Re: [GENERAL] Header meaning for pg_dump
On Tue, Nov 07, 2006 at 08:40:54AM +0700, Premsun Choltanwanich wrote: Dear Richard, Regarding the information you give to me, I understand that this information is a thing that normally used by PostgreSQL system. And the information seem to be placed on a comment area. So, Who need to have a clearly understanding on the header information? AFAIK nothing (in the main distribution) actually uses it. It's more a header for people while they're scanning the dump. It also makes a nice anchor point for sed scripts if you want to extract a single object from the dump. Have a nice day, -- Martijn van Oosterhout kleptog@svana.org http://svana.org/kleptog/ From each according to his ability. To each according to his ability to litigate. signature.asc Description: Digital signature
Re: [GENERAL] Header meaning for pg_dump
Premsun Choltanwanich wrote: Dear All, I had open the backup file of PostgreSQL created by pg_dump command. I found that pg_dump make a comment line as header for each module it backup. I try to understand the meaning of value contained on header for my sample header -- -- TOC entry 1427 (class 1259 OID 1216127) -- Dependencies: 7 -- Name: t_option; Type: TABLE; Schema: public; Owner: postgres; Tablespace: -- Could you please advise me for What does they mean? and What the value used for? I'm not sure that they're used for anything in that form - that's just documenting internal details. TOC - Table Of Contents OID - Object IDentifier - as used by PG to reference tables,functions etc. Dependencies - iirc is the number of references to this table (e.g. foreign keys). The others explain themselves. Check the manual section on system tables, and perhaps try: SELECT OID,* FROM pg_class WHERE relname='t_option' HTH -- Richard Huxton Archonet Ltd ---(end of broadcast)--- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
Re: [GENERAL] Header meaning for pg_dump
Dear Richard, Regardingthe information you give to me, I understand that this information is a thing that normally used by PostgreSQL system.Andthe informationseem to be placed on a comment area. So,Who need to have a clearly understanding on the header information? Thank you Richard Huxton dev@archonet.com 11/6/2006 15:41 Premsun Choltanwanich wrote: Dear All, I had open the backup file of PostgreSQL created by pg_dump command. I found that pg_dump make a comment line as header for each module it backup. I try to understand the meaning of value contained on header for my sample header -- -- TOC entry 1427 (class 1259 OID 1216127) -- Dependencies: 7 -- Name: t_option; Type: TABLE; Schema: public; Owner: postgres; Tablespace: -- Could you please advise me for What does they mean? and What the value used for?I'm not sure that they're used for anything in that form - that's just documenting internal details.TOC - Table Of ContentsOID - Object IDentifier - as used by PG to reference tables,functions etc.Dependencies - iirc is the number of references to this table (e.g. foreign keys).The others explain themselves.Check the manual section on system tables, and perhaps try: SELECT OID,* FROM pg_class WHERE relname='t_option'HTH-- Richard Huxton Archonet Ltd NETsolutions Asia Limited +66 (2) 237 7247
[GENERAL] Header meaning for pg_dump
Dear All, I had open the backup file of PostgreSQL created by pg_dump command. I found that pg_dump make a comment line as header for each module it backup. I try to understand the meaning of value contained on header for my sample header TOC entry 1427 (class 1259 OID 1216127)-- Dependencies: 7-- Name: t_option; Type: TABLE; Schema: public; Owner: postgres; Tablespace: -- Could you please advise me for What does they mean? and What the value used for? Thank You. NETsolutions Asia Limited +66 (2) 237 7247
