diff options
| -rw-r--r-- | doc/src/sgml/config.sgml | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml index 958b41c1387..1adbba7f8f4 100644 --- a/doc/src/sgml/config.sgml +++ b/doc/src/sgml/config.sgml @@ -1824,9 +1824,10 @@ include_dir 'conf.d' (such as a sort or hash table) before writing to temporary disk files. If this value is specified without units, it is taken as kilobytes. The default value is four megabytes (<literal>4MB</literal>). - Note that for a complex query, several sort or hash operations might be - running in parallel; each operation will generally be allowed - to use as much memory as this value specifies before it starts + Note that a complex query might perform several sort and hash + operations at the same time, with each operation generally being + allowed to use as much memory as this value specifies before + it starts to write data into temporary files. Also, several running sessions could be doing such operations concurrently. Therefore, the total memory used could be many times the value @@ -1840,7 +1841,7 @@ include_dir 'conf.d' <para> Hash-based operations are generally more sensitive to memory availability than equivalent sort-based operations. The - memory available for hash tables is computed by multiplying + memory limit for a hash table is computed by multiplying <varname>work_mem</varname> by <varname>hash_mem_multiplier</varname>. This makes it possible for hash-based operations to use an amount of memory |