PROTECTED]LOG: duration: 0.347 ms
