求助，还能这么优化？这是一个视图的查询，每次要10秒左右。 我移到存储过程中，居然报ORA-01747:user.table.column,table.column或列说明无效 无语了，放在视图中没问题的， dblink是不是有什么限制，还是啥的。 Oracle insert into MR_MSG_XZBKMX_RES_BKXX(
求助，还能这么优化？这是一个视图的查询，每次要10秒左右。我移到存储过程中，居然报 ORA-01747: user.table.column, table.column 或列说明无效
无语了，放在视图中没问题的，
dblink是不是有什么限制，还是啥的。 Oracle
insert into MR_MSG_XZBKMX_RES_BKXX(ID,MSGID,HH,HM, DZ,BW,BCH,
BWH,KJ,BSH, SQXZ,SQCBR,HBSL,
ZDDS,RJSL,LSSL, QSL1,QSL2,QSL3,
DJ,HHYS,YSXZMS, RKS,CBZQ,SFLX,
LXDH,ZBRQ,QFSL, QFJE,QFBS,DKZHYE,
SQDBDS,YSKYE,TSXX, MS1,MS2,MS3,
MS4,MS5,CBSXH, BKSXH)
select SEQ_MR_MSG_XZBKMX_RES_BKXX.nextval, pinmsgid,x.HH,x.HM, x.DZ,x.BW,x.BCH,
x.BWH,x.KJ,x.BSH, x.SQXZ,x.SQCBR,x.HBSL,
decode(x.ZDDS,0,v_zdds,x.ZDDS),x.RJSL,case when v_lssllx=1 then x.qsl1 else x.pjsl end, x.QSL1,x.QSL2,x.QSL3,
x.DJ,x.HHYS,x.YSXZMS, x.RKS,x.CBZQ,x.SFLX,
x.LXDH,x.ZBRQ,x.QFSL, x.QFJE,x.QFBS,x.DKZHYE,
x.SQDBDS,x.YSKYE,x.TSXX, x.MS1,x.MS2,x.MS3,
x.MS4,x.MS5,x.CBSXH, rownum from
(select a.hh,
a.bzmc HM,
a.yhdz DZ,
a.zbwz BW,
a.bch,
a.bwh,
f.kj,
f.bsh,
NVL(g.xbqd,d.sqxz) SQXZ,
d.sqcbr,
0 hbsl,
f.zdds zdds,
-1 rjsl,
d.pjsl,
d.qsl1,d.qsl2,d.qsl3,
a.zysxz,
h.dj,
case when a.ysxzsl=1 then 0 else 1 end hhys,
h.xzms YSXZMS,
a.ysrk RKS,
a.cbzq,
i.sflx,
i.lxdh,
k.zbrq,
0 QFSL,
0 QFJE,
0 QFBS,
0 dkzhye,
0 sqdbds,
NVL(i.yskye,0) yskye,
null tsxx,
null ms1,
null ms2,
null ms3,
null ms4,
null ms5,
d.cbsxh
from da_yhbk@o3mislink a
full join da_cbxx@o3mislink d on a.hh = d.hh
full join sb_sbda@o3mislink f on f.sbid = a.sbid
full join da_khxx@o3mislink i on i.khh = a.khh
full join da_lhxx@o3mislink k on k.hh = a.hh
full join da_dm_yhzt@o3mislink c on a.yhzt = c.ztid and c.sfcb = 1
left join mr_gps n on a.hh=n.hh
left join (select x.hh,x.xbqd
from cb_chrw@o3mislink x,
(select a.hh,max(a.sgrq) sgrq from cb_chrw@o3mislink a,da_yhbk@o3mislink c
where (v_bchs like '%'||c.bch||',%') and a.hh=c.hh and a.jsbz=1
group by a.hh) y
where x.hh = y.hh and x.sgrq = y.sgrq) g on g.hh = a.hh
full join (select ysxz,dj,xzms from fy_ysxz@o3mislink
where v_sfyf between sxrq and nvl(jsrq,v_sfyf)
) h on a.zysxz = h.ysxz
left join cb_slb@o3mislink e on a.hh = e.hh and e.jgbz in (0,1,2,4,6,7) and e.sfyf = v_sfyf
where v_bchs like '%'||a.bch||',%'
and MOD(EXTRACT(month from trunc(v_sfyf,'MM')),a.CBZQ)=MOD(a.QCY,a.CBZQ)
and e.hh is null
order by a.bch,d.cbsxh
) x;
SELECT STATEMENT, GOAL = ALL_ROWS 216384 148833 69058512
SORT ORDER BY 216384 148833 69058512
FILTER
NESTED LOOPS OUTER 201685 148833 69058512
HASH JOIN RIGHT SEMI 168940 148833 68165514
TABLE ACCESS FULL NNMIS DA_DM_YHZT 2 5 30
VIEW SYS 168919 1041831 470907612
UNION-ALL
HASH JOIN RIGHT OUTER 123752 1041825 468821250
TABLE ACCESS BY INDEX ROWID NNMIS FY_YSXZ 3 6 186
INDEX RANGE SCAN NNMIS IDX_FY_YSXZ_SXRQ 2 21
HASH JOIN RIGHT OUTER 123731 1041825 436524675
VIEW NNMIS 1052 1 26
TABLE ACCESS BY INDEX ROWID NNMIS CB_CHRW 2 1 14
NESTED LOOPS 1052 1 36
VIEW NNMIS 1050 1 22
HASH GROUP BY 1050 1 33
HASH JOIN 1047 17643 582219
INDEX FAST FULL SCAN NNMIS IX_DA_YHBK_BCH 431 17341 329479
TABLE ACCESS FULL NNMIS CB_CHRW 614 33941 475174
INDEX RANGE SCAN NNMIS IDX_CB_CHRW_HH 1 1
HASH JOIN RIGHT OUTER 122661 1041825 409437225
REMOTE MR_GPS 0 1 9
VIEW SYS 122642 1041825 400060800
UNION-ALL
HASH JOIN RIGHT OUTER 49369 710090 274804830
TABLE ACCESS FULL NNMIS DA_LHXX 879 331736 3980832
VIEW SYS 35071 710090 266283750
UNION-ALL
HASH JOIN RIGHT OUTER 16953 374282 127255880
TABLE ACCESS FULL NNMIS DA_KHXX 1631 335809 5372944
VIEW SYS 8900 374282 121267368
UNION-ALL
NESTED LOOPS OUTER 4073 174 54462
VIEW SYS 3724 174 52026
UNION-ALL
NESTED LOOPS OUTER 2685 173 41174
TABLE ACCESS FULL NNMIS DA_YHBK 2346 173 36676
TABLE ACCESS BY INDEX ROWID NNMIS DA_CBXX 2 1 26
INDEX UNIQUE SCAN NNMIS PK_DA_CBXX 1 1
FILTER
NESTED LOOPS ANTI 1040 1 39
TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 8625136
INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764
TABLE ACCESS BY INDEX ROWID NNMIS SB_SBDA 2 1 14
INDEX UNIQUE SCAN NNMIS PK_CB_SBDA 1 1
FILTER
HASH JOIN RIGHT ANTI 4827 374108 10100916
VIEW NNMIS 3050 346829 4508777
UNION-ALL
MERGE JOIN OUTER 2771 346828 10751668
TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 9017528
INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828
SORT JOIN 1226 331736 1658680
INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680
NESTED LOOPS ANTI 279 1 18
INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680
INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764
TABLE ACCESS FULL NNMIS SB_SBDA 883 374109 5237526
FILTER
HASH JOIN ANTI 18117 335808 9738432
TABLE ACCESS FULL NNMIS DA_KHXX 1631 335809 5372944
VIEW NNMIS 15153 720937 9372181
UNION-ALL
HASH JOIN RIGHT OUTER 11205 346829 10404870
INDEX FAST FULL SCAN NNMIS PK_CB_SBDA 181 374109 1496436
VIEW NNMIS 10094 346829 9017554
UNION-ALL
MERGE JOIN OUTER 9055 346828 621168948
TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 591688568
INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828
SORT JOIN 7509 331736 28197560
TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560
NESTED LOOPS ANTI 1040 1 98
TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560
INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764
HASH JOIN ANTI 3948 374108 6359836
INDEX FAST FULL SCAN NNMIS PK_CB_SBDA 181 374109 1496436
VIEW NNMIS 3050 346829 4508777
UNION-ALL
MERGE JOIN OUTER 2771 346828 10751668
TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 9017528
INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828
SORT JOIN 1226 331736 1658680
INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680
NESTED LOOPS ANTI 279 1 18
INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680
INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764
FILTER
HASH JOIN ANTI 73273 331735 8293375
TABLE ACCESS FULL NNMIS DA_LHXX 879 331736 3980832
VIEW NNMIS 70721 1056745 13737685
UNION-ALL
HASH JOIN RIGHT OUTER 54237 720937 22349047
INDEX FAST FULL SCAN NNMIS SYS_C0057272 173 335809 1679045
VIEW NNMIS 52462 720937 18744362
UNION-ALL
HASH JOIN RIGHT OUTER 46713 346829 743948205
TABLE ACCESS FULL NNMIS SB_SBDA 883 374109 24691194
VIEW NNMIS 10094 346829 721057491
UNION-ALL
MERGE JOIN OUTER 9055 346828 621168948
TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 591688568
INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828
SORT JOIN 7509 331736 28197560
TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560
NESTED LOOPS ANTI 1040 1 98
TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560
INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764
HASH JOIN RIGHT ANTI 5749 374108 29554532
VIEW NNMIS 3050 346829 4508777
UNION-ALL
MERGE JOIN OUTER 2771 346828 10751668
TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 9017528
INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828
SORT JOIN 1226 331736 1658680
INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680
NESTED LOOPS ANTI 279 1 18
INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680
INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764
TABLE ACCESS FULL NNMIS SB_SBDA 883 374109 24691194
HASH JOIN ANTI 16484 335808 6044544
INDEX FAST FULL SCAN NNMIS SYS_C0057272 173 335809 1679045
VIEW NNMIS 15153 720937 9372181
UNION-ALL
HASH JOIN RIGHT OUTER 11205 346829 10404870
INDEX FAST FULL SCAN NNMIS PK_CB_SBDA 181 374109 1496436
VIEW NNMIS 10094 346829 9017554
UNION-ALL
MERGE JOIN OUTER 9055 346828 621168948
TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 591688568
INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828
SORT JOIN 7509 331736 28197560
TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560
NESTED LOOPS ANTI 1040 1 98
TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560
INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764
HASH JOIN ANTI 3948 374108 6359836
INDEX FAST FULL SCAN NNMIS PK_CB_SBDA 181 374109 1496436
VIEW NNMIS 3050 346829 4508777
UNION-ALL
MERGE JOIN OUTER 2771 346828 10751668
TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 9017528
INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828
SORT JOIN 1226 331736 1658680
INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680
NESTED LOOPS ANTI 279 1 18
INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680
INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764
FILTER
FILTER
TABLE ACCESS BY INDEX ROWID NNMIS FY_YSXZ 3 6 186
INDEX RANGE SCAN NNMIS IDX_FY_YSXZ_SXRQ 2 21
HASH JOIN RIGHT OUTER 16080 3472 187488
VIEW NNMIS 1052 1 13
TABLE ACCESS BY INDEX ROWID NNMIS CB_CHRW 2 1 14
NESTED LOOPS 1052 1 36
VIEW NNMIS 1050 1 22
SORT GROUP BY 1050 1 33
HASH JOIN 1047 17643 582219
INDEX FAST FULL SCAN NNMIS IX_DA_YHBK_BCH 431 17341 329479
TABLE ACCESS FULL NNMIS CB_CHRW 614 33941 475174
INDEX RANGE SCAN NNMIS IDX_CB_CHRW_HH 1 1
NESTED LOOPS OUTER 15029 3472 142352
VIEW NNMIS 15027 3472 111104
UNION-ALL
HASH JOIN OUTER 15027 3471 10805223
VIEW NNMIS 12159 3471 10520601
UNION-ALL
HASH JOIN OUTER 12159 3470 8904020
VIEW NNMIS 7509 3470 8376580
UNION-ALL
HASH JOIN OUTER 7509 3469 7441005
VIEW NNMIS 4886 3469 7212051
UNION-ALL
HASH JOIN OUTER 4886 3468 6211188
TABLE ACCESS FULL NNMIS DA_YHBK 2137 3468 5916408
TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560
FILTER
NESTED LOOPS ANTI 1040 1 98
TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560
INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764
TABLE ACCESS FULL NNMIS SB_SBDA 883 374109 24691194
FILTER
HASH JOIN RIGHT ANTI 5749 374108 29554532
VIEW NNMIS 3050 346829 4508777
UNION-ALL
MERGE JOIN OUTER 2771 346828 10751668
TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 9017528
INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828
SORT JOIN 1226 331736 1658680
INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680
NESTED LOOPS ANTI 279 1 18
INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680
INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764
TABLE ACCESS FULL NNMIS SB_SBDA 883 374109 24691194
TABLE ACCESS FULL NNMIS DA_KHXX 1631 335809 51042968
FILTER
HASH JOIN RIGHT ANTI 20276 335808 55408320
VIEW NNMIS 15153 720937 9372181
UNION-ALL
HASH JOIN RIGHT OUTER 11205 346829 10404870
INDEX FAST FULL SCAN NNMIS PK_CB_SBDA 181 374109 1496436
VIEW NNMIS 10094 346829 9017554
UNION-ALL
MERGE JOIN OUTER 9055 346828 621168948
TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 591688568
INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828
SORT JOIN 7509 331736 28197560
TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560
NESTED LOOPS ANTI 1040 1 98
TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560
INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764
HASH JOIN ANTI 3948 374108 6359836
INDEX FAST FULL SCAN NNMIS PK_CB_SBDA 181 374109 1496436
VIEW NNMIS 3050 346829 4508777
UNION-ALL
MERGE JOIN OUTER 2771 346828 10751668
TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 9017528
INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828
SORT JOIN 1226 331736 1658680
INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680
NESTED LOOPS ANTI 279 1 18
INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680
INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764
TABLE ACCESS FULL NNMIS DA_KHXX 1631 335809 51042968
TABLE ACCESS FULL NNMIS DA_LHXX 879 331736 27202352
FILTER
HASH JOIN RIGHT ANTI 74367 331735 31514825
VIEW NNMIS 70721 1056745 13737685
UNION-ALL
HASH JOIN RIGHT OUTER 54237 720937 22349047
INDEX FAST FULL SCAN NNMIS SYS_C0057272 173 335809 1679045
VIEW NNMIS 52462 720937 18744362
UNION-ALL
HASH JOIN RIGHT OUTER 46713 346829 743948205
TABLE ACCESS FULL NNMIS SB_SBDA 883 374109 24691194
VIEW NNMIS 10094 346829 721057491
UNION-ALL
MERGE JOIN OUTER 9055 346828 621168948
TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 591688568
INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828
SORT JOIN 7509 331736 28197560
TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560
NESTED LOOPS ANTI 1040 1 98
TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560
INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764
HASH JOIN RIGHT ANTI 5749 374108 29554532
VIEW NNMIS 3050 346829 4508777
UNION-ALL
MERGE JOIN OUTER 2771 346828 10751668
TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 9017528
INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828
SORT JOIN 1226 331736 1658680
INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680
NESTED LOOPS ANTI 279 1 18
INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680
INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764
TABLE ACCESS FULL NNMIS SB_SBDA 883 374109 24691194
HASH JOIN ANTI 16484 335808 6044544
INDEX FAST FULL SCAN NNMIS SYS_C0057272 173 335809 1679045
VIEW NNMIS 15153 720937 9372181
UNION-ALL
HASH JOIN RIGHT OUTER 11205 346829 10404870
INDEX FAST FULL SCAN NNMIS PK_CB_SBDA 181 374109 1496436
VIEW NNMIS 10094 346829 9017554
UNION-ALL
MERGE JOIN OUTER 9055 346828 621168948
TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 591688568
INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828
SORT JOIN 7509 331736 28197560
TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560
NESTED LOOPS ANTI 1040 1 98
TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560
INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764
HASH JOIN ANTI 3948 374108 6359836
INDEX FAST FULL SCAN NNMIS PK_CB_SBDA 181 374109 1496436
VIEW NNMIS 3050 346829 4508777
UNION-ALL
MERGE JOIN OUTER 2771 346828 10751668
TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 9017528
INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828
SORT JOIN 1226 331736 1658680
INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680
NESTED LOOPS ANTI 279 1 18
INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680
INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764
TABLE ACCESS FULL NNMIS DA_LHXX 879 331736 27202352
REMOTE MR_GPS 0 1 9
VIEW SYS 0 1 6
TABLE ACCESS BY INDEX ROWID NNMIS CB_SLB 4 1 17
INDEX RANGE SCAN NNMIS IX_CB_SLB_HH_SFYF 3 1
声明
本文内容由网友自发贡献，版权归原作者所有，本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容，请联系admin@php.cn
您什么时候应该使用复合索引与多个单列索引？Apr 11, 2025 am 12:06 AM在数据库优化中，应根据查询需求选择索引策略：1.当查询涉及多个列且条件顺序固定时，使用复合索引；2.当查询涉及多个列但条件顺序不固定时，使用多个单列索引。复合索引适用于优化多列查询，单列索引则适合单列查询。
如何识别和优化MySQL中的慢速查询？ （慢查询日志，performance_schema）Apr 10, 2025 am 09:36 AM要优化MySQL慢查询，需使用slowquerylog和performance_schema：1.启用slowquerylog并设置阈值，记录慢查询；2.利用performance_schema分析查询执行细节，找出性能瓶颈并优化。
MySQL和SQL：开发人员的基本技能Apr 10, 2025 am 09:30 AMMySQL和SQL是开发者必备技能。1.MySQL是开源的关系型数据库管理系统，SQL是用于管理和操作数据库的标准语言。2.MySQL通过高效的数据存储和检索功能支持多种存储引擎，SQL通过简单语句完成复杂数据操作。3.使用示例包括基本查询和高级查询，如按条件过滤和排序。4.常见错误包括语法错误和性能问题，可通过检查SQL语句和使用EXPLAIN命令优化。5.性能优化技巧包括使用索引、避免全表扫描、优化JOIN操作和提升代码可读性。
描述MySQL异步主奴隶复制过程。Apr 10, 2025 am 09:30 AMMySQL异步主从复制通过binlog实现数据同步，提升读性能和高可用性。1)主服务器记录变更到binlog；2)从服务器通过I/O线程读取binlog；3)从服务器的SQL线程应用binlog同步数据。
mysql：简单的概念，用于轻松学习Apr 10, 2025 am 09:29 AMMySQL是一个开源的关系型数据库管理系统。1）创建数据库和表：使用CREATEDATABASE和CREATETABLE命令。2）基本操作：INSERT、UPDATE、DELETE和SELECT。3）高级操作：JOIN、子查询和事务处理。4）调试技巧：检查语法、数据类型和权限。5）优化建议：使用索引、避免SELECT*和使用事务。
MySQL：数据库的用户友好介绍Apr 10, 2025 am 09:27 AMMySQL的安装和基本操作包括：1.下载并安装MySQL，设置根用户密码；2.使用SQL命令创建数据库和表，如CREATEDATABASE和CREATETABLE；3.执行CRUD操作，使用INSERT,SELECT,UPDATE,DELETE命令；4.创建索引和存储过程以优化性能和实现复杂逻辑。通过这些步骤，你可以从零开始构建和管理MySQL数据库。
InnoDB缓冲池如何工作，为什么对性能至关重要？Apr 09, 2025 am 12:12 AMInnoDBBufferPool通过将数据和索引页加载到内存中来提升MySQL数据库的性能。1)数据页加载到BufferPool中，减少磁盘I/O。2)脏页被标记并定期刷新到磁盘。3)LRU算法管理数据页淘汰。4)预读机制提前加载可能需要的数据页。
MySQL：初学者的数据管理易用性Apr 09, 2025 am 12:07 AMMySQL适合初学者使用，因为它安装简单、功能强大且易于管理数据。1.安装和配置简单，适用于多种操作系统。2.支持基本操作如创建数据库和表、插入、查询、更新和删除数据。3.提供高级功能如JOIN操作和子查询。4.可以通过索引、查询优化和分表分区来提升性能。5.支持备份、恢复和安全措施，确保数据的安全和一致性。
热AI工具
Undresser.AI Undress
人工智能驱动的应用程序，用于创建逼真的裸体照片
AI Clothes Remover
用于从照片中去除衣服的在线人工智能工具。
Undress AI Tool
免费脱衣服图片
Clothoff.io
AI脱衣机
AI Hentai Generator
免费生成ai无尽的。
热门文章
R.E.P.O.能量晶体解释及其做什么（黄色晶体）
3 周前By尊渡假赌尊渡假赌尊渡假赌
R.E.P.O.最佳图形设置
3 周前By尊渡假赌尊渡假赌尊渡假赌
刺客信条阴影：贝壳谜语解决方案
2 周前ByDDD
R.E.P.O.如果您听不到任何人，如何修复音频
3 周前By尊渡假赌尊渡假赌尊渡假赌
WWE 2K25：如何解锁Myrise中的所有内容
3 周前By尊渡假赌尊渡假赌尊渡假赌
热工具
DVWA
Damn Vulnerable Web App (DVWA) 是一个PHP/MySQL的Web应用程序，非常容易受到攻击。它的主要目标是成为安全专业人员在合法环境中测试自己的技能和工具的辅助工具，帮助Web开发人员更好地理解保护Web应用程序的过程，并帮助教师/学生在课堂环境中教授/学习Web应用程序安全。DVWA的目标是通过简单直接的界面练习一些最常见的Web漏洞，难度各不相同。请注意，该软件中
适用于 Eclipse 的 SAP NetWeaver 服务器适配器
将Eclipse与SAP NetWeaver应用服务器集成。
EditPlus 中文破解版
体积小，语法高亮，不支持代码提示功能
Dreamweaver Mac版
视觉化网页开发工具
禅工作室 13.0.1
功能强大的PHP集成开发环境
