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Postgres FD Implementation
Commit 10e9cd22 authored by Peter Eisentraut's avatar Peter Eisentraut
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Allow default transaction isolation level (a.k.a. set session 

characteristics) to be set through GUC.
parent e4a40cc3
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Showing with 79 additions and 87 deletions
doc/src/sgml/ref/set_transaction.sgml
View file @ 10e9cd22
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/ref/set_transaction.sgml,v 1.3 2000/11/24 20:16:38 petere Exp $ -->
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/ref/set_transaction.sgml,v 1.4 2001/06/30 22:03:25 petere Exp $ -->
<refentry id="SQL-SET-TRANSACTION">
<docinfo>
<date>2000-11-24</date>
......@@ -74,6 +74,18 @@ SET SESSION CHARACTERISTICS AS TRANSACTION ISOLATION LEVEL { READ COMMITTED | SE
</para>
</refsect1>
<refsect1>
<title>Notes</title>
<para>
The session default transaction isolation level can also be set
with the command <literal>SET default_transaction_isolation =
'<replaceable>value</replaceable>'</literal> and in the
configuration file. Consult the <citetitle>Administrator's
Guide</citetitle> for more information.
</para>
</refsect1>
<refsect1 id="R1-SQL-SET-TRANSACTION-3">
<title>Compatibility</title>
......
doc/src/sgml/runtime.sgml
View file @ 10e9cd22
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.71 2001/06/30 21:15:57 darcy Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.72 2001/06/30 22:03:25 petere Exp $
-->
<Chapter Id="runtime">
......@@ -996,6 +996,29 @@ env PGOPTIONS='-c geqo=off' psql
</listitem>
</varlistentry>
<varlistentry>
<indexterm>
<primary>transaction isolation level</primary>
</indexterm>
<term>DEFAUL_TRANSACTION_ISOLATION (<type>string</type>)</term>
<listitem>
<para>
Each SQL transaction has an isolation level, which can be
either <quote>read committed</quote> or
<quote>serializable</quote>. This parameter controls what the
isolation level of each new transaction is set to. The
default is read committed.
</para>
<para>
Consult the <citetitle>PostgreSQL User's Guide</citetitle> and
the command <command>SET TRANSACTION</command> for more
information.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>DYNAMIC_LIBRARY_PATH (<type>string</type>)</term>
<listitem>
......@@ -1051,9 +1074,9 @@ dynamic_library_path = '/usr/local/lib:/home/my_project/lib:$libdir:$libdir/cont
will use the <function>fsync()</> system call in several
places to make sure that updates are physically written to
disk and do not hang around in the kernel buffer cache. This
increases the chance that a database installation will still
be usable after an operating system or hardware crash by a
large amount. (Crashes of the database server itself do
increases the chance by a large amount that a database
installation will still be usable after an operating system or
hardware crash. (Crashes of the database server itself do
<emphasis>not</> affect this consideration.)
</para>
......
src/backend/commands/variable.c
View file @ 10e9cd22
......@@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/variable.c,v 1.50 2001/06/12 22:54:05 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/variable.c,v 1.51 2001/06/30 22:03:25 petere Exp $
*
*-------------------------------------------------------------------------
*/
......@@ -46,9 +46,6 @@ static bool show_timezone(void);
static bool reset_timezone(void);
static bool parse_timezone(char *);
static bool show_DefaultXactIsoLevel(void);
static bool reset_DefaultXactIsoLevel(void);
static bool parse_DefaultXactIsoLevel(char *);
static bool show_XactIsoLevel(void);
static bool reset_XactIsoLevel(void);
static bool parse_XactIsoLevel(char *);
......@@ -448,69 +445,6 @@ reset_timezone(void)
/* SET TRANSACTION */
static bool
parse_DefaultXactIsoLevel(char *value)
{
#if 0
TransactionState s = CurrentTransactionState;
#endif
if (value == NULL)
{
reset_DefaultXactIsoLevel();
return TRUE;
}
#if 0
if (s->state != TRANS_DEFAULT)
{
elog(ERROR, "ALTER SESSION/SET TRANSACTION ISOLATION LEVEL"
" can not be called within a transaction");
return TRUE;
}
#endif
if (strcasecmp(value, "SERIALIZABLE") == 0)
DefaultXactIsoLevel = XACT_SERIALIZABLE;
else if (strcasecmp(value, "COMMITTED") == 0)
DefaultXactIsoLevel = XACT_READ_COMMITTED;
else
elog(ERROR, "Bad TRANSACTION ISOLATION LEVEL (%s)", value);
return TRUE;
}
static bool
show_DefaultXactIsoLevel(void)
{
if (DefaultXactIsoLevel == XACT_SERIALIZABLE)
elog(NOTICE, "Default TRANSACTION ISOLATION LEVEL is SERIALIZABLE");
else
elog(NOTICE, "Default TRANSACTION ISOLATION LEVEL is READ COMMITTED");
return TRUE;
}
static bool
reset_DefaultXactIsoLevel(void)
{
#if 0
TransactionState s = CurrentTransactionState;
if (s->state != TRANS_DEFAULT)
{
elog(ERROR, "ALTER SESSION/SET TRANSACTION ISOLATION LEVEL"
" can not be called within a transaction");
return TRUE;
}
#endif
DefaultXactIsoLevel = XACT_READ_COMMITTED;
return TRUE;
}
static bool
parse_XactIsoLevel(char *value)
{
......@@ -530,7 +464,7 @@ parse_XactIsoLevel(char *value)
if (strcasecmp(value, "SERIALIZABLE") == 0)
XactIsoLevel = XACT_SERIALIZABLE;
else if (strcasecmp(value, "COMMITTED") == 0)
else if (strcasecmp(value, "READ COMMITTED") == 0)
XactIsoLevel = XACT_READ_COMMITTED;
else
elog(ERROR, "Bad TRANSACTION ISOLATION LEVEL (%s)", value);
......@@ -711,8 +645,6 @@ SetPGVariable(const char *name, const char *value)
parse_datestyle(mvalue);
else if (strcasecmp(name, "timezone") == 0)
parse_timezone(mvalue);
else if (strcasecmp(name, "DefaultXactIsoLevel") == 0)
parse_DefaultXactIsoLevel(mvalue);
else if (strcasecmp(name, "XactIsoLevel") == 0)
parse_XactIsoLevel(mvalue);
else if (strcasecmp(name, "client_encoding") == 0)
......@@ -737,8 +669,6 @@ GetPGVariable(const char *name)
show_datestyle();
else if (strcasecmp(name, "timezone") == 0)
show_timezone();
else if (strcasecmp(name, "DefaultXactIsoLevel") == 0)
show_DefaultXactIsoLevel();
else if (strcasecmp(name, "XactIsoLevel") == 0)
show_XactIsoLevel();
else if (strcasecmp(name, "client_encoding") == 0)
......@@ -752,7 +682,6 @@ GetPGVariable(const char *name)
ShowAllGUCConfig();
show_datestyle();
show_timezone();
show_DefaultXactIsoLevel();
show_XactIsoLevel();
show_client_encoding();
show_server_encoding();
......@@ -772,8 +701,6 @@ ResetPGVariable(const char *name)
reset_datestyle();
else if (strcasecmp(name, "timezone") == 0)
reset_timezone();
else if (strcasecmp(name, "DefaultXactIsoLevel") == 0)
reset_DefaultXactIsoLevel();
else if (strcasecmp(name, "XactIsoLevel") == 0)
reset_XactIsoLevel();
else if (strcasecmp(name, "client_encoding") == 0)
......@@ -784,8 +711,6 @@ ResetPGVariable(const char *name)
reset_random_seed();
else if (strcasecmp(name, "all") == 0)
{
reset_DefaultXactIsoLevel();
reset_XactIsoLevel();
reset_random_seed();
/* reset_server_encoding(); */
reset_client_encoding();
......@@ -793,7 +718,8 @@ ResetPGVariable(const char *name)
reset_timezone();
ResetAllOptions(false);
} else
}
else
SetConfigOption(name, NULL,
superuser() ? PGC_SUSET : PGC_USERSET,
false);
......
src/backend/parser/gram.y
View file @ 10e9cd22
......@@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.232 2001/06/23 00:07:34 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.233 2001/06/30 22:03:25 petere Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
......@@ -752,7 +752,7 @@ VariableSetStmt: SET ColId TO var_value
| SET SESSION CHARACTERISTICS AS TRANSACTION ISOLATION LEVEL opt_level
{
VariableSetStmt *n = makeNode(VariableSetStmt);
n->name = "DefaultXactIsoLevel";
n->name = "default_transaction_isolation";
n->value = $8;
$$ = (Node *) n;
}
......@@ -772,7 +772,7 @@ VariableSetStmt: SET ColId TO var_value
}
;
opt_level: READ COMMITTED { $$ = "committed"; }
opt_level: READ COMMITTED { $$ = "read committed"; }
| SERIALIZABLE { $$ = "serializable"; }
;
......
src/backend/utils/misc/guc.c
View file @ 10e9cd22
......@@ -4,7 +4,7 @@
* Support for grand unified configuration scheme, including SET
* command, configuration file, and command line options.
*
* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.43 2001/06/27 23:31:39 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.44 2001/06/30 22:03:26 petere Exp $
*
* Copyright 2000 by PostgreSQL Global Development Group
* Written by Peter Eisentraut <peter_e@gmx.net>.
......@@ -51,6 +51,11 @@ extern char *Syslog_ident;
static bool check_facility(const char *facility);
#endif
static char *default_iso_level_string;
static bool check_defaultxactisolevel(const char *value);
static void assign_defaultxactisolevel(const char *value);
/*
* Debugging options
*/
......@@ -355,6 +360,9 @@ static struct config_real
static struct config_string
ConfigureNamesString[] =
{
{"default_transaction_isolation", PGC_USERSET, &default_iso_level_string,
"read committed", check_defaultxactisolevel, assign_defaultxactisolevel},
{"dynamic_library_path", PGC_SUSET, &Dynamic_library_path,
"$libdir", NULL, NULL},
......@@ -1092,3 +1100,25 @@ check_facility(const char *facility)
}
#endif
static bool
check_defaultxactisolevel(const char *value)
{
return (strcasecmp(value, "read committed") == 0
|| strcasecmp(value, "serializable") == 0)
? true : false;
}
static void
assign_defaultxactisolevel(const char *value)
{
if (strcasecmp(value, "serializable") == 0)
DefaultXactIsoLevel = XACT_SERIALIZABLE;
else if (strcasecmp(value, "read committed") == 0)
DefaultXactIsoLevel = XACT_READ_COMMITTED;
else
elog(ERROR, "bogus transaction isolation level");
}
src/backend/utils/misc/postgresql.conf.sample
View file @ 10e9cd22
......@@ -166,6 +166,7 @@
#
# Misc
#
#default_transaction_isolation = 'read committed'
#sql_inheritance = true
#australian_timezones = false
#deadlock_timeout = 1000
......
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