是什么原因down机?

paladinxxc

以下是数据库down机的online.log中的内容:
16:33:37  Maximum server connections 73
16:37:17  I/O read chunk 27, pagenum 139729, pagecnt 1 --> errno = 5
16:37:17  I/O read chunk 106, pagenum 178697, pagecnt 1 --> errno = 5
16:37:17  I/O read chunk 8, pagenum 953, pagecnt 1 --> errno = 5
16:37:17  I/O read chunk 13, pagenum 129, pagecnt 1 --> errno = 6
16:37:17  I/O read chunk 5, pagenum 997, pagecnt 1 --> errno = 5
16:37:17  I/O read chunk 5, pagenum 957, pagecnt 8 --> errno = 6
16:37:17  I/O read chunk 10, pagenum 933, pagecnt 8 --> errno = 6
16:37:17  I/O read chunk 15, pagenum 294268, pagecnt 1 --> errno = 5
16:37:17  I/O read chunk 13, pagenum 593191, pagecnt 1 --> errno = 6
16:37:17  I/O read chunk 93, pagenum 907528, pagecnt 1 --> errno = 6
16:37:17  I/O read chunk 9, pagenum 965, pagecnt 1 --> errno = 5
16:37:17  I/O read chunk 11, pagenum 933, pagecnt 1 --> errno = 5
16:37:17  I/O write chunk 3, pagenum 812713, pagecnt 1 --> errno = 5
16:37:17  I/O read chunk 6, pagenum 633, pagecnt 8 --> errno = 6
16:37:17  I/O read chunk 9, pagenum 965, pagecnt 1 --> errno = 6
16:37:17  I/O read chunk 11, pagenum 985, pagecnt 1 --> errno = 6
16:37:17  I/O read chunk 11, pagenum 985, pagecnt 1 --> errno = 6
16:37:17  I/O read chunk 15, pagenum 237593, pagecnt 1 --> errno = 6
16:37:17  I/O read chunk 95, pagenum 126, pagecnt 1 --> errno = 6
16:37:17  I/O read chunk 15, pagenum 52, pagecnt 1 --> errno = 6
16:37:17  I/O read chunk 15, pagenum 294268, pagecnt 1 --> errno = 6
16:37:17  Assert Failed: Dynamic Server must abort
16:37:17  IBM Informix Dynamic Server Version 9.40.FC3W1
16:37:17   Who: Session(95442, informix@, 29493, 1a43ee9b0)
                Thread(202035, sqlexec, 1a7ad38a0, 1)
                File: rslog.c Line: 3507
16:37:17   Results: Dynamic Server must abort
16:37:17   Action: Reinitialize shared memory
16:37:17  stack trace for pid 1690 written to /tmp/af.191bc5bc
16:37:17   See Also: /tmp/af.191bc5bc, shmem.191bc5bc.0
16:37:18  I/O read chunk 13, pagenum 421366, pagecnt 1 --> errno = 6
16:37:18  I/O read chunk 13, pagenum 398918, pagecnt 1 --> errno = 6
16:37:18  I/O read chunk 93, pagenum 945958, pagecnt 1 --> errno = 6
16:37:18  I/O read chunk 13, pagenum 637901, pagecnt 1 --> errno = 6
16:37:18  I/O read chunk 93, pagenum 870673, pagecnt 1 --> errno = 6
16:44:13  rslog.c, line 3507, thread 202035, proc id 1690, Dynamic Server must abort.
16:44:17  The Master Daemon Died
16:44:17  The Master Daemon Died
16:44:17  The Master Daemon Died
16:44:20  PANIC: Attempting to bring system down

paladinxxc

今天重启就好了,但是数据库特别慢?需要做什么操作优化吗?