postgres

History

Tom Lane bedb78d386 Implement sharable row-level locks, and use them for foreign key references

to eliminate unnecessary deadlocks.  This commit adds SELECT ... FOR SHARE
paralleling SELECT ... FOR UPDATE.  The implementation uses a new SLRU
data structure (managed much like pg_subtrans) to represent multiple-
transaction-ID sets.  When more than one transaction is holding a shared
lock on a particular row, we create a MultiXactId representing that set
of transactions and store its ID in the row's XMAX.  This scheme allows
an effectively unlimited number of row locks, just as we did before,
while not costing any extra overhead except when a shared lock actually
has to be shared.   Still TODO: use the regular lock manager to control
the grant order when multiple backends are waiting for a row lock.

Alvaro Herrera and Tom Lane.

2005-04-28 21:47:18 +00:00

.cvsignore

Add .cvsignore file so cvs doesn't complain if you have lex/yacc

1999-03-21 02:43:58 +00:00

analyze.c

Implement sharable row-level locks, and use them for foreign key references

2005-04-28 21:47:18 +00:00

gram.y

Implement sharable row-level locks, and use them for foreign key references

2005-04-28 21:47:18 +00:00

keywords.c

Tag appropriate files for rc3

2004-12-31 22:04:05 +00:00

Makefile

$Header: -> $PostgreSQL Changes ...

2003-11-29 19:52:15 +00:00

parse_agg.c

Convert oidvector and int2vector into variable-length arrays. This

2005-03-29 00:17:27 +00:00

parse_clause.c

Change addRangeTableEntryForRelation() to take a Relation pointer instead

2005-04-13 16:50:55 +00:00

parse_coerce.c

Convert oidvector and int2vector into variable-length arrays. This

2005-03-29 00:17:27 +00:00

parse_expr.c

Merge Resdom nodes into TargetEntry nodes to simplify code and save a

2005-04-06 16:34:07 +00:00

parse_func.c

Remove useless argtype_inherit() code, and make consequent simplifications.

2005-04-23 22:09:58 +00:00

parse_node.c

Allow -2147483648 to be treated as an INT4 rather than INT8 constant.

2005-04-23 18:35:12 +00:00

parse_oper.c

Tag appropriate files for rc3

2004-12-31 22:04:05 +00:00

parse_relation.c

Implement sharable row-level locks, and use them for foreign key references

2005-04-28 21:47:18 +00:00

parse_target.c

On further experimentation, there were still a couple of bugs in

2005-04-25 22:02:30 +00:00

parse_type.c

Implement sharable row-level locks, and use them for foreign key references

2005-04-28 21:47:18 +00:00

parser.c

Tag appropriate files for rc3

2004-12-31 22:04:05 +00:00

README

cleanup

1998-08-23 14:43:46 +00:00

scan.l

Add fprintf() custom version to libpgport.

2005-03-11 19:13:43 +00:00

scansup.c

Tag appropriate files for rc3

2004-12-31 22:04:05 +00:00

README

This directory does more than tokenize and parse SQL queries.  It also
creates Query structures for the various complex queries that is passed
to the optimizer and then executor.

parser.c	things start here
scan.l		break query into tokens
scansup.c	handle escapes in input
keywords.c	turn keywords into specific tokens
gram.y		parse the tokens and fill query-type-specific structures
analyze.c	handle post-parse processing for each query type
parse_clause.c	handle clauses like WHERE, ORDER BY, GROUP BY, ...
parse_coerce.c	used for coercing expressions of different types
parse_expr.c	handle expressions like col, col + 3, x = 3 or x = 4
parse_oper.c	handle operations in expressions
parse_agg.c	handle aggregates, like SUM(col1),  AVG(col2), ...
parse_func.c	handle functions, table.column and column identifiers
parse_node.c	create nodes for various structures
parse_target.c	handle the result list of the query
parse_relation.c support routines for tables and column handling
parse_type.c	support routines for type handling