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Commitb231608

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Add :client_id automatic variable for custom pgbench scripts.
This makes it easier to write custom scripts that have different logic foreach client.Gurjeet Singh, with some changes by me.
1 parent46e1434 commitb231608

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2 files changed

+41
-1
lines changed

2 files changed

+41
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lines changed

‎contrib/pgbench/pgbench.c

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@@ -2544,6 +2544,20 @@ main(int argc, char **argv)
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}
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}
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/*
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* Define a :client_id variable that is unique per connection. But don't
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* override an explicit -D switch.
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*/
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if (getVariable(&state[0],"client_id")==NULL)
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{
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for (i=0;i<nclients;i++)
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{
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snprintf(val,sizeof(val),"%d",i);
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if (!putVariable(&state[i],"startup","client_id",val))
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exit(1);
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}
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}
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if (!is_no_vacuum)
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{
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fprintf(stderr,"starting vacuum...");

‎doc/src/sgml/pgbench.sgml

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@@ -600,13 +600,39 @@ pgbench <optional> <replaceable>options</> </optional> <replaceable>dbname</>
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Variables can be set by the command-line <option>-D</> option,
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explained above, or by the meta commands explained below.
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In addition to any variables preset by <option>-D</> command-line options,
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the variable <literal>scale</> is preset to the current scale factor.
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there are a few variables that are preset automatically, listed in
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<xref linkend="pgbench-automatic-variables">. A value specified for these
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variables using <option>-D</> takes precedence over the automatic presets.
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Once set, a variable's
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value can be inserted into a SQL command by writing
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<literal>:</><replaceable>variablename</>. When running more than
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one client session, each session has its own set of variables.
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</para>
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<table id="pgbench-automatic-variables">
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<title>Automatic variables</title>
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<tgroup cols="2">
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<thead>
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<row>
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<entry>Variable</entry>
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<entry>Description</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry> <literal>scale</literal> </entry>
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<entry>current scale factor</entry>
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</row>
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<row>
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<entry> <literal>client_id</literal> </entry>
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<entry>unique number identifying the client session (starts from zero)</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<para>
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Script file meta commands begin with a backslash (<literal>\</>).
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Arguments to a meta command are separated by white space.

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