From ca71c6619086ac3b6e3787c2826363faeab02ac9 Mon Sep 17 00:00:00 2001 From: Bruce Momjian Date: Thu, 15 Feb 2001 22:21:23 +0000 Subject: [PATCH] Update FAQ. --- doc/FAQ | 39 ++++++++++++++++++++++++++++----------- doc/src/FAQ/FAQ.html | 43 ++++++++++++++++++++++++++++++++----------- 2 files changed, 60 insertions(+), 22 deletions(-) diff --git a/doc/FAQ b/doc/FAQ index 083c3938cc..14c328eeda 100644 --- a/doc/FAQ +++ b/doc/FAQ @@ -83,12 +83,14 @@ other users? 4.17) What is an OID? What is a TID? 4.18) What is the meaning of some of the terms used in PostgreSQL? - 4.19) How do I tell what PostgreSQL version I am running? - 4.20) My large-object operations get invalid large obj descriptor. + 4.19) Why do I get the error "ERROR: Memory exhausted in + AllocSetAlloc()?" + 4.20) How do I tell what PostgreSQL version I am running? + 4.21) My large-object operations get invalid large obj descriptor. Why? - 4.21) How do I create a column that will default to the current time? - 4.22) Why are my subqueries using IN so slow? - 4.23) How do I perform an outer join? + 4.22) How do I create a column that will default to the current time? + 4.23) Why are my subqueries using IN so slow? + 4.24) How do I perform an outer join? Extending PostgreSQL @@ -97,7 +99,7 @@ 5.2) How can I contribute some nifty new types and functions to PostgreSQL? 5.3) How do I write a C function to return a tuple? - 5.4) I have changed a source file. Why does the recompile not see the + 5.3) I have changed a source file. Why does the recompile not see the change? _________________________________________________________________ @@ -883,11 +885,26 @@ BYTEA bytea variable-length byte array (null-safe) A list of general database terms can be found at: http://www.comptechnews.com/~reaster/dbdesign.html - 4.19) How do I tell what PostgreSQL version I am running? + 4.19) Why do I get the error "ERROR: Memory exhausted in AllocSetAlloc()?" + + It is possible you have run out of virtual memory on your system, or + your kernel has a low limit for certain resources. Try this before + starting the postmaster: + ulimit -d 262144 + limit datasize 256m + + Depending on your shell, only one of these may succeed, but it will + set your process data segment limit much higher and perhaps allow the + query to complete. This command applies to the current process, and + all subprocesses created after the command is run. If you are having a + problem with the SQL client because the backend is returning too much + data, try it before starting the client. + + 4.20) How do I tell what PostgreSQL version I am running? From psql, type select version(); - 4.20) My large-object operations get invalid large obj descriptor. Why? + 4.21) My large-object operations get invalid large obj descriptor. Why? You need to put BEGIN WORK and COMMIT around any use of a large object handle, that is, surrounding lo_open ... lo_close. @@ -901,12 +918,12 @@ BYTEA bytea variable-length byte array (null-safe) If you are using a client interface like ODBC you may need to set auto-commit off. - 4.21) How do I create a column that will default to the current time? + 4.22) How do I create a column that will default to the current time? Use now(): CREATE TABLE test (x int, modtime timestamp DEFAULT now() ); - 4.22) Why are my subqueries using IN so slow? + 4.23) Why are my subqueries using IN so slow? Currently, we join subqueries to outer queries by sequentially scanning the result of the subquery for each row of the outer query. A @@ -922,7 +939,7 @@ SELECT * We hope to fix this limitation in a future release. - 4.23) How do I perform an outer join? + 4.24) How do I perform an outer join? PostgreSQL 7.1 and later supports outer joins using the SQL standard syntax. Here are two examples: diff --git a/doc/src/FAQ/FAQ.html b/doc/src/FAQ/FAQ.html index 59ad51047f..61d955211e 100644 --- a/doc/src/FAQ/FAQ.html +++ b/doc/src/FAQ/FAQ.html @@ -127,15 +127,17 @@ TID?
4.18) What is the meaning of some of the terms used in PostgreSQL?
- 4.19) How do I tell what PostgreSQL version I + 4.19) Why do I get the error "ERROR: + Memory exhausted in AllocSetAlloc()?"
+ 4.20) How do I tell what PostgreSQL version I am running?
- 4.20) My large-object operations get + 4.21) My large-object operations get invalid large obj descriptor. Why?
- 4.21) How do I create a column that will + 4.22) How do I create a column that will default to the current time?
- 4.22) Why are my subqueries using + 4.23) Why are my subqueries using IN so slow?
- 4.23) How do I perform an outer join?
+ 4.24) How do I perform an outer join?
@@ -147,7 +149,7 @@ and functions to PostgreSQL?
5.3) How do I write a C function to return a tuple?
- 5.4) I have changed a source file. Why does the + 5.3) I have changed a source file. Why does the recompile not see the change?
@@ -1132,13 +1134,32 @@ BYTEA bytea variable-length byte array (null-safe)

A list of general database terms can be found at: http://www.comptechnews.com/~reaster/dbdesign.html

-

4.19) How do I tell what PostgreSQL version +

4.19) Why do I get the error "ERROR: + Memory exhausted in AllocSetAlloc()?"
+

+ +

It is possible you have run out of virtual memory on your + system, or your kernel has a low limit for certain resources. Try + this before starting the postmaster:

+
+    ulimit -d 262144
+    limit datasize 256m
+
+ Depending on your shell, only one of these may succeed, but it will + set your process data segment limit much higher and perhaps allow + the query to complete. This command applies to the current process, + and all subprocesses created after the command is run. If you are + having a problem with the SQL client because the + backend is returning too much data, try it before starting the + client. + +

4.20) How do I tell what PostgreSQL version I am running?

From psql, type select version();

-

4.20) My large-object operations get +

4.21) My large-object operations get invalid large obj descriptor. Why?

@@ -1155,7 +1176,7 @@ BYTEA bytea variable-length byte array (null-safe)

If you are using a client interface like ODBC you may need to set auto-commit off.

-

4.21) How do I create a column that will +

4.22) How do I create a column that will default to the current time?

@@ -1165,7 +1186,7 @@ BYTEA bytea variable-length byte array (null-safe) -

4.22) Why are my subqueries using +

4.23) Why are my subqueries using IN so slow?

@@ -1188,7 +1209,7 @@ BYTEA bytea variable-length byte array (null-safe) We hope to fix this limitation in a future release. -

4.23) How do I perform an outer join?
+

4.24) How do I perform an outer join?

PostgreSQL 7.1 and later supports outer joins using the SQL -- 2.40.0