<para>
If the client has not issued an explicit <command>BEGIN</command>,
- then an implicit transaction block is started and each Sync ordinarily
- causes an implicit <command>COMMIT</command> if the preceding step(s)
- succeeded, or an implicit <command>ROLLBACK</command> if they failed.
- This implicit transaction block will only be detected by the server
- when the first command ends without a sync. There are a few DDL
- commands (such as <command>CREATE DATABASE</command>) that cannot be
- executed inside a transaction block. If one of these is executed in a
- pipeline, it will fail unless it is the first command after a Sync.
- Furthermore, upon success it will force an immediate commit to preserve
- database consistency. Thus a Sync immediately following one of these
- commands has no effect except to respond with ReadyForQuery.
+ then each Sync ordinarily causes an implicit <command>COMMIT</command>
+ if the preceding step(s) succeeded, or an
+ implicit <command>ROLLBACK</command> if they failed. However, there
+ are a few DDL commands (such as <command>CREATE DATABASE</command>)
+ that cannot be executed inside a transaction block. If one of
+ these is executed in a pipeline, it will fail unless it is the first
+ command in the pipeline. Furthermore, upon success it will force an
+ immediate commit to preserve database consistency. Thus a Sync
+ immediately following one of these commands has no effect except to
+ respond with ReadyForQuery.
</para>
<para>
xact_started = true;
}
- else if (MyXactFlags & XACT_FLAGS_PIPELINING)
- {
- /*
- * When the first Execute message is completed, following commands
- * will be done in an implicit transaction block created via
- * pipelining. The transaction state needs to be updated to an
- * implicit block if we're not already in a transaction block (like
- * one started by an explicit BEGIN).
- */
- BeginImplicitTransactionBlock();
- }
/*
* Start statement timeout if necessary. Note that this'll intentionally
case PqMsg_Sync:
pq_getmsgend(&input_message);
-
- /*
- * If pipelining was used, we may be in an implicit
- * transaction block. Close it before calling
- * finish_xact_command.
- */
- EndImplicitTransactionBlock();
finish_xact_command();
valgrind_report_error_query("SYNC message");
send_ready_for_query = true;
}
});
-# Try SET LOCAL as first pipeline command. This succeeds and the first
-# command is not executed inside an implicit transaction block, causing
-# a WARNING.
-$node->pgbench(
- '-t 1 -n -M extended',
- 0,
- [],
- [qr{WARNING: SET LOCAL can only be used in transaction blocks}],
- 'SET LOCAL outside implicit transaction block of pipeline',
- {
- '001_pgbench_pipeline_set_local_1' => q{
-\startpipeline
-SET LOCAL statement_timeout='1h';
-\endpipeline
-}
- });
-
-# Try SET LOCAL as second pipeline command. This succeeds and the second
-# command does not cause a WARNING to be generated.
-$node->pgbench(
- '-t 1 -n -M extended',
- 0,
- [],
- [qr{^$}],
- 'SET LOCAL inside implicit transaction block of pipeline',
- {
- '001_pgbench_pipeline_set_local_2' => q{
-\startpipeline
-SELECT 1;
-SET LOCAL statement_timeout='1h';
-\endpipeline
-}
- });
-
-# Try SET LOCAL with \syncpipeline. This succeeds and the command
-# launched after the sync is outside the implicit transaction block
-# of the pipeline, causing a WARNING.
-$node->pgbench(
- '-t 1 -n -M extended',
- 0,
- [],
- [qr{WARNING: SET LOCAL can only be used in transaction blocks}],
- 'SET LOCAL and \syncpipeline',
- {
- '001_pgbench_pipeline_set_local_3' => q{
-\startpipeline
-SELECT 1;
-\syncpipeline
-SET LOCAL statement_timeout='1h';
-\endpipeline
-}
- });
-
-# Try REINDEX CONCURRENTLY as first pipeline command. This succeeds
-# as the first command is outside the implicit transaction block of
-# a pipeline.
-$node->pgbench(
- '-t 1 -n -M extended',
- 0,
- [],
- [],
- 'REINDEX CONCURRENTLY outside implicit transaction block of pipeline',
- {
- '001_pgbench_pipeline_reindex_1' => q{
-\startpipeline
-REINDEX TABLE CONCURRENTLY pgbench_accounts;
-SELECT 1;
-\endpipeline
-}
- });
-
-# Try REINDEX CONCURRENTLY as second pipeline command. This fails
-# as the second command is inside an implicit transaction block.
-$node->pgbench(
- '-t 1 -n -M extended',
- 2,
- [],
- [],
- 'error: REINDEX CONCURRENTLY inside implicit transaction block of pipeline',
- {
- '001_pgbench_pipeline_reindex_2' => q{
-\startpipeline
-SELECT 1;
-REINDEX TABLE CONCURRENTLY pgbench_accounts;
-\endpipeline
-}
- });
-
-# Try VACUUM as first pipeline command. Like REINDEX CONCURRENTLY, this
-# succeeds as this is outside the implicit transaction block of a pipeline.
-$node->pgbench(
- '-t 1 -n -M extended',
- 0,
- [],
- [],
- 'VACUUM outside implicit transaction block of pipeline',
- {
- '001_pgbench_pipeline_vacuum_1' => q{
-\startpipeline
-VACUUM pgbench_accounts;
-\endpipeline
-}
- });
-
-# Try VACUUM as second pipeline command. This fails, as the second command
-# of a pipeline is inside an implicit transaction block.
-$node->pgbench(
- '-t 1 -n -M extended',
- 2,
- [],
- [],
- 'error: VACUUM inside implicit transaction block of pipeline',
- {
- '001_pgbench_pipeline_vacuum_2' => q{
-\startpipeline
-SELECT 1;
-VACUUM pgbench_accounts;
-\endpipeline
-}
- });
-
-# Try subtransactions in a pipeline. These are forbidden in implicit
-# transaction blocks.
-$node->pgbench(
- '-t 1 -n -M extended',
- 2,
- [],
- [],
- 'error: subtransactions not allowed in pipeline',
- {
- '001_pgbench_pipeline_subtrans' => q{
-\startpipeline
-SAVEPOINT a;
-SELECT 1;
-ROLLBACK TO SAVEPOINT a;
-SELECT 2;
-\endpipeline
-}
- });
-
-# Try LOCK TABLE as first pipeline command. This fails as LOCK is outside
-# an implicit transaction block.
-$node->pgbench(
- '-t 1 -n -M extended',
- 2,
- [],
- [],
- 'error: LOCK TABLE outside implicit transaction block of pipeline',
- {
- '001_pgbench_pipeline_lock_1' => q{
-\startpipeline
-LOCK pgbench_accounts;
-SELECT 1;
-\endpipeline
-}
- });
-
-# Try LOCK TABLE as second pipeline command. This succeeds as LOCK is inside
-# an implicit transaction block.
-$node->pgbench(
- '-t 1 -n -M extended',
- 0,
- [],
- [],
- 'LOCK TABLE inside implicit transaction block of pipeline',
- {
- '001_pgbench_pipeline_lock_2' => q{
-\startpipeline
-SELECT 1;
-LOCK pgbench_accounts;
-\endpipeline
-}
- });
-
# Working \startpipeline in prepared query mode with serializable
$node->pgbench(
'-c4 -t 10 -n -M prepared',
projects / thirdparty / postgresql.git / commitdiff
