![]() This uses the client/server bandwidth extensively through a COPY. With g (client-side data generation), data is generated in pgbench client and then sent to the server. Generate data and load it into the standard tables, replacing any data already present. g or G (Generate data, client-side or server-side) # ![]() t (create Tables) #Ĭreate the tables used by the standard pgbench scenario, namely pgbench_accounts, pgbench_branches, pgbench_history, and pgbench_tellers. See below for a full list.ĭrop any existing pgbench tables. The most important options are -c (number of clients), -t (number of transactions), -T (time limit), and -f (specify a custom script file). In nearly all cases, you'll need some options to make a useful test. Once you have done the necessary setup, you can run your benchmark with a command that doesn't include -i, that is The -F (fillfactor) option might also be used at this point. You can (and, for most purposes, probably should) increase the number of rows by using the -s (scale factor) option. Be very careful to use another database if you have tables having these names!Īt the default “ scale factor” of 1, the tables initially contain this many rows: Pgbench -i creates four tables pgbench_accounts, pgbench_branches, pgbench_history, and pgbench_tellers, destroying any existing tables of these names. (You may also need -h, -p, and/or -U options to specify how to connect to the database server.) Where dbname is the name of the already-created database to test in. (When you are testing a custom script, you don't need this step, but will instead need to do whatever setup your test needs.) Initialization looks like: pgbench should be invoked with the -i (initialize) option to create and populate these tables. The default TPC-B-like transaction test requires specific tables to be set up beforehand. The last line reports the number of transactions per second. (In -T mode, only the actual number of transactions is printed.) The next line reports the number of failed transactions due to serialization or deadlock errors (see Failures and Serialization/Deadlock Retries for more information). The eighth line reports the number of transactions completed and intended (the latter being just the product of number of clients and number of transactions per client) these will be equal unless the run failed before completion or some SQL command(s) failed. The sixth line reports the maximum number of tries for transactions with serialization or deadlock errors (see Failures and Serialization/Deadlock Retries for more information). The first seven lines report some of the most important parameter settings. Tps = 896.967014 (without initial connection time) Number of failed transactions: 0 (0.000%) Number of transactions actually processed: 10000/10000 However, it is easy to test other cases by writing your own transaction script files. By default, pgbench tests a scenario that is loosely based on TPC-B, involving five SELECT, UPDATE, and INSERT commands per transaction. It runs the same sequence of SQL commands over and over, possibly in multiple concurrent database sessions, and then calculates the average transaction rate (transactions per second). Pgbench is a simple program for running benchmark tests on PostgreSQL.
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