Question

我从php的Postgres服务器连接有点麻烦。我刚开始使用Postgres + PHP组合，我意识到连接建立真的很慢进行简单连接通常需要1秒或有时超过2秒。它只是一个开发服务器，所以没有真正的流量。好吧，服务器不是最好的，但MySQL连接速度要快得多。

连接后，一切顺利，每个查询都按照我的预期运行。应用程序运行时间约为10％，连接约为90％。真奇怪，因为使用mysql数据库层它真的很快。

可能是什么问题？

我尝试过PDO，pg_pconnect，pg_connect，但每次结果都是一样的。

可能是Postgres配置错误？但是查询运行得很快，只有连接建立很慢。我不知道。

PG：PostgreSQL 8.3.9
PHP：5.2.6

提前谢谢！

配置：

#------------------------------------------------------------------------------
# CONNECTIONS AND AUTHENTICATION
#------------------------------------------------------------------------------

# - Connection Settings -

#listen_addresses = 'localhost'     # what IP address(es) to listen on;
                    # comma-separated list of addresses;
                    # defaults to 'localhost', '*' = all
                    # (change requires restart)
port = 5432             # (change requires restart)
max_connections = 100           # (change requires restart)
# Note:  Increasing max_connections costs ~400 bytes of shared memory per 
# connection slot, plus lock space (see max_locks_per_transaction).  You might
# also need to raise shared_buffers to support more connections.
#superuser_reserved_connections = 3 # (change requires restart)
unix_socket_directory = '/var/run/postgresql'       # (change requires restart)
#unix_socket_group = ''         # (change requires restart)
#unix_socket_permissions = 0777     # begin with 0 to use octal notation
                    # (change requires restart)
#bonjour_name = ''          # defaults to the computer name
                    # (change requires restart)

# - Security and Authentication -

#authentication_timeout = 1min      # 1s-600s
ssl = true              # (change requires restart)
#ssl_ciphers = 'ALL:!ADH:!LOW:!EXP:!MD5:@STRENGTH'  # allowed SSL ciphers
                    # (change requires restart)
#password_encryption = on
#db_user_namespace = off

# Kerberos and GSSAPI
#krb_server_keyfile = ''        # (change requires restart)
#krb_srvname = 'postgres'       # (change requires restart, Kerberos only)
#krb_server_hostname = ''       # empty string matches any keytab entry
                    # (change requires restart, Kerberos only)
#krb_caseins_users = off        # (change requires restart)
#krb_realm = ''                 # (change requires restart)

# - TCP Keepalives -
# see "man 7 tcp" for details

#tcp_keepalives_idle = 0        # TCP_KEEPIDLE, in seconds;
                    # 0 selects the system default
#tcp_keepalives_interval = 0        # TCP_KEEPINTVL, in seconds;
                    # 0 selects the system default
#tcp_keepalives_count = 0       # TCP_KEEPCNT;
                    # 0 selects the system default


#------------------------------------------------------------------------------
# RESOURCE USAGE (except WAL)
#------------------------------------------------------------------------------

# - Memory -

shared_buffers = 24MB           # min 128kB or max_connections*16kB
                    # (change requires restart)
#temp_buffers = 8MB         # min 800kB
#max_prepared_transactions = 5      # can be 0 or more
                    # (change requires restart)
# Note:  Increasing max_prepared_transactions costs ~600 bytes of shared memory
# per transaction slot, plus lock space (see max_locks_per_transaction).
#work_mem = 1MB             # min 64kB
#maintenance_work_mem = 16MB        # min 1MB
#max_stack_depth = 2MB          # min 100kB

# - Free Space Map -

max_fsm_pages = 153600          # min max_fsm_relations*16, 6 bytes each
                    # (change requires restart)
#max_fsm_relations = 1000       # min 100, ~70 bytes each
                    # (change requires restart)

# - Kernel Resource Usage -

#max_files_per_process = 1000       # min 25
                    # (change requires restart)
#shared_preload_libraries = ''      # (change requires restart)

# - Cost-Based Vacuum Delay -

#vacuum_cost_delay = 0          # 0-1000 milliseconds
#vacuum_cost_page_hit = 1       # 0-10000 credits
#vacuum_cost_page_miss = 10     # 0-10000 credits
#vacuum_cost_page_dirty = 20        # 0-10000 credits
#vacuum_cost_limit = 200        # 1-10000 credits

# - Background Writer -

#bgwriter_delay = 200ms         # 10-10000ms between rounds
#bgwriter_lru_maxpages = 100        # 0-1000 max buffers written/round
#bgwriter_lru_multiplier = 2.0      # 0-10.0 multipler on buffers scanned/round

Answer 1

如果您不使用SSL，请务必关闭SSL。如果您想使用SSL，请确保pg_hba.conf具有正确的设置以要求安全连接。

Answer 2

如果PostGres位于同一台服务器上，请尝试将连接配置为使用Unix套接字而不是TCP堆栈。很可能你的延迟是由Postgres服务器中的反向DNS解析或身份验证延迟引起的，所以如果Unix套接字不是一个选项，我会在postgres上启用调试日志并查看那里发生的事情。

PHP的Postgres连接很慢

2 个答案: