oracle中设置了最大链接数还是报错

须要更新的数据有1100条。我连接的时候一直报错

ORA-12518, TNS:listener could not hand off client connection

依据商品的文章设置了最大连接数为：1200。session为1200*1.1+5=1325。可是tomcat还是报错

ORA-12518, TNS:listener could not
hand off client connection

查看最大连接数：

SQL> show parameter processes;

NAME TYPE VALUE

------------------------------------ ----------- ------------------------------

aq_tm_processes integer 0

db_writer_processes integer 1

gcs_server_processes integer 0

job_queue_processes integer 10

log_archive_max_processes integer 2

processes integer 1200

查看当前的的数据库v$processes 仅仅有356，v$session 352

PMON每5分钟更新listener中的内容，所以listener和数据库不一定是同步的，你如今从数据库上得知有356个连接。并不代表listener里面记录的是356个， 5分钟之内非常可能还没有被pmon更新，依旧保持着1200所以你报错ORA-12518 而不是ora-00020

SQL> show parameter pga;

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
pga_aggregate_target                 big integer 194M

SQL> select * from v$resource_limit;

RESOURCE_NAME                  CURRENT_UTILIZATION MAX_UTILIZATION INITIAL_ALLOCATION   LIMIT_VALUE
------------------------------ ------------------- --------------- -------------------- --------------------
processes                                       24             366       1200                 1200
sessions                                        27             362       1325                 1325
enqueue_locks                                   15              25      15950                15950
enqueue_resources                               15              43       6048            UNLIMITED
ges_procs                                        0               0          0                    0
ges_ress                                         0               0          0            UNLIMITED
ges_locks                                        0               0          0            UNLIMITED
ges_cache_ress                                   0               0          0            UNLIMITED
ges_reg_msgs                                     0               0          0            UNLIMITED
ges_big_msgs                                     0               0          0            UNLIMITED
ges_rsv_msgs                                     0               0          0                    0
gcs_resources                                    0               0          0                    0
gcs_shadows                                      0               0          0                    0
dml_locks                                        0              51       5828            UNLIMITED
temporary_table_locks                            0               3  UNLIMITED            UNLIMITED
transactions                                     1               7       1457            UNLIMITED
branches                                         0               0       1457            UNLIMITED
cmtcallbk                                        0               2       1457            UNLIMITED
sort_segment_locks                               0               3  UNLIMITED            UNLIMITED
max_rollback_segments                           11              11       1457                65535

RESOURCE_NAME                  CURRENT_UTILIZATION MAX_UTILIZATION INITIAL_ALLOCATION   LIMIT_VALUE
------------------------------ ------------------- --------------- -------------------- --------------------
max_shared_servers                               1               1  UNLIMITED            UNLIMITED
parallel_max_servers                             0               0         40                 3600

22 rows selected