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lock/unlock the specified table during oracle dump #992

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Merged
1 commit merged into from
Jun 22, 2022
Merged

lock/unlock the specified table during oracle dump #992

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2 changes: 1 addition & 1 deletion .gitignore
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Original file line number Diff line number Diff line change
Expand Up @@ -4,4 +4,4 @@ bin/
dist
.vagrant
.scannerwork
.vscode/launch.json
.vscode/
53 changes: 49 additions & 4 deletions driver/oracle/config/db_config.go
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@ type OracleDB struct {
_db *sql.DB
LogMinerConn *sql.Conn
MetaDataConn *sql.Conn
SCN int64
}

func (m *OracleConfig) ConnectString() string {
Expand Down Expand Up @@ -110,13 +111,18 @@ func (o *OracleDB) NLS_DATE_FORMAT() error {
return nil
}
func (o *OracleDB) GetTables(schema string) ([]string, error) {
asOfSCN := ""
// if o.SCN != 0 {
// asOfSCN = fmt.Sprintf("AS OF SCN %d", o.SCN)
// }
query := fmt.Sprintf(`
SELECT
table_name
FROM
all_tables
%s
WHERE
owner = '%s'`, schema)
owner = '%s'`, asOfSCN, schema)

rows, err := o.MetaDataConn.QueryContext(context.TODO(), query)
if err != nil {
Expand All @@ -137,12 +143,17 @@ WHERE
}

func (o *OracleDB) GetSchemas() ([]string, error) {
query := `SELECT
asOfSCN := ""
// if o.SCN != 0 {
// asOfSCN = fmt.Sprintf("AS OF SCN %d", o.SCN)
// }
query := fmt.Sprintf(`SELECT
USERNAME
FROM
DBA_USERS
%s
WHERE
USERNAME NOT IN ( 'SYS', 'SYSTEM', 'ANONYMOUS', 'APEX_PUBLIC_USER', 'APEX_040000', 'OUTLN', 'XS$NULL', 'FLOWS_FILES', 'MDSYS', 'CTXSYS', 'XDB', 'HR' )`
USERNAME NOT IN ( 'SYS', 'SYSTEM', 'ANONYMOUS', 'APEX_PUBLIC_USER', 'APEX_040000', 'OUTLN', 'XS$NULL', 'FLOWS_FILES', 'MDSYS', 'CTXSYS', 'XDB', 'HR' )`, asOfSCN)

rows, err := o.MetaDataConn.QueryContext(context.TODO(), query)
if err != nil {
Expand All @@ -163,11 +174,16 @@ func (o *OracleDB) GetSchemas() ([]string, error) {
}

func (o *OracleDB) GetColumns(schema, table string) ([]string, error) {
asOfSCN := ""
// if o.SCN != 0 {
// asOfSCN = fmt.Sprintf("AS OF SCN %d", o.SCN)
// }
query := fmt.Sprintf(`SELECT column_name
FROM all_tab_cols
%s
WHERE table_name = '%s'
AND owner = '%s'
ORDER BY COLUMN_ID`, table, schema)
ORDER BY COLUMN_ID`, asOfSCN, table, schema)

rows, err := o.MetaDataConn.QueryContext(context.TODO(), query)
if err != nil {
Expand Down Expand Up @@ -201,3 +217,32 @@ SELECT dbms_metadata.get_ddl('TABLE','%s','%s') FROM dual`, table, schema))
}
return query, nil
}

func (o *OracleDB) NewTx(ctx context.Context) (*sql.Tx, error) {
tx, err := o._db.BeginTx(ctx, &sql.TxOptions{})
if err != nil {
return nil, err
}
return tx, nil
}

func (o *OracleDB) GetCurrentSnapshotSCN() (int64, error) {
var globalSCN int64
// 获取当前 SCN 号
err := o.MetaDataConn.QueryRowContext(context.TODO(), "SELECT CURRENT_SCN FROM V$DATABASE").Scan(&globalSCN)
if err != nil {
return 0, err
}
return globalSCN, nil
}

func (o *OracleDB) InitSCN(scn int64) (err error) {
if scn == 0 {
scn, err = o.GetCurrentSnapshotSCN()
if err != nil {
return err
}
}
o.SCN = scn
return nil
}
60 changes: 53 additions & 7 deletions driver/oracle/extractor/extractor_oracle.go
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,8 @@
package extractor

import (
"context"
"database/sql"
gosql "database/sql"
"encoding/binary"
"fmt"
Expand Down Expand Up @@ -408,6 +410,10 @@ func (e *ExtractorOracle) Finish1() (err error) {
}

func (e *ExtractorOracle) getSchemaTablesAndMeta() error {
err := e.oracleDB.InitSCN(e.mysqlContext.OracleConfig.Scn)
if err != nil {
return err
}
if err := e.inspectTables(); err != nil {
return err
}
Expand Down Expand Up @@ -864,22 +870,35 @@ func (e *ExtractorOracle) CheckAndApplyLowerCaseTableNames() {
}

func (e *ExtractorOracle) oracleDump() error {
// step 1 : todo lock row
// query : lock table schema.table in row share mode;
if err := e.getSchemaTablesAndMeta(); err != nil {
e.onError(common.TaskStateDead, err)
return err
}

// step 2 : get current scn for d.Dump()
currentSCN, err := (&LogMinerStream{oracleDB: e.oracleDB}).GetCurrentSnapshotSCN()
// step 1 : lock table schema.table in row share mode;
tx, err := e.oracleDB.NewTx(context.TODO())
if err != nil {
e.onError(common.TaskStateDead, err)
return err
}

// step 3 : defer unlock row
err = e.LockTablesForSchema(tx, context.TODO())
if err != nil {
e.onError(common.TaskStateDead, err)
return err
}
defer func() {
if tx != nil {
tx.Rollback()
}
}()
// step 2 : get current scn for d.Dump()
// currentSCN, err := e.oracleDB.GetCurrentSnapshotSCN()
// if err != nil {
// return err
// }

// step 4 : create table ddl
// step 3 : create table ddl
if !e.mysqlContext.SkipCreateDbTable {
e.logger.Info("generating DROP and CREATE statements to reflect current database schemas",
"replicateDoDb", e.replicateDoDb)
Expand Down Expand Up @@ -931,11 +950,17 @@ func (e *ExtractorOracle) oracleDump() error {
}
}
}

// step 4: rollback for unlock table
if tx != nil {
tx.Rollback()
}

// step 5: Dump all of the tables and generate source records ...
// todo need merged dumper with mysql dumper
for _, db := range e.replicateDoDb {
for _, t := range db.Tables {
d := NewDumper(e.oracleDB, t, e.mysqlContext.ChunkSize, e.logger.ResetNamed("dumper"), e.memory1, currentSCN)
d := NewDumper(e.oracleDB, t, e.mysqlContext.ChunkSize, e.logger.ResetNamed("dumper"), e.memory1, e.oracleDB.SCN)
if err := d.Dump(); err != nil {
e.onError(common.TaskStateDead, err)
}
Expand Down Expand Up @@ -971,3 +996,24 @@ func (e *ExtractorOracle) encodeAndSendDumpEntry(entry *common.DumpEntry) error
}
return nil
}

func (e *ExtractorOracle) LockTablesForSchema(tx *sql.Tx, ctx context.Context) error {
for _, db := range e.replicateDoDb {
for _, table := range db.Tables {
query := fmt.Sprintf("LOCK TABLE %s.%s IN ROW SHARE MODE", db.TableSchema, table.TableName)
_, err := tx.Exec(query)
if err != nil {
return err
}
}
}
return nil
}

func releaseSchemaSnapshotLock(tx *sql.Tx) {
// roll back connect
for err := tx.Rollback(); err != nil; {
// log roll back failed
continue
}
}
14 changes: 2 additions & 12 deletions driver/oracle/extractor/log_miner.go
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Original file line number Diff line number Diff line change
Expand Up @@ -28,16 +28,6 @@ import (
"github.com/thinkeridea/go-extend/exbytes"
)

func (l *LogMinerStream) GetCurrentSnapshotSCN() (int64, error) {
var globalSCN int64
// 获取当前 SCN 号
err := l.oracleDB.LogMinerConn.QueryRowContext(context.TODO(), "SELECT CURRENT_SCN FROM V$DATABASE").Scan(&globalSCN)
if err != nil {
return 0, err
}
return globalSCN, nil
}

type LogFile struct {
Name string
FirstChange int64
Expand Down Expand Up @@ -532,7 +522,7 @@ func (e *ExtractorOracle) DataStreamEvents(entriesChannel chan<- *common.EntryCo
e.logger.Debug("start oracle. DataStreamEvents")

if e.LogMinerStream.startScn == 0 {
scn, err := e.LogMinerStream.GetCurrentSnapshotSCN()
scn, err := e.LogMinerStream.oracleDB.GetCurrentSnapshotSCN()
if err != nil {
e.logger.Error("GetCurrentSnapshotSCN", "err", err)
return err
Expand Down Expand Up @@ -726,7 +716,7 @@ func (l *LogMinerStream) stopLogMiner() error {
//}

func (l *LogMinerStream) getEndScn() (int64, error) {
latestScn, err := l.GetCurrentSnapshotSCN()
latestScn, err := l.oracleDB.GetCurrentSnapshotSCN()
if err != nil {
l.logger.Error("GetCurrentSnapshotSCN", "err", err)
return 0, err
Expand Down