PostgreSQL数据库压力测试工具pgbench简单应用

PostgreSQL数据库提供了一款轻量级的压力测试工具叫pgbench,其实就是一个编译好后的扩展性的可执行文件。介绍如下。
环境：
CentOS 5.7(final)
PG:9.1.2
Vmware 8.0
数据库参数： max_connection=100 ,其他略，默认

1.安装
进入源码安装包,编译,安装

[postgres@localhost  ~]$ cd postgresql-9.1.2/contrib/pgbench/
[postgres@localhost  pgbench]$ ll
total 164
-rw-r--r--. 1 postgres postgres   538 Dec  1  2011 Makefile
-rwxrwxr-x. 1 postgres postgres 50203 Apr 26 23:50 pgbench
-rw-r--r--. 1 postgres postgres 61154 Dec  1  2011 pgbench.c
-rw-rw-r--. 1 postgres postgres 47920 Apr 26 23:50 pgbench.o
[postgres@localhost  pgbench]$make all
[postgres@localhost  pgbench]$make install

安装完毕以后可以在bin文件夹下看到新生成的pgbench文件

[postgres@localhost  bin]$ ll $PGHOME/bin pgbench
-rwxr-xr-x. 1 postgres postgres 50203 Jul  8 20:28 pgbench

2.参数介绍

[postgres@localhost  bin]$ pgbench --help
pgbench is a benchmarking tool for PostgreSQL.

Usage:
  pgbench [OPTIONS]... [DBNAME]

Initialization options:
  -i           invokes initialization mode
  -F NUM       fill factor
  -s NUM       scaling factor

Benchmarking options:
  -c NUM       number of concurrent database clients (default: 1)
  -C           establish new connection for each transaction
  -D VARNAME=VALUE
               define variable for use by custom script
  -f FILENAME  read transaction script from FILENAME
  -j NUM       number of threads (default: 1)
  -l           write transaction times to log file
  -M {simple|extended|prepared}
               protocol for submitting queries to server (default: simple)
  -n           do not run VACUUM before tests
  -N           do not update tables "pgbench_tellers" and "pgbench_branches"
  -r           report average latency per command
  -s NUM       report this scale factor in output
  -S           perform SELECT-only transactions
  -t NUM       number of transactions each client runs (default: 10)
  -T NUM       duration of benchmark test in seconds
  -v           vacuum all four standard tables before tests

Common options:
  -d           print debugging output
  -h HOSTNAME  database server host or socket directory
  -p PORT      database server port number
  -U USERNAME  connect as specified database user
  --help       show this help, then exit
  --version    output version information, then exit

Report bugs to .

3.初始化测试数据

[postgres@localhost  ~]$ pgbench -i pgbench
creating tables...
10000 tuples done.
20000 tuples done.
30000 tuples done.
40000 tuples done.
50000 tuples done.
60000 tuples done.
70000 tuples done.
80000 tuples done.
90000 tuples done.
100000 tuples done.
set primary key...
NOTICE:  ALTER TABLE / ADD PRIMARY KEY will create implicit index "pgbench_branches_pkey" for table "pgbench_branches"
NOTICE:  ALTER TABLE / ADD PRIMARY KEY will create implicit index "pgbench_tellers_pkey" for table "pgbench_tellers"
NOTICE:  ALTER TABLE / ADD PRIMARY KEY will create implicit index "pgbench_accounts_pkey" for table "pgbench_accounts"
vacuum...done.
[postgres@localhost  ~]$ psql -d pgbench
psql (9.1.2)
Type "help" for help.

pgbench=# select count(1) from pgbench_accounts;
 count  
--------
 100000
(1 row)

pgbench=# select count(1) from pgbench_branches;
 count 
-------
     1
(1 row)

pgbench=# select count(1) from pgbench_history;
 count 
-------
     0
(1 row)

pgbench=# select count(1) from pgbench_tellers;
 count 
-------
    10
(1 row)

pgbench=# \d+ pgbench_accounts
                Table "public.pgbench_accounts"
  Column  |     Type      | Modifiers | Storage  | Description 
----------+---------------+-----------+----------+-------------
 aid      | integer       | not null  | plain    | 
 bid      | integer       |           | plain    | 
 abalance | integer       |           | plain    | 
 filler   | character(84) |           | extended | 
Indexes:
    "pgbench_accounts_pkey" PRIMARY KEY, btree (aid)
Has OIDs: no
Options: fillfactor=100

pgbench=# \d+ pgbench_branches
                Table "public.pgbench_branches"
  Column  |     Type      | Modifiers | Storage  | Description 
----------+---------------+-----------+----------+-------------
 bid      | integer       | not null  | plain    | 
 bbalance | integer       |           | plain    | 
 filler   | character(88) |           | extended | 
Indexes:
    "pgbench_branches_pkey" PRIMARY KEY, btree (bid)
Has OIDs: no
Options: fillfactor=100

pgbench=# \d+ pgbench_history 
                      Table "public.pgbench_history"
 Column |            Type             | Modifiers | Storage  | Description 
--------+-----------------------------+-----------+----------+-------------
 tid    | integer                     |           | plain    | 
 bid    | integer                     |           | plain    | 
 aid    | integer                     |           | plain    | 
 delta  | integer                     |           | plain    | 
 mtime  | timestamp without time zone |           | plain    | 
 filler | character(22)               |           | extended | 
Has OIDs: no

pgbench=# \d+ pgbench_tellers 
                Table "public.pgbench_tellers"
  Column  |     Type      | Modifiers | Storage  | Description 
----------+---------------+-----------+----------+-------------
 tid      | integer       | not null  | plain    | 
 bid      | integer       |           | plain    | 
 tbalance | integer       |           | plain    | 
 filler   | character(84) |           | extended | 
Indexes:
    "pgbench_tellers_pkey" PRIMARY KEY, btree (tid)
Has OIDs: no
Options: fillfactor=100

说明：
a.这里使用的是默认的参数值,带-s 参数时可指定测试数据的数据量,-f可以指定测试的脚本,这里用的是默认脚本
b.不要在生产的库上做，新建一个测试库，当生产上有同名的测试表时将被重置